The branch, v4-4-test has been updated
via 374fb91 VERSION: Bump version up to 4.4.17...
via 09fa5f7 Merge tag 'samba-4.4.16' into v4-4-test
via 89edb76 VERSION: Disable GIT_SNAPSHOTS for the 4.4.16 release.
via 2ef4251 WHATSNEW: Add release notes for Samba 4.4.16.
via bf85c3d CVE-2017-12163: s3:smbd: Prevent client short SMB1 write
from writing server memory to file.
via 50f649e CVE-2017-12151: s3:libsmb: make use of
cli_state_is_encryption_on()
via 17019aa CVE-2017-12151: s3:libsmb: add cli_state_is_encryption_on()
helper function
via 81f1804 CVE-2017-12150: s3:libsmb: only fallback to anonymous if
authentication was not requested
via 4a91f4a CVE-2017-12150: libcli/smb: add
smbXcli_conn_signing_mandatory()
via b063223 CVE-2017-12150: auth/credentials:
cli_credentials_authentication_requested() should check for
NTLM_CCACHE/SIGN/SEAL
via 95f6e5b CVE-2017-12150: libgpo: make use of SMB_SIGNING_REQUIRED in
gpo_connect_server()
via 26b87d0 CVE-2017-12150: s3:pylibsmb: make use of
SMB_SIGNING_DEFAULT for 'samba.samba3.libsmb_samba_internal'
via 428ede3 CVE-2017-12150: s3:lib: get_cmdline_auth_info_signing_state
smb_encrypt SMB_SIGNING_REQUIRED
via 084bf98 VERSION: Bump version up to 4.5.16...
from 189a717 s3: smbd: Fix a read after free if a chained SMB1 call goes
async.
https://git.samba.org/?p=samba.git;a=shortlog;h=v4-4-test
- Log -----------------------------------------------------------------
commit 374fb910aaebdd0c209236cc3776479ab0e83768
Author: Karolin Seeger <[email protected]>
Date: Wed Sep 20 13:05:49 2017 +0200
VERSION: Bump version up to 4.4.17...
and re-enable GIT_SNAPSHOTS.
Signed-off-by: Karolin Seeger <[email protected]>
commit 09fa5f7dbb9828a9cb9f4df4b3150c884db42861
Merge: 189a717 89edb76
Author: Karolin Seeger <[email protected]>
Date: Wed Sep 20 13:05:23 2017 +0200
Merge tag 'samba-4.4.16' into v4-4-test
samba: tag release samba-4.4.16
-----------------------------------------------------------------------
Summary of changes:
VERSION | 4 +-
WHATSNEW.txt | 84 ++++++++++++++++++++++++++++++++++++++++-
auth/credentials/credentials.c | 16 ++++++++
libcli/smb/smbXcli_base.c | 5 +++
libcli/smb/smbXcli_base.h | 1 +
libgpo/gpo_fetch.c | 2 +-
source3/lib/util_cmdline.c | 3 ++
source3/libsmb/clidfs.c | 6 ++-
source3/libsmb/clientgen.c | 13 +++++++
source3/libsmb/libsmb_context.c | 2 +-
source3/libsmb/proto.h | 1 +
source3/libsmb/pylibsmb.c | 2 +-
source3/smbd/reply.c | 50 ++++++++++++++++++++++++
13 files changed, 180 insertions(+), 9 deletions(-)
Changeset truncated at 500 lines:
diff --git a/VERSION b/VERSION
index 1a67456..602ba75 100644
--- a/VERSION
+++ b/VERSION
@@ -25,7 +25,7 @@
########################################################
SAMBA_VERSION_MAJOR=4
SAMBA_VERSION_MINOR=4
-SAMBA_VERSION_RELEASE=15
+SAMBA_VERSION_RELEASE=17
########################################################
# If a official release has a serious bug #
@@ -99,7 +99,7 @@ SAMBA_VERSION_RC_RELEASE=
# e.g. SAMBA_VERSION_IS_SVN_SNAPSHOT=yes #
# -> "3.0.0-SVN-build-199" #
########################################################
-SAMBA_VERSION_IS_GIT_SNAPSHOT=no
+SAMBA_VERSION_IS_GIT_SNAPSHOT=yes
########################################################
# This is for specifying a release nickname #
diff --git a/WHATSNEW.txt b/WHATSNEW.txt
index 476ea80..f97f799 100644
--- a/WHATSNEW.txt
+++ b/WHATSNEW.txt
@@ -1,4 +1,84 @@
==============================
+ Release Notes for Samba 4.4.16
+ September 20, 2017
+ ==============================
+
+
+This is a security release in order to address the following defects:
+
+o CVE-2017-12150 (SMB1/2/3 connections may not require signing where they
+ should)
+o CVE-2017-12151 (SMB3 connections don't keep encryption across DFS redirects)
+o CVE-2017-12163 (Server memory information leak over SMB1)
+
+
+=======
+Details
+=======
+
+o CVE-2017-12150:
+ A man in the middle attack may hijack client connections.
