There is a stack overflow vulnerability in ash.c:6030 in busybox before 1.35. In the environment of Internet of Vehicles, this vulnerability can be executed from command to arbitrary code execution.
https://nvd.nist.gov/vuln/detail/CVE-2022-48174 CVE: CVE-2022-48174 Signed-off-by: Marek Vasut <[email protected]> --- Cc: Martin Jansa <[email protected]> Cc: Richard Purdie <[email protected]> Cc: Steve Sakoman <[email protected]> --- .../busybox/busybox/CVE-2022-48174.patch | 82 +++++++++++++++++++ meta/recipes-core/busybox/busybox_1.31.1.bb | 1 + 2 files changed, 83 insertions(+) create mode 100644 meta/recipes-core/busybox/busybox/CVE-2022-48174.patch diff --git a/meta/recipes-core/busybox/busybox/CVE-2022-48174.patch b/meta/recipes-core/busybox/busybox/CVE-2022-48174.patch new file mode 100644 index 0000000000..dfba2a7e0f --- /dev/null +++ b/meta/recipes-core/busybox/busybox/CVE-2022-48174.patch @@ -0,0 +1,82 @@ +From c18ebf861528ef24958dd99a146482d2a40014c7 Mon Sep 17 00:00:00 2001 +From: Denys Vlasenko <[email protected]> +Date: Mon, 12 Jun 2023 17:48:47 +0200 +Subject: [PATCH] shell: avoid segfault on ${0::0/0~09J}. Closes 15216 + +function old new delta +evaluate_string 1011 1053 +42 + +CVE: CVE-2022-48174 +Upstream-Status: Backport [d417193cf37ca1005830d7e16f5fa7e1d8a44209] +Signed-off-by: Denys Vlasenko <[email protected]> +--- + shell/math.c | 39 +++++++++++++++++++++++++++++++++++---- + 1 file changed, 35 insertions(+), 4 deletions(-) + +diff --git a/shell/math.c b/shell/math.c +index af1ab55c0..79824e81f 100644 +--- a/shell/math.c ++++ b/shell/math.c +@@ -578,6 +578,28 @@ static arith_t strto_arith_t(const char *nptr, char **endptr) + # endif + #endif + ++//TODO: much better estimation than expr_len/2? Such as: ++//static unsigned estimate_nums_and_names(const char *expr) ++//{ ++// unsigned count = 0; ++// while (*(expr = skip_whitespace(expr)) != '\0') { ++// const char *p; ++// if (isdigit(*expr)) { ++// while (isdigit(*++expr)) ++// continue; ++// count++; ++// continue; ++// } ++// p = endofname(expr); ++// if (p != expr) { ++// expr = p; ++// count++; ++// continue; ++// } ++// } ++// return count; ++//} ++ + static arith_t FAST_FUNC + evaluate_string(arith_state_t *math_state, const char *expr) + { +@@ -585,10 +607,12 @@ evaluate_string(arith_state_t *math_state, const char *expr) + const char *errmsg; + const char *start_expr = expr = skip_whitespace(expr); + unsigned expr_len = strlen(expr) + 2; +- /* Stack of integers */ +- /* The proof that there can be no more than strlen(startbuf)/2+1 +- * integers in any given correct or incorrect expression +- * is left as an exercise to the reader. */ ++ /* Stack of integers/names */ ++ /* There can be no more than strlen(startbuf)/2+1 ++ * integers/names in any given correct or incorrect expression. ++ * (modulo "09v09v09v09v09v" case, ++ * but we have code to detect that early) ++ */ + var_or_num_t *const numstack = alloca((expr_len / 2) * sizeof(numstack[0])); + var_or_num_t *numstackptr = numstack; + /* Stack of operator tokens */ +@@ -657,6 +681,13 @@ evaluate_string(arith_state_t *math_state, const char *expr) + numstackptr->var = NULL; + errno = 0; + numstackptr->val = strto_arith_t(expr, (char**) &expr); ++ /* A number can't be followed by another number, or a variable name. ++ * We'd catch this later anyway, but this would require numstack[] ++ * to be twice as deep to handle strings where _every_ char is ++ * a new number or name. Example: 09v09v09v09v09v09v09v09v09v ++ */ ++ if (isalnum(*expr) || *expr == '_') ++ goto err; + if (errno) + numstackptr->val = 0; /* bash compat */ + goto num; +-- +2.40.1 + diff --git a/meta/recipes-core/busybox/busybox_1.31.1.bb b/meta/recipes-core/busybox/busybox_1.31.1.bb index d062f0f7dd..94aa1467df 100644 --- a/meta/recipes-core/busybox/busybox_1.31.1.bb +++ b/meta/recipes-core/busybox/busybox_1.31.1.bb @@ -55,6 +55,7 @@ SRC_URI = "https://busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \ file://CVE-2021-42374.patch \ file://CVE-2021-42376.patch \ file://CVE-2021-423xx-awk.patch \ + file://CVE-2022-48174.patch \ file://0001-libbb-sockaddr2str-ensure-only-printable-characters-.patch \ file://0002-nslookup-sanitize-all-printed-strings-with-printable.patch \ " -- 2.40.1
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