libgit2 up to 1.4.4/1.5.0 signature verification

Summaryinfo

A vulnerability described as problematic has been identified in libgit2 up to 1.4.4/1.5.0. Impacted is an unknown function. Executing a manipulation can lead to signature verification. This vulnerability is registered as CVE-2023-22742. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in libgit2 up to 1.4.4/1.5.0. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The weakness was published 01/21/2023 as GHSA-8643-3wh5-rmjq. The advisory is available at github.com. This vulnerability was named CVE-2023-22742 since 01/06/2023. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 1.4.5 or 1.5.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 42e5db98b963ae503229c63e44e06e439df50e56 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• libgit2

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.5.0

License

• open-source

Website

• Product: https://github.com/libgit2/libgit2/

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