From: Ashishkumar Parmar <[email protected]> This patch applies the upstream Samba security backport for CVE-2026-4408. The upstream security bundle is referenced in [1], and the public CVE advisory is referenced in [2]. The individual backported commit links are recorded in the embedded patch headers.
Only the CVE-2026-4408-relevant commits from [1] are backported: [PATCH 11/31] through [PATCH 21/31] and [PATCH 25/31] through [PATCH 31/31]. The remaining bundle commits are intentionally omitted because they fix separate CVEs: CVE-2026-1933, CVE-2026-2340, CVE-2026-3012, CVE-2026-3238, and CVE-2026-4480-only changes. [1] https://www.samba.org/samba/ftp/patches/security/samba-4.22.9-security-2026-05-25.patch [2] https://www.samba.org/samba/security/CVE-2026-4408.html Signed-off-by: Ashishkumar Parmar <[email protected]> --- .../samba/samba/CVE-2026-4408_p1.patch | 75 ++ .../samba/samba/CVE-2026-4408_p10.patch | 339 +++++ .../samba/samba/CVE-2026-4408_p11.patch | 94 ++ .../samba/samba/CVE-2026-4408_p12.patch | 47 + .../samba/samba/CVE-2026-4408_p13.patch | 174 +++ .../samba/samba/CVE-2026-4408_p14.patch | 59 + .../samba/samba/CVE-2026-4408_p15.patch | 1108 +++++++++++++++++ .../samba/samba/CVE-2026-4408_p16.patch | 422 +++++++ .../samba/samba/CVE-2026-4408_p17.patch | 55 + .../samba/samba/CVE-2026-4408_p18.patch | 52 + .../samba/samba/CVE-2026-4408_p2.patch | 133 ++ .../samba/samba/CVE-2026-4408_p3.patch | 208 ++++ .../samba/samba/CVE-2026-4408_p4.patch | 179 +++ .../samba/samba/CVE-2026-4408_p5.patch | 46 + .../samba/samba/CVE-2026-4408_p6.patch | 131 ++ .../samba/samba/CVE-2026-4408_p7.patch | 84 ++ .../samba/samba/CVE-2026-4408_p8.patch | 39 + .../samba/samba/CVE-2026-4408_p9.patch | 61 + .../samba/samba_4.19.9.bb | 18 + 19 files changed, 3324 insertions(+) create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p1.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p10.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p11.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p12.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p13.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p14.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p15.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p16.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p17.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p18.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p2.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p3.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p4.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p5.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p6.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p7.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p8.patch create mode 100644 meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p9.patch diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p1.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p1.patch new file mode 100644 index 0000000000..2ca29b2f9e --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p1.patch @@ -0,0 +1,75 @@ +From 26b64ec55944b375ead223a214c5f4301329511f Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 23 Apr 2026 18:20:15 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: inline + string_sub2() into string_sub() the only caller + +This will simplify further changes. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/26b64ec55944b375ead223a214c5f4301329511f] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 26b64ec55944b375ead223a214c5f4301329511f) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/substitute.c | 20 ++------------------ + 1 file changed, 2 insertions(+), 18 deletions(-) + +diff --git a/lib/util/substitute.c b/lib/util/substitute.c +index b7b5588da863..26362ca77b2c 100644 +--- a/lib/util/substitute.c ++++ b/lib/util/substitute.c +@@ -47,10 +47,9 @@ + use of len==0 which was for no length checks to be done. + **/ + +-static void string_sub2(char *s,const char *pattern, const char *insert, size_t len, +- bool remove_unsafe_characters, bool replace_once, +- bool allow_trailing_dollar) ++void string_sub(char *s, const char *pattern, const char *insert, size_t len) + { ++ bool remove_unsafe_characters = true; + char *p; + size_t ls, lp, li, i; + +@@ -79,13 +78,6 @@ static void string_sub2(char *s,const char *pattern, const char *insert, size_t + for (i=0;i<li;i++) { + switch (insert[i]) { + case '$': +- /* allow a trailing $ +- * (as in machine accounts) */ +- if (allow_trailing_dollar && (i == li - 1 )) { +- p[i] = insert[i]; +- break; +- } +- FALL_THROUGH; + case '`': + case '"': + case '\'': +@@ -107,17 +99,9 @@ static void string_sub2(char *s,const char *pattern, const char *insert, size_t + } + s = p + li; + ls = ls + li - lp; +- +- if (replace_once) +- break; + } + } + +-void string_sub(char *s,const char *pattern, const char *insert, size_t len) +-{ +- string_sub2( s, pattern, insert, len, true, false, false ); +-} +- + /** + Similar to string_sub() but allows for any character to be substituted. + Use with caution! +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p10.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p10.patch new file mode 100644 index 0000000000..a5a4d00801 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p10.patch @@ -0,0 +1,339 @@ +From d291377ac1ea515ac064ac00d59e1787db5671d1 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 7 May 2026 18:10:50 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: add + talloc_string_sub_{mixed_quoting,unsafe}() helpers + +This is the basic helper function for the security problems. + +talloc_string_sub_mixed_quoting() checks for strange quoting +in smb.conf options. + +And talloc_string_sub_unsafe() tries to autodetect how the unsafe +(client controlled value) and masked and single quote it, +as a fallback for strange quoting a fixed fallback string +is used and the caller should warn the admin and give +hints how to fix the configuration. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +Pair-Programmed-With: Douglas Bagnall <[email protected]> + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/d291377ac1ea515ac064ac00d59e1787db5671d1] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Signed-off-by: Douglas Bagnall <[email protected]> +(cherry picked from commit d291377ac1ea515ac064ac00d59e1787db5671d1) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/substitute.c | 260 ++++++++++++++++++++++++++++++++++++++++++ + lib/util/substitute.h | 17 +++ + 2 files changed, 277 insertions(+) + +diff --git a/lib/util/substitute.c b/lib/util/substitute.c +index 30989927da72..406d8424be1a 100644 +--- a/lib/util/substitute.c ++++ b/lib/util/substitute.c +@@ -25,6 +25,8 @@ + #include "system/locale.h" + #include "debug.h" + #ifndef SAMBA_UTIL_CORE_ONLY ++#include "lib/util/fault.h" ++#include "lib/util/talloc_stack.h" + #include "charset/charset.h" + #else + #include "charset_compat.h" +@@ -297,3 +299,261 @@ char *talloc_all_string_sub(TALLOC_CTX *ctx, + return talloc_string_sub2(ctx, src, pattern, insert, + false, false, false); + } ++ ++#ifndef SAMBA_UTIL_CORE_ONLY ++ ++bool talloc_string_sub_mixed_quoting(const char *full_cmd, char variable_char) ++{ ++ /* ++ * Try to make sure talloc_string_sub_unsafe() ++ * won't return NULL, instead talloc_stackframe_pool() ++ * would panic ++ */ ++ size_t cmd_len = full_cmd != NULL ? strlen(full_cmd) : 0; ++ size_t pool_size = 512 + cmd_len; ++ TALLOC_CTX *frame = talloc_stackframe_pool(pool_size); ++ char *cmd = NULL; ++ bool modified = false; ++ bool masked = false; ++ bool mixed_fallback = false; ++ ++ cmd = talloc_string_sub_unsafe(frame, ++ full_cmd, ++ variable_char, ++ "U", /* unsafe_value */ ++ "'\"%", /* unsafe_characters */ ++ '_', /* safe_character */ ++ "F", /* fallback_value */ ++ &modified, ++ &masked, ++ &mixed_fallback); ++ if (cmd == NULL) { ++ mixed_fallback = false; ++ } ++ TALLOC_FREE(frame); ++ return mixed_fallback; ++} ++ ++char *talloc_string_sub_unsafe(TALLOC_CTX *mem_ctx, ++ const char *orig_cmd, ++ char variable_char, ++ const char *unsafe_value, ++ const char *unsafe_characters, ++ char safe_character, ++ const char *fallback_value, ++ bool *_modified, ++ bool *_masked, ++ bool *_mixed_fallback) ++{ ++ TALLOC_CTX *frame = talloc_stackframe(); ++ const char variable[3] = ++ { '%', variable_char, '\0' }; ++ const char variable_s_quoted[5] = ++ { '\'', '%', variable_char, '\'', '\0' }; ++ const char variable_d_quoted[5] = ++ { '"', '%', variable_char, '"', '\0' }; ++ char *cmd = NULL; ++ char *masked_value = NULL; ++ char *quoted_value = NULL; ++ bool has_s_quotes; ++ bool has_d_quotes; ++ bool has_variable; ++ bool has_variable_s_quoted; ++ bool has_variable_d_quoted; ++ bool modified = false; ++ bool masked = false; ++ bool mixed_fallback = false; ++ bool ok; ++ ++ /* ++ * The unsafe_characters argument should contain ++ * single and double quotes. ++ * Otherwise We can't safely handle this. ++ */ ++ SMB_ASSERT(unsafe_characters != NULL); ++ SMB_ASSERT(strchr(unsafe_characters, '\'') != NULL); ++ SMB_ASSERT(strchr(unsafe_characters, '"') != NULL); ++ SMB_ASSERT(strchr(unsafe_characters, '%') != NULL); ++ ++ cmd = talloc_strdup(mem_ctx, orig_cmd); ++ if (cmd == NULL) { ++ TALLOC_FREE(frame); ++ return NULL; ++ } ++ cmd = talloc_steal(frame, cmd); ++ ++ has_variable = strstr(orig_cmd, variable) != NULL; ++ if (!has_variable) { ++ /* ++ * Nothing to do... ++ */ ++ goto done; ++ } ++ modified = true; ++ ++ /* ++ * Replace all unsafe characters as well as control ++ * characters. ++ * ++ * Note that we start with masked_value = "%u" ++ * and then replace "%u" with unsafe_value, ++ * as a result we have a masked version of ++ * unsafe_value. ++ * ++ * And don't allow option injected like ++ * ++ * '-h value' ++ * '--help value' ++ * ++ */ ++ masked_value = talloc_strdup(frame, variable); ++ if (masked_value == NULL) { ++ goto nomem; ++ } ++ ok = realloc_string_sub_raw(&masked_value, ++ variable, ++ unsafe_value, ++ false, /* replace_once */ ++ false, /* allow_trailing_dollar */ ++ unsafe_characters, ++ safe_character); ++ if (!ok) { ++ goto nomem; ++ } ++ if (masked_value[0] == '-') { ++ masked_value[0] = safe_character; ++ } ++ masked = strcmp(masked_value, unsafe_value) != 0; ++ ++retry: ++ ++ has_s_quotes = strchr(cmd, '\'') != NULL; ++ has_d_quotes = strchr(cmd, '"') != NULL; ++ has_variable = strstr(cmd, variable) != NULL; ++ has_variable_s_quoted = strstr(cmd, variable_s_quoted) != NULL; ++ has_variable_d_quoted = strstr(cmd, variable_d_quoted) != NULL; ++ ++ if (has_variable_s_quoted) { ++ /* ++ * In smb.conf we have something like ++ * ++ * some script = /usr/bin/script '%u' ++ * ++ * It is safe to replace '%u' (or '%J' etc, depending ++ * on variable_char) with '<masked_value>' if ++ * masked_value does not contain single quotes. We ++ * have checked that. ++ */ ++ ++ if (quoted_value == NULL) { ++ quoted_value = talloc_asprintf(frame, "'%s'", ++ masked_value); ++ if (quoted_value == NULL) { ++ goto nomem; ++ } ++ } ++ ++ ok = realloc_string_sub_raw(&cmd, ++ variable_s_quoted, ++ quoted_value, ++ false, /* replace_once */ ++ false, /* allow_trailing_dollar */ ++ NULL, /* unsafe_characters */ ++ '\0'); /* safe_character */ ++ if (!ok) { ++ goto nomem; ++ } ++ ++ goto retry; ++ } ++ ++ if (has_variable_d_quoted && !has_s_quotes) { ++ /* ++ * replace the "%u" ++ * ++ * some script = /usr/bin/script "%u" ++ * ++ * with '%u' and try the '%u' -> 'variable' substitution ++ * again. ++ */ ++ ++ ok = realloc_string_sub_raw(&cmd, ++ variable_d_quoted, ++ variable_s_quoted, ++ false, /* replace_once */ ++ false, /* allow_trailing_dollar */ ++ NULL, /* unsafe_characters */ ++ '\0'); /* safe_character */ ++ if (!ok) { ++ goto nomem; ++ } ++ ++ goto retry; ++ } ++ ++ if (has_variable && !has_s_quotes && !has_d_quotes) { ++ /* ++ * In this case: ++ * ++ * some script = /usr/bin/script %u ++ * ++ * we can safely substitute %u -> '%u' and try the ++ * single quote test again. ++ */ ++ ++ ok = realloc_string_sub_raw(&cmd, ++ variable, ++ variable_s_quoted, ++ false, /* replace_once */ ++ false, /* allow_trailing_dollar */ ++ NULL, /* unsafe_characters */ ++ '\0'); /* safe_character */ ++ if (!ok) { ++ goto nomem; ++ } ++ ++ goto retry; ++ } ++ ++ if (has_variable) { ++ /* ++ * There are single or double quotes, but not tightly ++ * bound around a %u. ++ * ++ * Or there's a mix of single and double quotes. ++ * ++ * We just use a generic fallback value. ++ * and let the caller warn about this ++ * and give the admin a hind to fix the smb.conf ++ * option. ++ */ ++ mixed_fallback = true; ++ ++ ok = realloc_string_sub_raw(&cmd, ++ variable, ++ fallback_value, ++ false, /* replace_once */ ++ false, /* allow_trailing_dollar */ ++ NULL, /* unsafe_characters */ ++ '\0'); /* safe_character */ ++ if (!ok) { ++ goto nomem; ++ } ++ } ++ ++done: ++ *_modified = modified; ++ *_masked = masked; ++ *_mixed_fallback = mixed_fallback; ++ cmd = talloc_steal(mem_ctx, cmd); ++ TALLOC_FREE(frame); ++ return cmd; ++ ++nomem: ++ *_modified = false; ++ *_masked = false; ++ *_mixed_fallback = false; ++ TALLOC_FREE(frame); ++ return NULL; ++} ++#endif /* ! SAMBA_UTIL_CORE_ONLY */ +diff --git a/lib/util/substitute.h b/lib/util/substitute.h +index 41f56c73ba2c..b8205055da1e 100644 +--- a/lib/util/substitute.h ++++ b/lib/util/substitute.h +@@ -83,4 +83,21 @@ char *talloc_all_string_sub(TALLOC_CTX *ctx, + const char *src, + const char *pattern, + const char *insert); ++ ++#ifndef SAMBA_UTIL_CORE_ONLY ++bool talloc_string_sub_mixed_quoting(const char *full_cmd, char variable_char); ++ ++char *talloc_string_sub_unsafe(TALLOC_CTX *mem_ctx, ++ const char *orig_cmd, ++ char variable_char, ++ const char *unsafe_value, ++ const char *unsafe_characters, ++ char safe_character, ++ const char *fallback_value, ++ bool *_modified, ++ bool *_masked, ++ bool *_mixed_fallback); ++ ++#endif /* ! SAMBA_UTIL_CORE_ONLY */ ++ + #endif /* _SAMBA_SUBSTITUTE_H_ */ +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p11.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p11.patch new file mode 100644 index 0000000000..66df884afb --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p11.patch @@ -0,0 +1,94 @@ +From 6dce1833a5d27f82a9b133601ce7f749f3be08ec Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 23 Apr 2026 18:56:21 +0200 +Subject: [PATCH] CVE-2026-4408: lib/util: introduce + strstr_for_invalid_account_characters() + +This splits out the logic from samaccountname_bad_chars_check() +in source4/dsdb/samdb/ldb_modules/samldb.c, this will be used +in other places soon. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/6dce1833a5d27f82a9b133601ce7f749f3be08ec] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 6dce1833a5d27f82a9b133601ce7f749f3be08ec) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/samba_util.h | 9 +++++++++ + lib/util/util_str.c | 38 ++++++++++++++++++++++++++++++++++++++ + 2 files changed, 47 insertions(+) + +diff --git a/lib/util/samba_util.h b/lib/util/samba_util.h +index 03dee5c61379..ea741b51c58f 100644 +--- a/lib/util/samba_util.h ++++ b/lib/util/samba_util.h +@@ -303,6 +303,15 @@ _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean); + */ + _PUBLIC_ bool conv_str_bool(const char * str, bool * val); + ++/** ++ * Returns a pointer to the first invalid character in name. ++ * ++ * Passing a NULL pointer as name is not allowed! ++ * ++ * This returns NULL for a valid account name. ++ **/ ++_PUBLIC_ const char *strstr_for_invalid_account_characters(const char *name); ++ + /** + * Convert a size specification like 16K into an integral number of bytes. + **/ +diff --git a/lib/util/util_str.c b/lib/util/util_str.c +index 7c1d15dbeb0b..c4eda4f49f38 100644 +--- a/lib/util/util_str.c ++++ b/lib/util/util_str.c +@@ -305,3 +305,41 @@ _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean) + } + return false; + } ++ ++_PUBLIC_ const char *strstr_for_invalid_account_characters(const char *name) ++{ ++ /* ++ * Return a pointer to the first invalid character in the ++ * sAMAccountName, or NULL if the whole name is valid. ++ * ++ * The rules here are based on ++ * ++ * https://social.technet.microsoft.com/wiki/contents/articles/11216.active-directory-requirements-for-creating-objects.aspx ++ */ ++ size_t i; ++ ++ for (i = 0; name[i] != '\0'; i++) { ++ uint8_t c = name[i]; ++ const char *p = NULL; ++ ++ if (iscntrl(c)) { ++ return &name[i]; ++ } ++ ++ p = strchr("\"[]:;|=+*?<>/\\,", c); ++ if (p != NULL) { ++ return &name[i]; ++ } ++ } ++ ++ if (i == 0) { ++ return &name[i]; ++ } ++ ++ if (name[i - 1] == '.') { ++ i -= 1; ++ return &name[i]; ++ } ++ ++ return NULL; ++} +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p12.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p12.patch new file mode 100644 index 0000000000..f6ed00649c --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p12.patch @@ -0,0 +1,47 @@ +From 8f28ca0b8abccf30f479133cc78f9a72500ab366 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Mon, 11 May 2026 20:21:36 +0200 +Subject: [PATCH] CVE-2026-4408: s3:samr-server: only allow + _samr_ValidatePassword as DC + +This is only supported with 'rpc start on demand helpers = no', +as it needs ncacn_ip_tcp, but we better also restrict it to DCs. + +Maybe only FreeIPA needs it as NT4 didn't support ncacn_ip_tcp. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/8f28ca0b8abccf30f479133cc78f9a72500ab366] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 8f28ca0b8abccf30f479133cc78f9a72500ab366) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + source3/rpc_server/samr/srv_samr_nt.c | 8 ++++++++ + 1 file changed, 8 insertions(+) + +diff --git a/source3/rpc_server/samr/srv_samr_nt.c b/source3/rpc_server/samr/srv_samr_nt.c +index e0d0875bd5da..3937dbe3f32e 100644 +--- a/source3/rpc_server/samr/srv_samr_nt.c ++++ b/source3/rpc_server/samr/srv_samr_nt.c +@@ -7500,6 +7500,14 @@ NTSTATUS _samr_ValidatePassword(struct pipes_struct *p, + return NT_STATUS_ACCESS_DENIED; + } + ++ if (lp_server_role() <= ROLE_DOMAIN_MEMBER) { ++ /* ++ * We only want this on DCs ++ */ ++ p->fault_state = DCERPC_FAULT_ACCESS_DENIED; ++ return NT_STATUS_ACCESS_DENIED; ++ } ++ + if (r->in.level < 1 || r->in.level > 3) { + return NT_STATUS_INVALID_INFO_CLASS; + } +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p13.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p13.patch new file mode 100644 index 0000000000..bd5b24497d --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p13.patch @@ -0,0 +1,174 @@ +From 1c5146ddfc736e9d790bd91f3124c6fba6847bb3 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Wed, 18 Mar 2026 12:24:47 +0100 +Subject: [PATCH] CVE-2026-4408: s3:samr-server: deny, mask and/or single + quote username to 'check password script' + +We pass this on to the check password script, prevent remote command +execution. + +We now try to autodetect if we could implicitly use '%u' for the +replacement and fallback to a fixed fallback username. + +Admins should make use of SAMBA_CPS_ACCOUNT_NAME +instead of passing '%u' to 'check password script' + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +Pair-Programmed-With: Douglas Bagnall <[email protected]> + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/1c5146ddfc736e9d790bd91f3124c6fba6847bb3] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Signed-off-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 1c5146ddfc736e9d790bd91f3124c6fba6847bb3) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + source3/rpc_server/samr/srv_samr_chgpasswd.c | 110 +++++++++++++++++-- + 1 file changed, 101 insertions(+), 9 deletions(-) + +diff --git a/source3/rpc_server/samr/srv_samr_chgpasswd.c b/source3/rpc_server/samr/srv_samr_chgpasswd.c +index 6c0c0da0cfc3..9afb8799aea0 100644 +--- a/source3/rpc_server/samr/srv_samr_chgpasswd.c ++++ b/source3/rpc_server/samr/srv_samr_chgpasswd.c +@@ -54,6 +54,7 @@ + #include "passdb.h" + #include "auth.h" + #include "lib/util/sys_rw.h" ++#include "lib/util/util_str_escape.h" + #include "librpc/rpc/dcerpc_samr.h" + + #include "lib/crypto/gnutls_helpers.h" +@@ -1008,27 +1009,118 @@ static bool check_passwd_history(struct samu *sampass, const char *plaintext) + /*********************************************************** + ************************************************************/ + ++static NTSTATUS check_password_complexity_internal(TALLOC_CTX *tosctx, ++ const char *orig_cmd, ++ const char *username, ++ char **cmd_out) ++{ ++ const char *fallback_username = "__CVE-2026-4408_FallbackUsername__"; ++ const char *inv = NULL; ++ char *cmd = NULL; ++ bool modified = false; ++ bool masked = false; ++ bool mixed_fallback = false; ++ ++ *cmd_out = NULL; ++ ++ if (username == NULL) { ++ return NT_STATUS_INVALID_USER_PRINCIPAL_NAME; ++ } ++ ++ /* ++ * This catches invalid characters in account names ++ * which might be problematic passing to a shell script. ++ */ ++ inv = strstr_for_invalid_account_characters(username); ++ if (inv != NULL) { ++ char *le_username = log_escape(tosctx, username); ++ ++ DBG_WARNING("username '%s' has invalid or dangerous characters\n", ++ le_username); ++ ++ TALLOC_FREE(le_username); ++ ++ return NT_STATUS_INVALID_USER_PRINCIPAL_NAME; ++ } ++ ++ /* ++ * This masks the remaining unsafe characters which ++ * are not already caught by strstr_for_invalid_account_characters() ++ * with '_'. ++ * ++ * Then it replaces %u with an single quoted ++ * and/or shell escaped version of the masked username. ++ */ ++ cmd = talloc_string_sub_unsafe(tosctx, ++ orig_cmd, ++ 'u', ++ username, ++ STRING_SUB_UNSAFE_CHARACTERS, ++ '_', ++ fallback_username, ++ &modified, ++ &masked, ++ &mixed_fallback); ++ if (cmd == NULL) { ++ return NT_STATUS_NO_MEMORY; ++ } ++ ++ /* ++ * Now warn about unexpected values ++ */ ++ ++ if (mixed_fallback) { ++ D_WARNING("CVE-2026-4408: " ++ "strange quoting in 'check password script', " ++ "falling back to replace %%u with %s, " ++ "use testparm to fix the configuration\n", ++ fallback_username); ++ D_WARNING("CVE-2026-4408: " ++ "You should use '%%u', or SAMBA_CPS_ACCOUNT_NAME " ++ "inside of 'check password script'.