rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.1epss 0.4%
exploitation probability
0.4%top 71% of all CVEs
observed exploitation
nono source reports it
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.39 to before 0.10.78, EVP_DigestFinal() always writes EVP_MD_CTX_size(ctx) to the out buffer. If out is smaller than that, MdCtxRef::digest_final() writes past its end, usually corrupting the stack. This is reachable from safe Rust. This vulnerability is fixed in 0.10.78.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Affected products
rust-openssl · rust-opensslReferences
https://github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9f92fehttps://github.com/rust-openssl/rust-openssl/pull/2608https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj