diff options
Diffstat (limited to 'meta-networking/recipes-support/strongswan/files/CVE-2021-41991.patch')
| -rw-r--r-- | meta-networking/recipes-support/strongswan/files/CVE-2021-41991.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/meta-networking/recipes-support/strongswan/files/CVE-2021-41991.patch b/meta-networking/recipes-support/strongswan/files/CVE-2021-41991.patch new file mode 100644 index 0000000000..2d898fa5cf --- /dev/null +++ b/meta-networking/recipes-support/strongswan/files/CVE-2021-41991.patch @@ -0,0 +1,41 @@ +From b667237b3a84f601ef5a707ce8eb861c3a5002d3 Mon Sep 17 00:00:00 2001 +From: Tobias Brunner <tobias@strongswan.org> +Date: Tue, 28 Sep 2021 19:38:22 +0200 +Subject: [PATCH] cert-cache: Prevent crash due to integer overflow/sign change + +random() allocates values in the range [0, RAND_MAX], with RAND_MAX usually +equaling INT_MAX = 2^31-1. Previously, values between 0 and 31 were added +directly to that offset before applying`% CACHE_SIZE` to get an index into +the cache array. If the random value was very high, this resulted in an +integer overflow and a negative index value and, therefore, an out-of-bounds +access of the array and in turn dereferencing invalid pointers when trying +to acquire the read lock. This most likely results in a segmentation fault. + +Fixes: 764e8b2211ce ("reimplemented certificate cache") +Fixes: CVE-2021-41991 + +Upstream-Status: Backport [https://download.strongswan.org/security/CVE-2021-41991] +CVE: CVE-2021-41991 + +Signed-off-by: Virendra Thakur <virendra.thakur@kpit.com> + +--- + src/libstrongswan/credentials/sets/cert_cache.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/src/libstrongswan/credentials/sets/cert_cache.c b/src/libstrongswan/credentials/sets/cert_cache.c +index f1579c60a9bc..ceebb3843725 100644 +--- a/src/libstrongswan/credentials/sets/cert_cache.c ++++ b/src/libstrongswan/credentials/sets/cert_cache.c +@@ -151,7 +151,7 @@ static void cache(private_cert_cache_t *this, + for (try = 0; try < REPLACE_TRIES; try++) + { + /* replace a random relation */ +- offset = random(); ++ offset = random() % CACHE_SIZE; + for (i = 0; i < CACHE_SIZE; i++) + { + rel = &this->relations[(i + offset) % CACHE_SIZE]; +-- +2.25.1 + |