CVE-2023-22742

A flaw was found in libgit2, 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.

Mitigation

Upgrade the package as soon as possible. Users unable to upgrade should ensure that all relevant certificates are manually checked.