+
+o CVE-2017-12151:
+ A man in the middle attack can read and may alter confidential
+ documents transferred via a client connection, which are reached
+ via DFS redirect when the original connection used SMB3.
+
+o CVE-2017-12163:
+ Client with write access to a share can cause server memory contents to be
+ written into a file or printer.
+
+For more details and workarounds, please see the security advisories:
+
+ o https://www.samba.org/samba/security/CVE-2017-12150.html
+ o https://www.samba.org/samba/security/CVE-2017-12151.html
+ o https://www.samba.org/samba/security/CVE-2017-12163.html
+
+
+Changes since 4.4.15:
+---------------------
+
+o Jeremy Allison <[email protected]>
+ * BUG 12836: s3: smbd: Fix a read after free if a chained SMB1 call goes
+ async.
+ * BUG 13020: CVE-2017-12163: s3:smbd: Prevent client short SMB1 write from
+ writing server memory to file.
+
+o Ralph Boehme <[email protected]>
+ * BUG 12885: s3/smbd: Let non_widelink_open() chdir() to directories
+ directly.
+
+o Stefan Metzmacher <[email protected]>
+ * BUG 12996: CVE-2017-12151: Keep required encryption across SMB3 dfs
+ redirects.
+ * BUG 12997: CVE-2017-12150: Some code path don't enforce smb signing
+ when they should.
+
+
+#######################################
+Reporting bugs & Development Discussion
+#######################################
+
+Please discuss this release on the samba-technical mailing list or by
+joining the #samba-technical IRC channel on irc.freenode.net.
+
+If you do report problems then please try to send high quality
+feedback. If you don't provide vital information to help us track down
+the problem then you will probably be ignored. All bug reports should
+be filed under the "Samba 4.1 and newer" product in the project's Bugzilla
+database (https://bugzilla.samba.org/).
+
+
+======================================================================
+== Our Code, Our Bugs, Our Responsibility.
+== The Samba Team
+======================================================================
+
+
+Release notes for older releases follow:
+----------------------------------------
+
+ ==============================
Release Notes for Samba 4.4.15
July 12, 2017
==============================
@@ -48,8 +128,8 @@ database (https://bugzilla.samba.org/).
