CVE-2023-22742
When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default.
Does this matter?
Lower severity and a low EPSS score (0.58%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.58% probability · 46th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- libgit2/libgit2
- Source
- security-advisories@github.com
References
- http://www.openwall.com/lists/oss-security/2023/11/06/5
- https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56Patch, Third Party Advisory
- https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58eaPatch, Third Party Advisory
- https://github.com/libgit2/libgit2/releases/tag/v1.4.5Release Notes, Third Party Advisory
- https://github.com/libgit2/libgit2/releases/tag/v1.5.1Release Notes, Third Party Advisory
- https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjqThird Party Advisory
- https://www.libssh2.orgThird Party Advisory
- http://www.openwall.com/lists/oss-security/2023/11/06/5
- https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56Patch, Third Party Advisory
- https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58eaPatch, Third Party Advisory
- https://github.com/libgit2/libgit2/releases/tag/v1.4.5Release Notes, Third Party Advisory
- https://github.com/libgit2/libgit2/releases/tag/v1.5.1Release Notes, Third Party Advisory
- https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjqThird Party Advisory
- https://www.libssh2.orgThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.