CVE-2023-22742
libgit2 fails to verify SSH keys by default
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jan 20, 2023
- Updated
- Mar 10, 2025
- Reserved
- Jan 6, 2023
Description
libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the `certificate_check` field of libgit2's `git_remote_callbacks` structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N | GitHub_M |
Weaknesses
- CWE-347 Improper Verification of Cryptographic Signature
Affected Products
| Product | Versions |
|---|---|
libgit2libgit2 |
|
References
- https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq
- https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56
- https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58ea
- https://github.com/libgit2/libgit2/releases/tag/v1.4.5
- https://github.com/libgit2/libgit2/releases/tag/v1.5.1
- https://www.libssh2.org/
- http://www.openwall.com/lists/oss-security/2023/11/06/5
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.