======================================================================
-Release notes for older releases follow:
-----------------------------------------
+----------------------------------------------------------------------
+
==============================
Release Notes for Samba 4.4.14
diff --git a/auth/credentials/credentials.c b/auth/credentials/credentials.c
index 3b7d42a..43e587a 100644
--- a/auth/credentials/credentials.c
+++ b/auth/credentials/credentials.c
@@ -25,6 +25,7 @@
#include "librpc/gen_ndr/samr.h" /* for struct samrPassword */
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_internal.h"
+#include "auth/gensec/gensec.h"
#include "libcli/auth/libcli_auth.h"
#include "tevent.h"
#include "param/param.h"
@@ -362,6 +363,8 @@ _PUBLIC_ bool cli_credentials_set_principal_callback(struct
cli_credentials *cre
_PUBLIC_ bool cli_credentials_authentication_requested(struct cli_credentials
*cred)
{
+ uint32_t gensec_features = 0;
+
if (cred->bind_dn) {
return true;
}
@@ -389,6 +392,19 @@ _PUBLIC_ bool
cli_credentials_authentication_requested(struct cli_credentials *c
return true;
}
+ gensec_features = cli_credentials_get_gensec_features(cred);
+ if (gensec_features & GENSEC_FEATURE_NTLM_CCACHE) {
+ return true;
+ }
+
+ if (gensec_features & GENSEC_FEATURE_SIGN) {
+ return true;
+ }
+
+ if (gensec_features & GENSEC_FEATURE_SEAL) {
+ return true;
+ }
+
return false;
}
diff --git a/libcli/smb/smbXcli_base.c b/libcli/smb/smbXcli_base.c
index 691b8ff..3c41127 100644
--- a/libcli/smb/smbXcli_base.c
+++ b/libcli/smb/smbXcli_base.c
@@ -468,6 +468,11 @@ bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
return false;
}
+bool smbXcli_conn_signing_mandatory(struct smbXcli_conn *conn)
+{
+ return conn->mandatory_signing;
+}
+
void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
{
set_socket_options(conn->sock_fd, options);
diff --git a/libcli/smb/smbXcli_base.h b/libcli/smb/smbXcli_base.h
index 16c8848..6809807 100644
--- a/libcli/smb/smbXcli_base.h
+++ b/libcli/smb/smbXcli_base.h
@@ -47,6 +47,7 @@ bool smbXcli_conn_dfs_supported(struct smbXcli_conn *conn);
enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn);
bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn);
+bool smbXcli_conn_signing_mandatory(struct smbXcli_conn *conn);
void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options);
const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn
*conn);
diff --git a/libgpo/gpo_fetch.c b/libgpo/gpo_fetch.c
index 6b01544..cb969ff 100644
--- a/libgpo/gpo_fetch.c
+++ b/libgpo/gpo_fetch.c
@@ -133,7 +133,7 @@ static NTSTATUS gpo_connect_server(ADS_STRUCT *ads,
ads->auth.password,
CLI_FULL_CONNECTION_USE_KERBEROS |
CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS,
- Undefined);
+ SMB_SIGNING_REQUIRED);
if (!NT_STATUS_IS_OK(result)) {
DEBUG(10,("check_refresh_gpo: "
"failed to connect: %s\n",
diff --git a/source3/lib/util_cmdline.c b/source3/lib/util_cmdline.c
index 80c3ecd..539fa55 100644
--- a/source3/lib/util_cmdline.c
+++ b/source3/lib/util_cmdline.c
@@ -123,6 +123,9 @@ bool set_cmdline_auth_info_signing_state(struct
user_auth_info *auth_info,
int get_cmdline_auth_info_signing_state(const struct user_auth_info *auth_info)
{
+ if (auth_info->smb_encrypt) {
+ return SMB_SIGNING_REQUIRED;
+ }
return auth_info->signing_state;
}
diff --git a/source3/libsmb/clidfs.c b/source3/libsmb/clidfs.c
index d2a4c19..074f8ed 100644
--- a/source3/libsmb/clidfs.c
+++ b/source3/libsmb/clidfs.c
@@ -203,7 +203,9 @@ static NTSTATUS do_connect(TALLOC_CTX *ctx,
/* If a password was not supplied then
* try again with a null username. */
if (password[0] || !username[0] ||