\n"); ++ } else if (masked) { ++ char *le_username = log_escape(tosctx, username); ++ ++ D_WARNING("CVE-2026-4408: " ++ "replaced %%u with masked value instead of: %s\n", ++ le_username); ++ D_WARNING("CVE-2026-4408: " ++ "You should use SAMBA_CPS_ACCOUNT_NAME inside " ++ "'check password script' instead of %%u.\n"); ++ ++ TALLOC_FREE(le_username); ++ } ++ ++ *cmd_out = cmd; ++ return NT_STATUS_OK; ++} ++ ++ + NTSTATUS check_password_complexity(const char *username, + const char *fullname, + const char *password, + enum samPwdChangeReason *samr_reject_reason) + { ++ int check_ret; ++ NTSTATUS status; + TALLOC_CTX *tosctx = talloc_tos(); + const struct loadparm_substitution *lp_sub = + loadparm_s3_global_substitution(); +- int check_ret; +- char *cmd; ++ const char *orig_cmd = NULL; ++ char *cmd = NULL; + +- /* Use external script to check password complexity */ +- if ((lp_check_password_script(tosctx, lp_sub) == NULL) +- || (*(lp_check_password_script(tosctx, lp_sub)) == '\0')){ ++ orig_cmd = lp_check_password_script(tosctx, lp_sub); ++ if (orig_cmd == NULL || orig_cmd[0] == '\0') { + return NT_STATUS_OK; + } + +- cmd = talloc_string_sub(tosctx, lp_check_password_script(tosctx, lp_sub), "%u", +- username); +- if (!cmd) { +- return NT_STATUS_PASSWORD_RESTRICTION; ++ /* note we don't use 'fullname' or 'password' here */ ++ status = check_password_complexity_internal(tosctx, ++ orig_cmd, ++ username, ++ &cmd); ++ if (!NT_STATUS_IS_OK(status)) { ++ return status; + } + + check_ret = setenv("SAMBA_CPS_ACCOUNT_NAME", username, 1); +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p14.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p14.patch new file mode 100644 index 0000000000..c9c19b9688 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p14.patch @@ -0,0 +1,59 @@ +From 67ad724e22f3724d5e07eaa8f25eb527aa417599 Mon Sep 17 00:00:00 2001 +From: Douglas Bagnall <[email protected]> +Date: Sat, 2 May 2026 22:12:38 +1200 +Subject: [PATCH] CVE-2026-4408: s3:samr-server: make + check_password_complexity_internal() non-static, for easier testing + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/67ad724e22f3724d5e07eaa8f25eb527aa417599] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 67ad724e22f3724d5e07eaa8f25eb527aa417599) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + source3/rpc_server/samr/srv_samr_chgpasswd.c | 8 ++++---- + source3/rpc_server/samr/srv_samr_util.h | 5 +++++ + 2 files changed, 9 insertions(+), 4 deletions(-) + +diff --git a/source3/rpc_server/samr/srv_samr_chgpasswd.c b/source3/rpc_server/samr/srv_samr_chgpasswd.c +index 9afb8799aea0..3f48da47a5bd 100644 +--- a/source3/rpc_server/samr/srv_samr_chgpasswd.c ++++ b/source3/rpc_server/samr/srv_samr_chgpasswd.c +@@ -1009,10 +1009,10 @@ static bool check_passwd_history(struct samu *sampass, const char *plaintext) + /*********************************************************** + ************************************************************/ + +-static NTSTATUS check_password_complexity_internal(TALLOC_CTX *tosctx, +- const char *orig_cmd, +- const char *username, +- char **cmd_out) ++NTSTATUS check_password_complexity_internal(TALLOC_CTX *tosctx, ++ const char *orig_cmd, ++ const char *username, ++ char **cmd_out) + { + const char *fallback_username = "__CVE-2026-4408_FallbackUsername__"; + const char *inv = NULL; +diff --git a/source3/rpc_server/samr/srv_samr_util.h b/source3/rpc_server/samr/srv_samr_util.h +index 5e839ac77c01..a3a22012858b 100644 +--- a/source3/rpc_server/samr/srv_samr_util.h ++++ b/source3/rpc_server/samr/srv_samr_util.h +@@ -79,6 +79,11 @@ NTSTATUS pass_oem_change(char *user, const char *rhost, + uchar password_encrypted_with_nt_hash[516], + const uchar old_nt_hash_encrypted[16], + enum samPwdChangeReason *reject_reason); ++ ++NTSTATUS check_password_complexity_internal(TALLOC_CTX *mem_ctx, ++ const char *_orig_cmd, ++ const char *username, ++ char **cmd_out); + NTSTATUS check_password_complexity(const char *username, + const char *fullname, + const char *password, +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p15.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p15.patch new file mode 100644 index 0000000000..4abaf3aeca --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p15.patch @@ -0,0 +1,1108 @@ +From ebd4edda32d949e10e531939b7a4e19b2306ff64 Mon Sep 17 00:00:00 2001 +From: Douglas Bagnall <[email protected]> +Date: Sat, 9 May 2026 22:02:47 +1200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: add + test_string_sub unittests + +This demonstrates the logic of talloc_string_sub_{mixed_quoting,unsafe}() + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/ebd4edda32d949e10e531939b7a4e19b2306ff64] + +Pair-Programmed-With: Stefan Metzmacher <[email protected]> + +Signed-off-by: Douglas Bagnall <[email protected]> +Signed-off-by: Stefan Metzmacher <[email protected]> +(cherry picked from commit ebd4edda32d949e10e531939b7a4e19b2306ff64) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/tests/test_string_sub.c | 1044 ++++++++++++++++++++++++++++++ + lib/util/wscript_build | 6 + + selftest/tests.py | 2 + + 3 files changed, 1052 insertions(+) + create mode 100644 lib/util/tests/test_string_sub.c + +diff --git a/lib/util/tests/test_string_sub.c b/lib/util/tests/test_string_sub.c +new file mode 100644 +index 000000000000..da97c1c936ca +--- /dev/null ++++ b/lib/util/tests/test_string_sub.c +@@ -0,0 +1,1044 @@ ++ ++#include <stdarg.h> ++#include <stddef.h> ++#include <stdint.h> ++#include <setjmp.h> ++#include <sys/stat.h> ++#include "replace.h" ++#include <cmocka.h> ++#include "talloc.h" ++ ++#include "../substitute.h" ++ ++/* set _DEBUG_VERBOSE to print more. */ ++#define _DEBUG_VERBOSE ++ ++#ifdef _DEBUG_VERBOSE ++#define debug_message(...) print_message(__VA_ARGS__) ++#else ++#define debug_message(...) /* debug_message */ ++#endif ++ ++ ++static int setup_talloc_context(void **state) ++{ ++ TALLOC_CTX *mem_ctx = talloc_new(NULL); ++ *state = mem_ctx; ++ return 0; ++} ++ ++static int teardown_talloc_context(void **state) ++{ ++ TALLOC_CTX *mem_ctx = *state; ++ TALLOC_FREE(mem_ctx); ++ return 0; ++} ++ ++struct cmd_expansion { ++ const char *lp_cmd; ++ const char *username; ++ const char *result_cmd; ++ bool modified; ++ bool masked; ++ bool mixed_fallback; ++}; ++ ++static void _test_talloc_string_sub_unsafe(void **state, ++ struct cmd_expansion expansions[], ++ size_t n_expansions, ++ const char *unsafe_characters) ++{ ++ TALLOC_CTX *mem_ctx = *state; ++ size_t i; ++ ++ for (i = 0; i < n_expansions; i++) { ++ struct cmd_expansion t = expansions[i]; ++ char *result_cmd = NULL; ++ bool masked; ++ bool mixed_fallback; ++ bool modified; ++ bool flags_correct; ++ bool mixed; ++ int cmp; ++ ++ mixed = talloc_string_sub_mixed_quoting(t.lp_cmd, 'u'); ++ ++ result_cmd = talloc_string_sub_unsafe(mem_ctx, ++ t.lp_cmd, ++ 'u', ++ t.username, ++ unsafe_characters, ++ '_', ++ "FallbackUsername", ++ &modified, ++ &masked, ++ &mixed_fallback); ++ assert_ptr_not_equal(result_cmd, NULL); ++ assert_ptr_not_equal(t.result_cmd, NULL); ++ ++ cmp = strcmp(t.result_cmd, result_cmd); ++ flags_correct = (modified == t.modified && ++ masked == t.masked && ++ mixed_fallback == t.mixed_fallback); ++ ++ if (cmp == 0) { ++ debug_message("[%zu] «%s» «%s» -> «%s»; AS EXPECTED\n", ++ i, t.lp_cmd, ++ t.username, ++ result_cmd); ++ } else { ++ debug_message("[%zu] «%s» «%s»; " ++ "expected [%zu] «%s» got [%zu] «%s»\033[1;31m BAD! \033[0m\n", ++ i, t.lp_cmd, ++ t.username, ++ strlen(t.result_cmd), t.result_cmd, ++ strlen(result_cmd), result_cmd); ++ } ++ assert_int_equal(cmp, 0); ++ if (!flags_correct) { ++ debug_message("[%zu] ", i); ++#define _FLAG(x) debug_message((t. x == x) ? "%s: %s √; ": \ ++ "%s \033[1;31m expected %s \033[0m; ", \ ++ #x, t.x ? "true": "false"); ++ _FLAG(modified); ++ _FLAG(masked); ++ _FLAG(mixed_fallback); ++ debug_message("\n"); ++ } ++ assert_int_equal(flags_correct, true); ++ if (mixed_fallback != mixed) { ++ debug_message("[%zu] %s mixed \033[1;31m expected %s \033[0m; ", ++ i, t.lp_cmd, ++ mixed_fallback ? "true": "false"); ++ } ++ assert_int_equal(mixed_fallback, mixed); ++#undef _FLAG ++ } ++ debug_message("ALL correct\n"); ++} ++ ++static void test_talloc_string_sub_unsafe(void **state) ++{ ++ const char *unsafe_characters = STRING_SUB_UNSAFE_CHARACTERS; ++ ++ static struct cmd_expansion expansions[] = { ++ { ++ "/bin/echo \"bob'", ++ "bob", ++ "/bin/echo \"bob'", ++ false, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "bob", ++ "/bin/echo 'bob'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob", ++ "/bin/echo 'bob'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob'", ++ "/bin/echo 'bob_'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob'''", ++ "/bin/echo 'bob___'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob\'", ++ "/bin/echo 'bob_'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo '%u", ++ "bob bob bob", ++ "/bin/echo 'FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo \"%u\"", ++ " ", ++ "/bin/echo ' '", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob", ++ "/bin/echo \"--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob !0", ++ "/bin/echo \"--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo %u", ++ "!0", ++ "/bin/echo '!0'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob \\", ++ "/bin/echo \"--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "bob >> x", ++ "/bin/echo --uu='bob __ x'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo '--uu=%u\"", ++ "bob", ++ "/bin/echo '--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "bob", ++ "/bin/echo --uu='bob'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo --uu'=%u'", ++ "bob", ++ "/bin/echo --uu'=FallbackUsername'", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu'=%u'", ++ "`ls`", ++ "/bin/echo --uu'=FallbackUsername'", ++ true, ++ true, ++ true, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "u%u%u%u%u", ++ "/bin/echo --uu='u_u_u_u_u'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "$(ls)", ++ "/bin/echo --uu='_(ls)'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "`ls`", ++ "/bin/echo --uu='_ls_'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo --uu='1' %u", ++ "`ls`", ++ "/bin/echo --uu='1' FallbackUsername", ++ true, ++ true, ++ true, ++ }, ++ { ++ "/bin/echo --uu=\"'%u'\"", ++ "bob", ++ "/bin/echo --uu=\"'bob'\"", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo --uu='%u' --yy='%u' '%u' %u", ++ "bob", ++ "/bin/echo --uu='bob' --yy='bob' 'bob' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu=%u%u%u'' %user 50%u", ++ "bob", ++ "/bin/echo --uu=FallbackUsernameFallbackUsernameFallbackUsername'' FallbackUsernameser 50FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo %u", ++ "!!", ++ "/bin/echo '!!'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ ">xxx", ++ "/bin/echo '_xxx'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "3", ++ "/bin/echo '3'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "3$", ++ "/bin/echo '3_'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "comp$", ++ "/bin/echo 'comp_'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "3$3", ++ "/bin/echo '3_3'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "q $3", ++ "/bin/echo 'q _3'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo '%u", ++ "q $3", ++ "/bin/echo 'FallbackUsername", ++ true, ++ true, ++ true, ++ }, ++ { ++ "/bin/echo -s '%u' %u", ++ "āāā", ++ "/bin/echo -s 'āāā' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo -s '%u' %u", ++ "-āāā", ++ "/bin/echo -s '_āāā' FallbackUsername", ++ true, ++ true, ++ true, ++ }, ++ { ++ "/bin/echo -s %u", ++ "āāā", ++ "/bin/echo -s 'āāā'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo -s %u", ++ "a -a", ++ "/bin/echo -s 'a -a'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo -s=%u %u", ++ "ā -a", ++ "/bin/echo -s='ā -a' 'ā -a'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo -s=\"%u %u\"", ++ "ā -a", ++ "/bin/echo -s=\"FallbackUsername FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo -m='fridge' %u", ++ "ā -ß", ++ "/bin/echo -m='fridge' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo -m='fridge' %u", ++ "-ā -a", ++ "/bin/echo -m='fridge' FallbackUsername", ++ true, ++ true, ++ true, ++ }, ++ { ++ "/bin/echo %u", ++ "-n", ++ "/bin/echo '_n'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "o'clock", ++ "/bin/echo 'o_clock'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo \"bob'", ++ "bob", ++ "/bin/echo \"bob'", ++ false, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"%u\"", ++ "%u", ++ "/bin/echo '_u'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo \"$(ls)\"", ++ "%u", ++ "/bin/echo \"$(ls)\"", ++ false, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "\\", ++ "/bin/echo '\\'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "\\", ++ "/bin/echo '\\'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"%u\"", ++ "\\", ++ "/bin/echo '\\'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"%u\" %u", ++ "\\", ++ "/bin/echo '\\' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo '%u' \"%u\" %u", ++ "\\", ++ "/bin/echo '\\' \"FallbackUsername\" FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo '%u' \"%u\"", ++ "bob", ++ "/bin/echo 'bob' \"FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ }; ++ ++ _test_talloc_string_sub_unsafe(state, ++ expansions, ++ ARRAY_SIZE(expansions), ++ unsafe_characters); ++} ++ ++static void test_talloc_string_sub_unsafe_minimal_unsafe_chars(void **state) ++{ ++ const char *unsafe_characters = "\"'%"; ++ ++ static struct cmd_expansion expansions[] = { ++ { ++ "/bin/echo \"bob'", ++ "bob", ++ "/bin/echo \"bob'", ++ false, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "bob", ++ "/bin/echo 'bob'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob", ++ "/bin/echo 'bob'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob'", ++ "/bin/echo 'bob_'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob'''", ++ "/bin/echo 'bob___'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "bob\'", ++ "/bin/echo 'bob_'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo '%u", ++ "bob bob bob", ++ "/bin/echo 'FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo \"%u\"", ++ " ", ++ "/bin/echo ' '", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob", ++ "/bin/echo \"--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob !0", ++ "/bin/echo \"--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo %u", ++ "!0", ++ "/bin/echo '!0'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob \\", ++ "/bin/echo \"--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "bob >> x", ++ "/bin/echo --uu='bob >> x'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '--uu=%u\"", ++ "bob", ++ "/bin/echo '--uu=FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "bob", ++ "/bin/echo --uu='bob'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo --uu'=%u'", ++ "bob", ++ "/bin/echo --uu'=FallbackUsername'", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu'=%u'", ++ "`ls`", ++ "/bin/echo --uu'=FallbackUsername'", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "u%u%u%u%u", ++ "/bin/echo --uu='u_u_u_u_u'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "$(ls)", ++ "/bin/echo --uu='$(ls)'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "`ls`", ++ "/bin/echo --uu='`ls`'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo --uu='1' %u", ++ "`ls`", ++ "/bin/echo --uu='1' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu=\"'%u'\"", ++ "bob", ++ "/bin/echo --uu=\"'bob'\"", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo --uu='%u' --yy='%u' '%u' %u", ++ "bob", ++ "/bin/echo --uu='bob' --yy='bob' 'bob' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo --uu=%u%u%u'' %user 50%u", ++ "bob", ++ "/bin/echo --uu=FallbackUsernameFallbackUsernameFallbackUsername'' FallbackUsernameser 50FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo %u", ++ "!!", ++ "/bin/echo '!!'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ ">xxx", ++ "/bin/echo '>xxx'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "3", ++ "/bin/echo '3'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "3$", ++ "/bin/echo '3$'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "comp$", ++ "/bin/echo 'comp$'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "3$3", ++ "/bin/echo '3$3'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "q $3", ++ "/bin/echo 'q $3'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u", ++ "q $3", ++ "/bin/echo 'FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo -s '%u' %u", ++ "āāā", ++ "/bin/echo -s 'āāā' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo -s '%u' %u", ++ "-āāā", ++ "/bin/echo -s '_āāā' FallbackUsername", ++ true, ++ true, ++ true, ++ }, ++ { ++ "/bin/echo -s %u", ++ "āāā", ++ "/bin/echo -s 'āāā'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo -s %u", ++ "a -a", ++ "/bin/echo -s 'a -a'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo -s=%u %u", ++ "ā -a", ++ "/bin/echo -s='ā -a' 'ā -a'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo -s=\"%u %u\"", ++ "ā -a", ++ "/bin/echo -s=\"FallbackUsername FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo -m='fridge' %u", ++ "ā -ß", ++ "/bin/echo -m='fridge' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo -m='fridge' %u", ++ "-ā -a", ++ "/bin/echo -m='fridge' FallbackUsername", ++ true, ++ true, ++ true, ++ }, ++ { ++ "/bin/echo %u", ++ "-n", ++ "/bin/echo '_n'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "o'clock", ++ "/bin/echo 'o_clock'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo \"bob'", ++ "bob", ++ "/bin/echo \"bob'", ++ false, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"%u\"", ++ "%u", ++ "/bin/echo '_u'", ++ true, ++ true, ++ false, ++ }, ++ { ++ "/bin/echo \"$(ls)\"", ++ "%u", ++ "/bin/echo \"$(ls)\"", ++ false, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo %u", ++ "\\", ++ "/bin/echo '\\'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo '%u'", ++ "\\", ++ "/bin/echo '\\'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"%u\"", ++ "\\", ++ "/bin/echo '\\'", ++ true, ++ false, ++ false, ++ }, ++ { ++ "/bin/echo \"%u\" %u", ++ "\\", ++ "/bin/echo '\\' FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo '%u' \"%u\" %u", ++ "\\", ++ "/bin/echo '\\' \"FallbackUsername\" FallbackUsername", ++ true, ++ false, ++ true, ++ }, ++ { ++ "/bin/echo '%u' \"%u\"", ++ "bob", ++ "/bin/echo 'bob' \"FallbackUsername\"", ++ true, ++ false, ++ true, ++ }, ++ }; ++ ++ _test_talloc_string_sub_unsafe(state, ++ expansions, ++ ARRAY_SIZE(expansions), ++ unsafe_characters); ++} ++ ++static void test_talloc_string_sub_unsafe_all_mixes(void **state) ++{ ++ const char *unsafe_characters = STRING_SUB_UNSAFE_CHARACTERS; ++ size_t i; ++ ++ for (i = 0; i < 32; i++) { ++ char in[100] = { 0, }; ++ char out[100] = { 0, }; ++ struct cmd_expansion expansions[] = { ++ { ++ in, ++ "bob", ++ out, ++ true, ++ false, ++ false, ++ }, ++ }; ++ bool vsq = i & 1; ++ bool vdq = i & 2; ++ bool v = i & 4; ++ bool sq = i & 8; ++ bool dq = i & 16; ++ char *inp = in; ++ char *outp = out; ++ if (vsq) { ++ inp = stpcpy(inp, "'%u' "); ++ outp = stpcpy(outp, "'bob' "); ++ debug_message("vsq "); ++ } ++ if (vdq) { ++ inp = stpcpy(inp, "\"%u\" "); ++ outp = stpcpy(outp, (vsq || sq) ? "\"FallbackUsername\" " : "'bob' "); ++ debug_message("vdq "); ++ if (vsq || sq) { ++ expansions[0].mixed_fallback = true; ++ } ++ } ++ if (v) { ++ inp = stpcpy(inp, "%u "); ++ outp = stpcpy(outp, (vsq || vdq || sq || dq) ? "FallbackUsername " : "'bob' "); ++ debug_message("v "); ++ if (vsq || vdq || sq || dq) { ++ expansions[0].mixed_fallback = true; ++ } ++ } ++ if (sq) { ++ inp = stpcpy(inp, "' "); ++ outp = stpcpy(outp, "' "); ++ debug_message("sq "); ++ } ++ if (dq) { ++ inp = stpcpy(inp, "\" "); ++ outp = stpcpy(outp, "\" "); ++ debug_message("dq "); ++ } ++ debug_message("(i: %zu)\n", i); ++ *inp = '\0'; ++ *outp = '\0'; ++ expansions[0].modified = strcmp(in, out) != 0; ++ ++ _test_talloc_string_sub_unsafe(state, ++ expansions, ++ ARRAY_SIZE(expansions), ++ unsafe_characters); ++ } ++} ++ ++ ++int main(void) ++{ ++ const struct CMUnitTest tests[] = { ++ cmocka_unit_test(test_talloc_string_sub_unsafe), ++ cmocka_unit_test(test_talloc_string_sub_unsafe_minimal_unsafe_chars), ++ cmocka_unit_test(test_talloc_string_sub_unsafe_all_mixes), ++ }; ++ if (!isatty(1)) { ++ cmocka_set_message_output(CM_OUTPUT_SUBUNIT); ++ } ++ return cmocka_run_group_tests(tests, ++ setup_talloc_context, ++ teardown_talloc_context); ++} +diff --git a/lib/util/wscript_build b/lib/util/wscript_build +index 9dff0e8925db..c9c04f1aaed3 100644 +--- a/lib/util/wscript_build ++++ b/lib/util/wscript_build +@@ -420,3 +420,9 @@ else: + deps='cmocka replace talloc stable_sort', + local_include=False, + for_selftest=True) ++ ++ bld.SAMBA3_BINARY('test_string_sub', ++ source='tests/test_string_sub.c', ++ deps='''cmocka replace talloc samba-util ++ ''', ++ for_selftest=True) +diff --git a/selftest/tests.py b/selftest/tests.py +index 534612296449..71634191dd15 100644 +--- a/selftest/tests.py ++++ b/selftest/tests.py +@@ -559,6 +559,8 @@ plantestsuite("samba.unittests.sys_rw", "none", + [os.path.join(bindir(), "default/lib/util/test_sys_rw")]) + plantestsuite("samba.unittests.stable_sort", "none", + [os.path.join(bindir(), "default/lib/util/test_stable_sort")]) ++plantestsuite("samba.unittests.test_string_sub", "none", ++ [os.path.join(bindir(), "test_string_sub")]) + plantestsuite("samba.unittests.ntlm_check", "none", + [os.path.join(bindir(), "default/libcli/auth/test_ntlm_check")]) + plantestsuite("samba.unittests.gnutls", "none", +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p16.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p16.patch new file mode 100644 index 0000000000..f168941250 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p16.patch @@ -0,0 +1,422 @@ +From 266cd3dc063fdb88a0d0468e8d6f85d6abdecc04 Mon Sep 17 00:00:00 2001 +From: Douglas Bagnall <[email protected]> +Date: Sat, 2 May 2026 22:14:43 +1200 +Subject: [PATCH] CVE-2026-4408: s3:torture: tests for password + complexity scripts + +This tries to demonstrate the new logic for %u in +'check password script'. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/266cd3dc063fdb88a0d0468e8d6f85d6abdecc04] + +Pair-Programmed-With: Stefan Metzmacher <[email protected]> + +Signed-off-by: Douglas Bagnall <[email protected]> +Signed-off-by: Stefan Metzmacher <[email protected]> +(cherry picked from commit 266cd3dc063fdb88a0d0468e8d6f85d6abdecc04) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + selftest/tests.py | 2 + + source3/torture/test_rpc_samr.c | 358 ++++++++++++++++++++++++++++++++ + source3/torture/wscript_build | 6 + + 3 files changed, 366 insertions(+) + create mode 100644 source3/torture/test_rpc_samr.c + +diff --git a/selftest/tests.py b/selftest/tests.py +index 71634191dd15..817c19aa1249 100644 +--- a/selftest/tests.py ++++ b/selftest/tests.py +@@ -575,6 +575,8 @@ plantestsuite("samba.unittests.test_oLschema2ldif", "none", + [os.path.join(bindir(), "default/source4/utils/oLschema2ldif/test_oLschema2ldif")]) + plantestsuite("samba.unittests.auth.sam", "none", + [os.path.join(bindir(), "test_auth_sam")]) ++plantestsuite("samba.unittests.test_rpc_samr", "none", ++ [os.path.join(bindir(), "test_rpc_samr")]) + if have_heimdal_support and not using_system_gssapi: + plantestsuite("samba.unittests.auth.heimdal_gensec_unwrap_des", "none", + [valgrindify(os.path.join(bindir(), "test_heimdal_gensec_unwrap_des"))]) +diff --git a/source3/torture/test_rpc_samr.c b/source3/torture/test_rpc_samr.c +new file mode 100644 +index 000000000000..8d4f39852462 +--- /dev/null ++++ b/source3/torture/test_rpc_samr.c +@@ -0,0 +1,358 @@ ++ ++#include <stdarg.h> ++#include <stddef.h> ++#include <stdint.h> ++#include <setjmp.h> ++#include <sys/stat.h> ++#include <cmocka.h> ++#include "includes.h" ++#include "talloc.h" ++#include "libcli/util/ntstatus.h" ++#include "../librpc/gen_ndr/samr.h" ++#include "rpc_server/samr/srv_samr_util.h" ++ ++/* set SAMR_DEBUG_VERBOSE to true to print more. */ ++#define SAMR_DEBUG_VERBOSE true ++ ++#if SAMR_DEBUG_VERBOSE ++#define debug_message(...) print_message(__VA_ARGS__) ++#else ++#define debug_message(...) /* debug_message */ ++#endif ++ ++static int setup_talloc_context(void **state) ++{ ++ TALLOC_CTX *mem_ctx = talloc_new(NULL); ++ *state = mem_ctx; ++ return 0; ++} ++ ++static int teardown_talloc_context(void **state) ++{ ++ TALLOC_CTX *mem_ctx = *state; ++ TALLOC_FREE(mem_ctx); ++ return 0; ++} ++ ++struct cmd_expansion { ++ const char *lp_cmd; ++ const char *username; ++ const char *result_cmd; ++ NTSTATUS result_code; ++}; ++ ++static struct cmd_expansion expansions[] = { ++ { ++ "/bin/echo '%u'", ++ "bob", ++ "/bin/echo 'bob'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "bob", ++ "/bin/echo 'bob'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "bob'", ++ "/bin/echo 'bob_'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "bob\'", ++ "/bin/echo 'bob_'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "bob'''", ++ "/bin/echo 'bob___'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "bob*", ++ NULL, ++ NT_STATUS_INVALID_USER_PRINCIPAL_NAME ++ }, ++ { ++ "/bin/echo %u", ++ "bob\"", ++ NULL, ++ NT_STATUS_INVALID_USER_PRINCIPAL_NAME ++ }, ++ { ++ "/bin/echo '%u", ++ "bob bob bob", ++ "/bin/echo '__CVE-2026-4408_FallbackUsername__", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo \"%u\"", ++ " ", ++ "/bin/echo ' '", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob", ++ "/bin/echo \"--uu=__CVE-2026-4408_FallbackUsername__\"", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob !0", ++ "/bin/echo \"--uu=__CVE-2026-4408_FallbackUsername__\"", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "!0", ++ "/bin/echo '!0'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo \"--uu=%u\"", ++ "bob \\", ++ NULL, ++ NT_STATUS_INVALID_USER_PRINCIPAL_NAME ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "bob >> x", ++ NULL, ++ NT_STATUS_INVALID_USER_PRINCIPAL_NAME ++ }, ++ { ++ "/bin/echo '--uu=%u\"", ++ "bob", ++ "/bin/echo '--uu=__CVE-2026-4408_FallbackUsername__\"", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "bob", ++ "/bin/echo --uu='bob'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu'=%u'", ++ "bob", ++ "/bin/echo --uu'=__CVE-2026-4408_FallbackUsername__'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu'=%u'", ++ "`ls`", ++ "/bin/echo --uu'=__CVE-2026-4408_FallbackUsername__'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu'=%u'", ++ "$(ls)", ++ "/bin/echo --uu'=__CVE-2026-4408_FallbackUsername__'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu='%u'", ++ "$(ls)", ++ "/bin/echo --uu='_(ls)'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu=\"'%u'\"", ++ "bob", ++ "/bin/echo --uu=\"'bob'\"", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu='%u' --yy='%u' '%u' %u", ++ "bob", ++ "/bin/echo --uu='bob' --yy='bob' 'bob' __CVE-2026-4408_FallbackUsername__", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo --uu=%u%u'' %user 50%u", ++ "bob", ++ "/bin/echo --uu=__CVE-2026-4408_FallbackUsername____CVE-2026-4408_FallbackUsername__'' __CVE-2026-4408_FallbackUsername__ser 50__CVE-2026-4408_FallbackUsername__", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "!!", ++ "/bin/echo '!!'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ ">xxx", ++ NULL, ++ NT_STATUS_INVALID_USER_PRINCIPAL_NAME ++ }, ++ { ++ "/bin/echo %u", ++ "\\", ++ NULL, ++ NT_STATUS_INVALID_USER_PRINCIPAL_NAME ++ }, ++ { ++ "/bin/echo %u", ++ "3", ++ "/bin/echo '3'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo '%u'", ++ "3$", ++ "/bin/echo '3_'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo '%u'", ++ "comp$", ++ "/bin/echo 'comp_'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo '%u'", ++ "3$3", ++ "/bin/echo '3_3'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo '%u'", ++ "q $3", ++ "/bin/echo 'q _3'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -s '%u' %u", ++ "āāā", ++ "/bin/echo -s 'āāā' __CVE-2026-4408_FallbackUsername__", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -s '%u' %u", ++ "-āāā", ++ "/bin/echo -s '_āāā' __CVE-2026-4408_FallbackUsername__", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -s %u", ++ "āāā", ++ "/bin/echo -s 'āāā'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -s %u", ++ "a -a", ++ "/bin/echo -s 'a -a'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -s=%u %u", ++ "ā -a", ++ "/bin/echo -s='ā -a' 'ā -a'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -s=\"%u %u\"", ++ "ā -a", ++ "/bin/echo -s=\"__CVE-2026-4408_FallbackUsername__ __CVE-2026-4408_FallbackUsername__\"", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -m='fridge' %u", ++ "ā -x -ß", ++ "/bin/echo -m='fridge' __CVE-2026-4408_FallbackUsername__", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo -m='fridge' %u", ++ "-ā -a", ++ "/bin/echo -m='fridge' __CVE-2026-4408_FallbackUsername__", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "-n", ++ "/bin/echo '_n'", ++ NT_STATUS_OK ++ }, ++ { ++ "/bin/echo %u", ++ "o'clock", ++ "/bin/echo 'o_clock'", ++ NT_STATUS_OK ++ }, ++}; ++ ++static void test_expansions(void **state) ++{ ++ TALLOC_CTX *mem_ctx = *state; ++ size_t i; ++ ++ for (i = 0; i < ARRAY_SIZE(expansions); i++) { ++ struct cmd_expansion t = expansions[i]; ++ char *result_cmd = NULL; ++ NTSTATUS status; ++ ++ status = check_password_complexity_internal(mem_ctx, ++ t.lp_cmd, ++ t.username, ++ &result_cmd); ++ if (NT_STATUS_IS_OK(t.result_code) && NT_STATUS_IS_OK(status)) { ++ int cmp; ++ ++ cmp = strcmp(t.result_cmd, result_cmd); ++ if (cmp == 0) { ++ debug_message("[%zu] «%s» «%s» -> «%s», nstatus %s; AS EXPECTED\n", ++ i, t.lp_cmd, ++ t.username, ++ result_cmd, ++ nt_errstr(status)); ++ } else { ++ debug_message("[%zu] «%s» «%s», nstatus %s; " ++ "expected «%s» got «%s»\033[1;31m BAD! \033[0m\n", ++ i, t.lp_cmd, ++ t.username, ++ nt_errstr(status), ++ t.result_cmd, ++ result_cmd); ++ } ++ assert_int_equal(cmp, 0); ++ } else if (NT_STATUS_EQUAL(status, t.result_code)) { ++ debug_message("[%zu] «%s» «%s», nstatus %s FAILED AS EXPECTED\n", ++ i, t.lp_cmd, ++ t.username, ++ nt_errstr(status)); ++ } else { ++ debug_message("[%zu] «%s» «%s» -> «%s», nstatus %s; " ++ "EXPECTED result «%s» ntstatus %s; \033[1;31m BAD! \033[0m\n", ++ i, t.lp_cmd, ++ t.username, ++ result_cmd, ++ nt_errstr(status), ++ t.result_cmd, ++ nt_errstr(t.result_code)); ++ assert_int_equal(true, false); ++ } ++ } ++ debug_message("ALL correct\n"); ++} ++ ++int main(void) ++{ ++ const struct CMUnitTest tests[] = { ++ cmocka_unit_test(test_expansions), ++ }; ++ if (!isatty(1)) { ++ cmocka_set_message_output(CM_OUTPUT_SUBUNIT); ++ } ++ return cmocka_run_group_tests(tests, ++ setup_talloc_context, ++ teardown_talloc_context); ++} +diff --git a/source3/torture/wscript_build b/source3/torture/wscript_build +index 1d2520099e35..d04008b3df17 100644 +--- a/source3/torture/wscript_build ++++ b/source3/torture/wscript_build +@@ -133,3 +133,9 @@ bld.SAMBA3_BINARY('vfstest', + SMBREADLINE + ''', + for_selftest=True) ++ ++bld.SAMBA3_BINARY('test_rpc_samr', ++ source='test_rpc_samr.c', ++ deps='''RPC_SERVICE cmocka ++ ''', ++ for_selftest=True) +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p17.