UBUNTU-CVE-2023-22742

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    UBUNTU-CVE-2023-22742

    Published: 20 Jan 2023Last Modified: 12 Aug 2026
    Upstream:
    CVE-2023-22742
    Aliases:
    USN-6678-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2023-22742, https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq, https://github.com/libgit2/libgit2/releases/tag/v1.5.1, https://github.com/libgit2/libgit2/releases/tag/v1.4.5, https://www.libssh2.org, https://ubuntu.com/security/notices/USN-6678-1, https://www.cve.org/CVERecord?id=CVE-2023-22742

    Affected packages

    Package

    Name: libgit2

    Purl: pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.24.1-2ubuntu0.2+esm2

    Affected versions

    0.22.2-2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2023-22742 | CVE-DB