+ force_encrypt ||
smbXcli_conn_signing_mandatory(c->conn) ||
get_cmdline_auth_info_use_kerberos(auth_info) ||
+ get_cmdline_auth_info_use_ccache(auth_info) ||
!NT_STATUS_IS_OK(status = cli_session_setup(c, "",
"", 0,
"", 0,
@@ -952,7 +954,7 @@ NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
"IPC$",
dfs_auth_info,
false,
- smb1cli_conn_encryption_on(rootcli->conn),
+ cli_state_is_encryption_on(rootcli),
smbXcli_conn_protocol(rootcli->conn),
0,
0x20,
@@ -1010,7 +1012,7 @@ NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
dfs_refs[count].share,
dfs_auth_info,
false,
- smb1cli_conn_encryption_on(rootcli->conn),
+ cli_state_is_encryption_on(rootcli),
smbXcli_conn_protocol(rootcli->conn),
0,
0x20,
diff --git a/source3/libsmb/clientgen.c b/source3/libsmb/clientgen.c
index cfb3b16..868ee59 100644
--- a/source3/libsmb/clientgen.c
+++ b/source3/libsmb/clientgen.c
@@ -339,6 +339,19 @@ uint16_t cli_getpid(struct cli_state *cli)
return cli->smb1.pid;
}
+bool cli_state_is_encryption_on(struct cli_state *cli)
+{
+ if (smbXcli_conn_protocol(cli->conn) < PROTOCOL_SMB2_02) {
+ return smb1cli_conn_encryption_on(cli->conn);
+ }
+
+ if (cli->smb2.tcon == NULL) {
+ return false;
+ }
+
+ return smb2cli_tcon_is_encryption_on(cli->smb2.tcon);
+}
+
bool cli_state_has_tcon(struct cli_state *cli)
{
uint16_t tid = cli_state_get_tid(cli);
diff --git a/source3/libsmb/libsmb_context.c b/source3/libsmb/libsmb_context.c
index 5e31dfb..0513374 100644
--- a/source3/libsmb/libsmb_context.c
+++ b/source3/libsmb/libsmb_context.c
@@ -485,7 +485,7 @@ smbc_option_get(SMBCCTX *context,
for (s = context->internal->servers; s; s = s->next) {
num_servers++;
- if (!smb1cli_conn_encryption_on(s->cli->conn)) {
+ if (!cli_state_is_encryption_on(s->cli)) {
return (void *)false;
}
}
diff --git a/source3/libsmb/proto.h b/source3/libsmb/proto.h
index dc9aa17..e872e31 100644
--- a/source3/libsmb/proto.h
+++ b/source3/libsmb/proto.h
@@ -174,6 +174,7 @@ const char *cli_state_remote_realm(struct cli_state *cli);
uint16_t cli_state_get_vc_num(struct cli_state *cli);
uint16_t cli_setpid(struct cli_state *cli, uint16_t pid);
uint16_t cli_getpid(struct cli_state *cli);
+bool cli_state_is_encryption_on(struct cli_state *cli);
bool cli_state_has_tcon(struct cli_state *cli);
uint16_t cli_state_get_tid(struct cli_state *cli);
uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid);
diff --git a/source3/libsmb/pylibsmb.c b/source3/libsmb/pylibsmb.c
index 0c5d7e9..97aa39e 100644
--- a/source3/libsmb/pylibsmb.c
+++ b/source3/libsmb/pylibsmb.c
@@ -447,7 +447,7 @@ static int py_cli_state_init(struct py_cli_state *self,
PyObject *args,
cli_credentials_get_username(cli_creds),
cli_credentials_get_domain(cli_creds),
cli_credentials_get_password(cli_creds),
- 0, 0);
+ 0, SMB_SIGNING_DEFAULT);
if (!py_tevent_req_wait_exc(self->ev, req)) {
return -1;
}
diff --git a/source3/smbd/reply.c b/source3/smbd/reply.c
index 3ba61a3..9896ff8 100644
--- a/source3/smbd/reply.c
+++ b/source3/smbd/reply.c
@@ -4463,6 +4463,9 @@ void reply_writebraw(struct smb_request *req)
}
/* Ensure we don't write bytes past the end of this packet. */
+ /*
+ * This already protects us against CVE-2017-12163.
+ */
if (data + numtowrite > smb_base(req->inbuf) + smb_len(req->inbuf)) {
reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
error_to_writebrawerr(req);
@@ -4563,6 +4566,11 @@ void reply_writebraw(struct smb_request *req)
exit_server_cleanly("secondary writebraw failed");
}
+ /*
+ * We are not vulnerable to CVE-2017-12163
+ * here as we are guarenteed to have numtowrite
+ * bytes available - we just read from the client.