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p17.patch new file mode 100644 index 0000000000..4fe1194d41 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p17.patch @@ -0,0 +1,55 @@ +From 65a9ac413b03eefc7a48d5536e54177319ca30e3 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Fri, 8 May 2026 23:27:35 +0200 +Subject: [PATCH] CVE-2026-4408: s3:testparm: warn about 'check password + script' %u usage + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/65a9ac413b03eefc7a48d5536e54177319ca30e3] + +Backport Changes: +- Adjusted context for Samba 4.19.9 do_global_checks() because the + surrounding global-check order differs from the upstream 4.22 patch. + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 65a9ac413b03eefc7a48d5536e54177319ca30e3) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + source3/utils/testparm.c | 13 +++++++++++++ + 1 file changed, 13 insertions(+) + +diff --git a/source3/utils/testparm.c b/source3/utils/testparm.c +index 02280595d2a0..1a6eb93a2e6d 100644 +--- a/source3/utils/testparm.c ++++ b/source3/utils/testparm.c +@@ -277,6 +277,7 @@ static int do_global_checks(void) + const char *socket_options; + const struct loadparm_substitution *lp_sub = + loadparm_s3_global_substitution(); ++ const char *check_pw_script = NULL; + + fprintf(stderr, "\n"); + +@@ -699,6 +700,17 @@ static int do_global_checks(void) + "CVE-2022-37966\n\n"); + } + ++ check_pw_script = lp_check_password_script(talloc_tos(), lp_sub); ++ if (talloc_string_sub_mixed_quoting(check_pw_script, 'u')) { ++ fprintf(stderr, ++ "WARNING: You are using 'check password script' " ++ "with mixed quoting and %%u.\n" ++ "CVE-2026-4408 changed the way %%u substitution works. \n" ++ "You should use the SAMBA_CPS_ACCOUNT_NAME " ++ "environment variable exported to the script, or\n" ++ "at least use single quotes (directly) around '%%u'.\n\n"); ++ } ++ + return ret; + } + +-- +2.43.0 diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p18.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p18.patch new file mode 100644 index 0000000000..012ac6d06e --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p18.patch @@ -0,0 +1,52 @@ +From 640f18d1a642264a9777f933dfaae78db6918a5f Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Mon, 11 May 2026 13:52:52 +0200 +Subject: [PATCH] CVE-2026-4408: docs-xml/smbdotconf: clarify '%u' in + 'check password script' + +Admins should use SAMBA_CPS_ACCOUNT_NAME. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/640f18d1a642264a9777f933dfaae78db6918a5f] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 640f18d1a642264a9777f933dfaae78db6918a5f) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + docs-xml/smbdotconf/security/checkpasswordscript.xml | 10 ++++++++-- + 1 file changed, 8 insertions(+), 2 deletions(-) + +diff --git a/docs-xml/smbdotconf/security/checkpasswordscript.xml b/docs-xml/smbdotconf/security/checkpasswordscript.xml +index 18aa2c6d290e..dd162d89f08a 100644 +--- a/docs-xml/smbdotconf/security/checkpasswordscript.xml ++++ b/docs-xml/smbdotconf/security/checkpasswordscript.xml +@@ -20,8 +20,8 @@ + + <itemizedlist> + <listitem><para> +- SAMBA_CPS_ACCOUNT_NAME is always present and contains the sAMAccountName of user, +- the is the same as the %u substitutions in the none AD DC case. ++ SAMBA_CPS_ACCOUNT_NAME is always present and contains the sAMAccountName of user. ++ It is the same as the '%u' substitutions in the non AD DC case. + </para></listitem> + + <listitem><para> +@@ -33,6 +33,12 @@ + </para></listitem> + </itemizedlist> + ++ <para>Even on a non AD DC SAMBA_CPS_ACCOUNT_NAME is the preferred way to access the ++ account name, as it contains the raw value provided by the client. If that's not ++ possible you should use single quotes (directly) around %u, e.g. /path/to/somescript '%u', ++ see CVE-2026-4408 for more details. ++ </para> ++ + <para>Note: In the example directory is a sample program called <command moreinfo="none">crackcheck</command> + that uses cracklib to check the password quality.</para> + +-- +2.43.0 + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p2.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p2.patch new file mode 100644 index 0000000000..acfb0cce28 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p2.patch @@ -0,0 +1,133 @@ +From 76dcb30911c22d92ca79e9034656b691a2d51df4 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 23 Apr 2026 18:20:15 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: remove unused + talloc_strdup(insert) from talloc_string_sub2() + +The insert string is not modified, so we do not need to copy it. + +This will simplify further changes. + +Review with: git show --patience + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/76dcb30911c22d92ca79e9034656b691a2d51df4] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 76dcb30911c22d92ca79e9034656b691a2d51df4) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/substitute.c | 57 +++++++++++++++++++------------------------ + 1 file changed, 25 insertions(+), 32 deletions(-) + +diff --git a/lib/util/substitute.c b/lib/util/substitute.c +index 26362ca77b2c..4a0c58ab3a7f 100644 +--- a/lib/util/substitute.c ++++ b/lib/util/substitute.c +@@ -157,7 +157,7 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + bool replace_once, + bool allow_trailing_dollar) + { +- char *p, *in; ++ char *p; + char *s; + char *string; + ssize_t ls,lp,li,ld, i; +@@ -175,22 +175,32 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + + s = string; + +- in = talloc_strdup(mem_ctx, insert); +- if (!in) { +- DEBUG(0, ("talloc_string_sub2: ENOMEM\n")); +- talloc_free(string); +- return NULL; +- } + ls = (ssize_t)strlen(s); + lp = (ssize_t)strlen(pattern); + li = (ssize_t)strlen(insert); + ld = li - lp; + +- for (i=0;i<li;i++) { +- switch (in[i]) { ++ while ((p = strstr_m(s,pattern))) { ++ if (ld > 0) { ++ int offset = PTR_DIFF(s,string); ++ string = (char *)talloc_realloc_size(mem_ctx, string, ++ ls + ld + 1); ++ if (!string) { ++ DEBUG(0, ("talloc_string_sub: out of " ++ "memory!\n")); ++ return NULL; ++ } ++ p = string + offset + (p - s); ++ } ++ if (li != lp) { ++ memmove(p+li,p+lp,strlen(p+lp)+1); ++ } ++ for (i=0; i<li; i++) { ++ switch (insert[i]) { + case '$': +- /* allow a trailing $ +- * (as in machine accounts) */ ++ /* ++ * allow a trailing $ (as in machine accounts) ++ */ + if (allow_trailing_dollar && (i == li - 1 )) { + break; + } +@@ -204,34 +214,18 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + case '\r': + case '\n': + if (remove_unsafe_characters) { +- in[i] = '_'; +- break; ++ p[i] = '_'; ++ continue; + } + + FALL_THROUGH; + default: + /* ok */ + break; +- } +- } +- +- while ((p = strstr_m(s,pattern))) { +- if (ld > 0) { +- int offset = PTR_DIFF(s,string); +- string = (char *)talloc_realloc_size(mem_ctx, string, +- ls + ld + 1); +- if (!string) { +- DEBUG(0, ("talloc_string_sub: out of " +- "memory!\n")); +- TALLOC_FREE(in); +- return NULL; + } +- p = string + offset + (p - s); +- } +- if (li != lp) { +- memmove(p+li,p+lp,strlen(p+lp)+1); ++ ++ p[i] = insert[i]; + } +- memcpy(p, in, li); + s = p + li; + ls += ld; + +@@ -239,7 +233,6 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + break; + } + } +- TALLOC_FREE(in); + return string; + } + +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p3.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p3.patch new file mode 100644 index 0000000000..1a92409ce9 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p3.patch @@ -0,0 +1,208 @@ +From 3032b7efe9d2fd35081ec33d575d01f9ebf6725c Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 23 Apr 2026 18:20:15 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: factor out a + mask_unsafe_character() helper function + +This moves the logic into a single place and +makes if more flexible to be used with more +values than STRING_SUB_UNSAFE_CHARACTERS. