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CVE-2023-22742

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6678-1
Posted Mar 6, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6678-1 - It was discovered that libgit2 mishandled equivalent filenames on NTFS partitions. If a user or automated system were tricked into cloning a specially crafted repository, an attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. It was discovered that libgit2 did not perform certificate checking by default. An attacker could possibly use this issue to perform a machine-in-the-middle attack. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS.

tags | advisory, arbitrary
systems | linux, ubuntu
advisories | CVE-2020-12278, CVE-2023-22742, CVE-2024-24575, CVE-2024-24577
SHA-256 | 7b3086cc98d56d838c607776e3a17b3c2150866662ba214c0dc65ab02e4712cb
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