+ */
nwritten =
write_file(req,fsp,buf+4,startpos+nwritten,numtowrite);
if (nwritten == -1) {
TALLOC_FREE(buf);
@@ -4644,6 +4652,7 @@ void reply_writeunlock(struct smb_request *req)
connection_struct *conn = req->conn;
ssize_t nwritten = -1;
size_t numtowrite;
+ size_t remaining;
off_t startpos;
const char *data;
NTSTATUS status = NT_STATUS_OK;
@@ -4676,6 +4685,17 @@ void reply_writeunlock(struct smb_request *req)
startpos = IVAL_TO_SMB_OFF_T(req->vwv+2, 0);
data = (const char *)req->buf + 3;
+ /*
+ * Ensure client isn't asking us to write more than
+ * they sent. CVE-2017-12163.
+ */
+ remaining = smbreq_bufrem(req, data);
+ if (numtowrite > remaining) {
+ reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
+ END_PROFILE(SMBwriteunlock);
+ return;
+ }
+
if (!fsp->print_file && numtowrite > 0) {
init_strict_lock_struct(fsp, (uint64_t)req->smbpid,
(uint64_t)startpos, (uint64_t)numtowrite, WRITE_LOCK,
@@ -4757,6 +4777,7 @@ void reply_write(struct smb_request *req)
{
connection_struct *conn = req->conn;
size_t numtowrite;
+ size_t remaining;
ssize_t nwritten = -1;
off_t startpos;
const char *data;
@@ -4797,6 +4818,17 @@ void reply_write(struct smb_request *req)
startpos = IVAL_TO_SMB_OFF_T(req->vwv+2, 0);
data = (const char *)req->buf + 3;
+ /*
+ * Ensure client isn't asking us to write more than
+ * they sent. CVE-2017-12163.
+ */
+ remaining = smbreq_bufrem(req, data);
+ if (numtowrite > remaining) {
+ reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
+ END_PROFILE(SMBwrite);
+ return;
+ }
+
if (!fsp->print_file) {
init_strict_lock_struct(fsp, (uint64_t)req->smbpid,
(uint64_t)startpos, (uint64_t)numtowrite, WRITE_LOCK,
@@ -5023,6 +5055,9 @@ void reply_write_and_X(struct smb_request *req)
goto out;
}
} else {
+ /*
+ * This already protects us against CVE-2017-12163.
+ */
if (smb_doff > smblen || smb_doff + numtowrite < numtowrite ||
smb_doff + numtowrite > smblen) {
reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
@@ -5451,6 +5486,7 @@ void reply_writeclose(struct smb_request *req)
{
connection_struct *conn = req->conn;
size_t numtowrite;
+ size_t remaining;
ssize_t nwritten = -1;
NTSTATUS close_status = NT_STATUS_OK;
off_t startpos;
@@ -5484,6 +5520,17 @@ void reply_writeclose(struct smb_request *req)
mtime = convert_time_t_to_timespec(srv_make_unix_date3(req->vwv+4));
data = (const char *)req->buf + 1;
+ /*
+ * Ensure client isn't asking us to write more than
+ * they sent. CVE-2017-12163.
+ */
+ remaining = smbreq_bufrem(req, data);
+ if (numtowrite > remaining) {
+ reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
+ END_PROFILE(SMBwriteclose);
+ return;
+ }
+
if (fsp->print_file == NULL) {
init_strict_lock_struct(fsp, (uint64_t)req->smbpid,
(uint64_t)startpos, (uint64_t)numtowrite, WRITE_LOCK,
@@ -6079,6 +6126,9 @@ void reply_printwrite(struct smb_request *req)
numtowrite = SVAL(req->buf, 1);
+ /*
+ * This already protects us against CVE-2017-12163.
+ */
if (req->buflen < numtowrite + 3) {
reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
END_PROFILE(SMBsplwr);
--
Samba Shared Repository
