libgit2: CVE-2023-22742: fails to verify SSH keys by default

Debian Bug report logs - #1029368
libgit2: CVE-2023-22742: fails to verify SSH keys by default

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: libgit2: CVE-2023-22742: fails to verify SSH keys by default

Date: Sat, 21 Jan 2023 22:19:16 +0100

Source: libgit2
Version: 1.5.0+ds-6
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for libgit2.

CVE-2023-22742[0]:
| libgit2 is a cross-platform, linkable library implementation of Git.
| When using an SSH remote with the optional libssh4 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2023-22742
    https://www.cve.org/CVERecord?id=CVE-2023-22742
[1] https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq
[2] https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56 

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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