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/3032b7efe9d2fd35081ec33d575d01f9ebf6725c] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 3032b7efe9d2fd35081ec33d575d01f9ebf6725c) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/substitute.c | 109 +++++++++++++++++++++--------------------- + lib/util/substitute.h | 6 ++- + 2 files changed, 60 insertions(+), 55 deletions(-) + +diff --git a/lib/util/substitute.c b/lib/util/substitute.c +index 4a0c58ab3a7f..b9fe32e993ec 100644 +--- a/lib/util/substitute.c ++++ b/lib/util/substitute.c +@@ -35,6 +35,33 @@ + * @brief Substitute utilities. + **/ + ++static inline ++char mask_unsafe_character(char in, ++ bool is_last, ++ bool allow_trailing_dollar, ++ const char *unsafe_characters, ++ char safe_out) ++{ ++ const char *unsafe = NULL; ++ ++ if (unsafe_characters == NULL) { ++ return in; ++ } ++ ++ /* allow a trailing $ (as in machine accounts) */ ++ if (allow_trailing_dollar && is_last && in == '$') { ++ return in; ++ } ++ ++ unsafe = strchr(unsafe_characters, in); ++ if (unsafe != NULL) { ++ return safe_out; ++ } ++ ++ /* ok */ ++ return in; ++} ++ + /** + Substitute a string for a pattern in another string. Make sure there is + enough room! +@@ -42,14 +69,16 @@ + This routine looks for pattern in s and replaces it with + insert. It may do multiple replacements or just one. + +- Any of " ; ' $ or ` in the insert string are replaced with _ ++ Any of STRING_SUB_UNSAFE_CHARACTERS in the insert string are replaced with _ ++ + if len==0 then the string cannot be extended. This is different from the old + use of len==0 which was for no length checks to be done. + **/ + + void string_sub(char *s, const char *pattern, const char *insert, size_t len) + { +- bool remove_unsafe_characters = true; ++ const char *unsafe_characters = STRING_SUB_UNSAFE_CHARACTERS; ++ char safe_character = '_'; + char *p; + size_t ls, lp, li, i; + +@@ -76,26 +105,18 @@ void string_sub(char *s, const char *pattern, const char *insert, size_t len) + memmove(p+li,p+lp,strlen(p+lp)+1); + } + for (i=0;i<li;i++) { +- switch (insert[i]) { +- case '$': +- case '`': +- case '"': +- case '\'': +- case ';': +- case '%': +- case '\r': +- case '\n': +- if ( remove_unsafe_characters ) { +- p[i] = '_'; +- /* yes this break should be here +- * since we want to fall throw if +- * not replacing unsafe chars */ +- break; +- } +- FALL_THROUGH; +- default: +- p[i] = insert[i]; +- } ++ /* ++ * Without allow_trailing_dollar we don't ++ * need to calculate is_last... ++ */ ++ const bool is_last = false; ++ const bool allow_trailing_dollar = false; ++ ++ p[i] = mask_unsafe_character(insert[i], ++ is_last, ++ allow_trailing_dollar, ++ unsafe_characters, ++ safe_character); + } + s = p + li; + ls = ls + li - lp; +@@ -157,9 +178,11 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + bool replace_once, + bool allow_trailing_dollar) + { +- char *p; +- char *s; +- char *string; ++ const char *unsafe_characters = STRING_SUB_UNSAFE_CHARACTERS; ++ const char safe_character = '_'; ++ char *p = NULL, ++ char *s = NULL; ++ char *string = NULL; + ssize_t ls,lp,li,ld, i; + + if (!insert || !pattern || !*pattern || !src) { +@@ -195,36 +218,14 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + if (li != lp) { + memmove(p+li,p+lp,strlen(p+lp)+1); + } +- for (i=0; i<li; i++) { +- switch (insert[i]) { +- case '$': +- /* +- * allow a trailing $ (as in machine accounts) +- */ +- if (allow_trailing_dollar && (i == li - 1 )) { +- break; +- } +- +- FALL_THROUGH; +- case '`': +- case '"': +- case '\'': +- case ';': +- case '%': +- case '\r': +- case '\n': +- if (remove_unsafe_characters) { +- p[i] = '_'; +- continue; +- } +- +- FALL_THROUGH; +- default: +- /* ok */ +- break; +- } ++ for (i=0; i < li; i++) { ++ bool is_last = (i == li - 1); + +- p[i] = insert[i]; ++ p[i] = mask_unsafe_character(insert[i], ++ is_last, ++ allow_trailing_dollar, ++ unsafe_characters, ++ safe_character); + } + s = p + li; + ls += ld; +diff --git a/lib/util/substitute.h b/lib/util/substitute.h +index 3134cfcdea54..e1a82859daca 100644 +--- a/lib/util/substitute.h ++++ b/lib/util/substitute.h +@@ -26,6 +26,8 @@ + + #include <talloc.h> + ++#define STRING_SUB_UNSAFE_CHARACTERS "$`\"';%\r\n" ++ + /** + Substitute a string for a pattern in another string. Make sure there is + enough room! +@@ -33,7 +35,9 @@ + This routine looks for pattern in s and replaces it with + insert. It may do multiple replacements. + +- Any of " ; ' $ or ` in the insert string are replaced with _ ++ Any of STRING_SUB_UNSAFE_CHARACTERS (see above) in the ++ insert string are replaced with _ ++ + if len==0 then the string cannot be extended. This is different from the old + use of len==0 which was for no length checks to be done. + **/ +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p4.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p4.patch new file mode 100644 index 0000000000..d68964ca75 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p4.patch @@ -0,0 +1,179 @@ +From 3f24236a5000402de11d973527eb7d28fd30de19 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 30 Apr 2026 14:48:26 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: split out + realloc_string_sub_raw() + +This will allow realloc_string_sub2() to use it in order +to have the logic in one place only. + +And it will also allow adjacted callers to be +more flexible. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/3f24236a5000402de11d973527eb7d28fd30de19] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 3f24236a5000402de11d973527eb7d28fd30de19) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/substitute.c | 85 ++++++++++++++++++++++++++++++------------- + lib/util/substitute.h | 18 +++++++++ + 2 files changed, 78 insertions(+), 25 deletions(-) + +diff --git a/lib/util/substitute.c b/lib/util/substitute.c +index b9fe32e993ec..465aea866055 100644 +--- a/lib/util/substitute.c ++++ b/lib/util/substitute.c +@@ -171,32 +171,24 @@ _PUBLIC_ void all_string_sub(char *s,const char *pattern,const char *insert, siz + * talloc version of string_sub2. + */ + +-char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, +- const char *pattern, +- const char *insert, +- bool remove_unsafe_characters, +- bool replace_once, +- bool allow_trailing_dollar) ++bool realloc_string_sub_raw(char **_string, ++ const char *pattern, ++ const char *insert, ++ bool replace_once, ++ bool allow_trailing_dollar, ++ const char *unsafe_characters, ++ char safe_character) + { +- const char *unsafe_characters = STRING_SUB_UNSAFE_CHARACTERS; +- const char safe_character = '_'; +- char *p = NULL, ++ char *p = NULL; + char *s = NULL; + char *string = NULL; + ssize_t ls,lp,li,ld, i; + +- if (!insert || !pattern || !*pattern || !src) { +- return NULL; +- } +- +- string = talloc_strdup(mem_ctx, src); +- if (string == NULL) { +- DEBUG(0, ("talloc_string_sub2: " +- "talloc_strdup failed\n")); +- return NULL; ++ if (!insert || !pattern || !*pattern || !_string|| !*_string) { ++ return false; + } + +- s = string; ++ s = string = *_string; + + ls = (ssize_t)strlen(s); + lp = (ssize_t)strlen(pattern); +@@ -205,14 +197,13 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + + while ((p = strstr_m(s,pattern))) { + if (ld > 0) { +- int offset = PTR_DIFF(s,string); +- string = (char *)talloc_realloc_size(mem_ctx, string, +- ls + ld + 1); ++ ptrdiff_t offset = PTR_DIFF(s,string); ++ string = talloc_realloc(NULL, string, char, ls + ld + 1); + if (!string) { +- DEBUG(0, ("talloc_string_sub: out of " +- "memory!\n")); +- return NULL; ++ DBG_ERR("out of memory(realloc)!\n"); ++ return false; + } ++ *_string = string; + p = string + offset + (p - s); + } + if (li != lp) { +@@ -234,6 +225,50 @@ char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + break; + } + } ++ return true; ++} ++ ++char *talloc_string_sub2(TALLOC_CTX *mem_ctx, ++ const char *src, ++ const char *pattern, ++ const char *insert, ++ bool remove_unsafe_characters, ++ bool replace_once, ++ bool allow_trailing_dollar) ++{ ++ const char *unsafe_characters = NULL; ++ char safe_character = '\0'; ++ char *string = NULL; ++ bool ok; ++ ++ if (!insert || !pattern || !*pattern || !src) { ++ return NULL; ++ } ++ ++ if (remove_unsafe_characters) { ++ unsafe_characters = STRING_SUB_UNSAFE_CHARACTERS; ++ safe_character = '_'; ++ } ++ ++ string = talloc_strdup(mem_ctx, src); ++ if (string == NULL) { ++ DBG_ERR("out of memory, talloc_strdup(src)!\n"); ++ return NULL; ++ } ++ ++ ok = realloc_string_sub_raw(&string, ++ pattern, ++ insert, ++ replace_once, ++ allow_trailing_dollar, ++ unsafe_characters, ++ safe_character); ++ if (!ok) { ++ TALLOC_FREE(string); ++ DBG_ERR("out of memory, realloc_string_sub_raw()!\n"); ++ return NULL; ++ } ++ + return string; + } + +diff --git a/lib/util/substitute.h b/lib/util/substitute.h +index e1a82859daca..041a649fd181 100644 +--- a/lib/util/substitute.h ++++ b/lib/util/substitute.h +@@ -51,6 +51,24 @@ void string_sub(char *s,const char *pattern, const char *insert, size_t len); + **/ + void all_string_sub(char *s,const char *pattern,const char *insert, size_t len); + ++/* ++ * If unsafe_characters is NULL all characters are allowed, ++ * if unsafe_characters is not NULL all characters caught ++ * by iscntrl() are also replaced by safe_character. ++ * ++ * *_string might be reallocated! ++ * ++ * On error *_string may still be reallocated and ++ * may contain partial replacements. ++ */ ++bool realloc_string_sub_raw(char **_string, ++ const char *pattern, ++ const char *insert, ++ bool replace_once, ++ bool allow_trailing_dollar, ++ const char *unsafe_characters, ++ char safe_character); ++ + char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src, + const char *pattern, + const char *insert, +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p5.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p5.patch new file mode 100644 index 0000000000..056be12eb6 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p5.patch @@ -0,0 +1,46 @@ +From 113ba24197ca4e5bd683951f99fa4553a4240e48 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Wed, 6 May 2026 17:23:39 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: s3:lib: fix potential + memory leak in talloc_sub_basic() + +This makes the code easier to understand... + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/113ba24197ca4e5bd683951f99fa4553a4240e48] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 113ba24197ca4e5bd683951f99fa4553a4240e48) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + source3/lib/substitute.c | 2 ++ + 1 file changed, 2 insertions(+) + +diff --git a/source3/lib/substitute.c b/source3/lib/substitute.c +index 40eb15aee04b..5121fcaac1c4 100644 +--- a/source3/lib/substitute.c ++++ b/source3/lib/substitute.c +@@ -317,6 +317,7 @@ char *talloc_sub_basic(TALLOC_CTX *mem_ctx, + } + + tmp_ctx = talloc_stackframe(); ++ a_string = talloc_steal(tmp_ctx, a_string); + + for (s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) { + +@@ -478,6 +479,7 @@ error: + TALLOC_FREE(a_string); + + done: ++ a_string = talloc_steal(mem_ctx, a_string); + TALLOC_FREE(tmp_ctx); + return a_string; + } +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p6.