GHSA-m4ch-rfv5-x5g3: git2-rs fails to verify SSH keys by default
The git2 and libgit2-sys crates are Rust wrappers around the libgit2 C library. It was discovered that libgit2 1.5.0 and below did not verify SSH host keys when establishing an SSH connection, exposing users of the library to Man-In-the-Middle attacks.
The libgit2 team assigned CVE-2023-22742 to this vulnerability. The following versions of the libgit2-sys Rust crate have been released:
- libgit2-sys 0.14.2, updating the underlying libgit2 C library to version 1.5.1.
- libgit2-sys 0.13.5, updating the underlying libgit2 C library to version 1.4.5.
A new git2 crate version has also been released, 0.16.1. This version only bumps its libgit2-sys dependency to ensure no vulnerable libgit2-sys versions are used, but contains no code changes: if you update the libgit2-sys version there is no need to also update the git2 crate version.
You can learn more about this vulnerability in libgit2’s advisory
References
- github.com/advisories/GHSA-m4ch-rfv5-x5g3
- github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq
- github.com/rust-lang/git2-rs
- github.com/rust-lang/git2-rs/commit/87934f87d36753ed702792ec063be7246444a8e1
- github.com/rust-lang/git2-rs/security/advisories/GHSA-m4ch-rfv5-x5g3
- nvd.nist.gov/vuln/detail/CVE-2023-22742
- rustsec.org/advisories/RUSTSEC-2023-0003.html
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