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p6.patch new file mode 100644 index 0000000000..3b04d99f40 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p6.patch @@ -0,0 +1,131 @@ +From c4a93471622e5d7f8e28073029f3ebfbe22b6288 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 23 Apr 2026 21:11:27 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: s3:lib: let + realloc_string_sub2() use realloc_string_sub_raw() + +We don't need this logic more than once! + +But we leave the strange calling convention of +realloc_string_sub2(), where the caller it +not allowed to use the passed pointer when +NULL is returned... + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/c4a93471622e5d7f8e28073029f3ebfbe22b6288] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit c4a93471622e5d7f8e28073029f3ebfbe22b6288) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + source3/lib/substitute_generic.c | 81 ++++++++++---------------------- + 1 file changed, 24 insertions(+), 57 deletions(-) + +diff --git a/source3/lib/substitute_generic.c b/source3/lib/substitute_generic.c +index 26c5ee761f8b..e0639f04eb8e 100644 +--- a/source3/lib/substitute_generic.c ++++ b/source3/lib/substitute_generic.c +@@ -37,71 +37,38 @@ char *realloc_string_sub2(char *string, + bool remove_unsafe_characters, + bool allow_trailing_dollar) + { +- char *p, *in; +- char *s; +- ssize_t ls,lp,li,ld, i; ++ const char *unsafe_characters = NULL; ++ char safe_character = '\0'; ++ bool ok; + + if (!insert || !pattern || !*pattern || !string || !*string) + return NULL; + +- s = string; ++ if (remove_unsafe_characters) { ++ unsafe_characters = STRING_SUB_UNSAFE_CHARACTERS; ++ safe_character = '_'; ++ } + +- in = talloc_strdup(talloc_tos(), insert); +- if (!in) { +- DEBUG(0, ("realloc_string_sub: out of memory!\n")); ++ ok = realloc_string_sub_raw(&string, ++ pattern, ++ insert, ++ false, /* replace_once */ ++ allow_trailing_dollar, ++ unsafe_characters, ++ safe_character); ++ if (!ok) { ++ DBG_ERR("out of memory, realloc_string_sub_raw()!\n"); ++ /* ++ * The calling convention of realloc_string_sub2() ++ * is very strange regarding stale string pointers. ++ * ++ * It is assumed the given string was allocated ++ * on talloc_tos(), so we just don't touch ++ * it at all here... ++ */ + return NULL; + } +- ls = (ssize_t)strlen(s); +- lp = (ssize_t)strlen(pattern); +- li = (ssize_t)strlen(insert); +- ld = li - lp; +- for (i=0;i<li;i++) { +- switch (in[i]) { +- case '$': +- /* allow a trailing $ +- * (as in machine accounts) */ +- if (allow_trailing_dollar && (i == li - 1 )) { +- break; +- } +- FALL_THROUGH; +- case '`': +- case '"': +- case '\'': +- case ';': +- case '%': +- case '\r': +- case '\n': +- if ( remove_unsafe_characters ) { +- in[i] = '_'; +- break; +- } +- FALL_THROUGH; +- default: +- /* ok */ +- break; +- } +- } + +- while ((p = strstr_m(s,pattern))) { +- if (ld > 0) { +- int offset = PTR_DIFF(s,string); +- string = talloc_realloc(NULL, string, char, ls + ld + 1); +- if (!string) { +- DEBUG(0, ("realloc_string_sub: " +- "out of memory!\n")); +- talloc_free(in); +- return NULL; +- } +- p = string + offset + (p - s); +- } +- if (li != lp) { +- memmove(p+li,p+lp,strlen(p+lp)+1); +- } +- memcpy(p, in, li); +- s = p + li; +- ls += ld; +- } +- talloc_free(in); + return string; + } + +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p7.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p7.patch new file mode 100644 index 0000000000..a4052845fc --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p7.patch @@ -0,0 +1,84 @@ +From 003ff9b49f65d8006330a018da6fe0169a6fdb48 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 23 Apr 2026 18:21:08 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: let + mask_unsafe_character() check all control characters + +There's no reason to mask only \r and \n. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/003ff9b49f65d8006330a018da6fe0169a6fdb48] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 003ff9b49f65d8006330a018da6fe0169a6fdb48) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/substitute.c | 8 +++++++- + lib/util/substitute.h | 6 +++--- + 2 files changed, 10 insertions(+), 4 deletions(-) + +diff --git a/lib/util/substitute.c b/lib/util/substitute.c +index 465aea866055..30989927da72 100644 +--- a/lib/util/substitute.c ++++ b/lib/util/substitute.c +@@ -22,6 +22,7 @@ + */ + + #include "replace.h" ++#include "system/locale.h" + #include "debug.h" + #ifndef SAMBA_UTIL_CORE_ONLY + #include "charset/charset.h" +@@ -53,6 +54,10 @@ char mask_unsafe_character(char in, + return in; + } + ++ if (iscntrl(in)) { ++ return safe_out; ++ } ++ + unsafe = strchr(unsafe_characters, in); + if (unsafe != NULL) { + return safe_out; +@@ -69,7 +74,8 @@ char mask_unsafe_character(char in, + This routine looks for pattern in s and replaces it with + insert. It may do multiple replacements or just one. + +- Any of STRING_SUB_UNSAFE_CHARACTERS in the insert string are replaced with _ ++ Any of STRING_SUB_UNSAFE_CHARACTERS and any character ++ caught by calling iscntrl() in the insert string are replaced with _ + + if len==0 then the string cannot be extended. This is different from the old + use of len==0 which was for no length checks to be done. +diff --git a/lib/util/substitute.h b/lib/util/substitute.h +index 041a649fd181..b183d864671a 100644 +--- a/lib/util/substitute.h ++++ b/lib/util/substitute.h +@@ -26,7 +26,7 @@ + + #include <talloc.h> + +-#define STRING_SUB_UNSAFE_CHARACTERS "$`\"';%\r\n" ++#define STRING_SUB_UNSAFE_CHARACTERS "$`\"';%" + + /** + Substitute a string for a pattern in another string. Make sure there is +@@ -35,8 +35,8 @@ + This routine looks for pattern in s and replaces it with + insert. It may do multiple replacements. + +- Any of STRING_SUB_UNSAFE_CHARACTERS (see above) in the +- insert string are replaced with _ ++ Any of STRING_SUB_UNSAFE_CHARACTERS (see above) and any character ++ caught by calling iscntrl() in the insert string are replaced with _ + + if len==0 then the string cannot be extended. This is different from the old + use of len==0 which was for no length checks to be done. +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p8.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p8.patch new file mode 100644 index 0000000000..f99cf2653b --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p8.patch @@ -0,0 +1,39 @@ +From 5551dd76e92480625f00765f183d753dcb857894 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Thu, 23 Apr 2026 18:21:08 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: add more unsafe + characters to STRING_SUB_UNSAFE_CHARACTERS + +|&<> are unsafe characters for shell processing. + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/5551dd76e92480625f00765f183d753dcb857894] + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 5551dd76e92480625f00765f183d753dcb857894) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/substitute.h | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/lib/util/substitute.h b/lib/util/substitute.h +index b183d864671a..41f56c73ba2c 100644 +--- a/lib/util/substitute.h ++++ b/lib/util/substitute.h +@@ -26,7 +26,7 @@ + + #include <talloc.h> + +-#define STRING_SUB_UNSAFE_CHARACTERS "$`\"';%" ++#define STRING_SUB_UNSAFE_CHARACTERS "$`\"';%|&<>" + + /** + Substitute a string for a pattern in another string. Make sure there is +-- +2.43.0 + + diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p9.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p9.patch new file mode 100644 index 0000000000..0951bd16a9 --- /dev/null +++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2026-4408_p9.patch @@ -0,0 +1,61 @@ +From 0cabcbd24cf2eec692b1a9642447e81c97cc90b7 Mon Sep 17 00:00:00 2001 +From: Stefan Metzmacher <[email protected]> +Date: Fri, 8 May 2026 22:33:32 +0200 +Subject: [PATCH] CVE-2026-4480/CVE-2026-4408: lib/util: let log_escape() + make use of iscntrl() + +using iscntrl() also handles 0x7F (DEL). + +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16033 +BUG: https://bugzilla.samba.org/show_bug.cgi?id=16034 + +CVE: CVE-2026-4408 +Upstream-Status: Backport [https://gitlab.com/samba-team/samba/-/commit/0cabcbd24cf2eec692b1a9642447e81c97cc90b7] + +Backport Changes: +- Adjusted context for Samba 4.19.9 where encoded_length() still takes char; + use unsigned char so iscntrl() receives the same safe input type as upstream. + +Signed-off-by: Stefan Metzmacher <[email protected]> +Reviewed-by: Douglas Bagnall <[email protected]> +(cherry picked from commit 0cabcbd24cf2eec692b1a9642447e81c97cc90b7) +Signed-off-by: Ashishkumar Parmar <[email protected]> +--- + lib/util/util_str_escape.c | 6 ++++-- + 1 file changed, 4 insertions(+), 2 deletions(-) + +diff --git a/lib/util/util_str_escape.c b/lib/util/util_str_escape.c +index 21f6130a3d60..c6d7a0c9e77a 100644 +--- a/lib/util/util_str_escape.c ++++ b/lib/util/util_str_escape.c +@@ -18,6 +18,7 @@ + */ + + #include "replace.h" ++#include "system/locale.h" + #include "lib/util/debug.h" + #include "lib/util/util_str_escape.h" + +@@ -26,9 +27,9 @@ + * Calculate the encoded length of a character for log_escape + * + */ +-static size_t encoded_length(char c) ++static size_t encoded_length(unsigned char c) + { +- if (c != '\\' && c > 0x1F) { ++ if (c != '\\' && !iscntrl(c)) { + return 1; + } else { + switch (c) { +@@ -79,7 +80,7 @@ char *log_escape(TALLOC_CTX *frame, const char *in) + c = in; + e = encoded; + while (*c) { +- if (*c != '\\' && *c > 0x1F) { ++ if (*c != '\\' && !iscntrl((unsigned char)(*c))) { + *e++ = *c++; + } else { + switch (*c) { +-- +2.43.0 diff --git a/meta-networking/recipes-connectivity/samba/samba_4.19.9.bb b/meta-networking/recipes-connectivity/samba/samba_4.19.9.bb index 055e404bb9..5e649ec66f 100644 --- a/meta-networking/recipes-connectivity/samba/samba_4.19.9.bb +++ b/meta-networking/recipes-connectivity/samba/samba_4.19.9.bb @@ -26,6 +26,24 @@ SRC_URI = "${SAMBA_MIRROR}/stable/samba-${PV}.tar.gz \ file://0007-Deleted-settiong-of-python-to-fix-the-install-confli.patch \ file://CVE-2026-3012_p1.patch \ file://CVE-2026-3012_p2.patch \ + file://CVE-2026-4408_p1.patch \ + file://CVE-2026-4408_p2.patch \ + file://CVE-2026-4408_p3.patch \ + file://CVE-2026-4408_p4.patch \ + file://CVE-2026-4408_p5.patch \ + file://CVE-2026-4408_p6.patch \ + file://CVE-2026-4408_p7.patch \ + file://CVE-2026-4408_p8.patch \ + file://CVE-2026-4408_p9.patch \ + file://CVE-2026-4408_p10.patch \ + file://CVE-2026-4408_p11.patch \ + file://CVE-2026-4408_p12.patch \ + file://CVE-2026-4408_p13.patch \ + file://CVE-2026-4408_p14.patch \ + file://CVE-2026-4408_p15.patch \ + file://CVE-2026-4408_p16.patch \ + file://CVE-2026-4408_p17.patch \ + file://CVE-2026-4408_p18.patch \ " SRC_URI:append:libc-musl = " \ -- 2.35.6
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