USN-6407-1

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    USN-6407-1

    Published: 3 Oct 2023Last Modified: 27 Apr 2026

    Summary: libx11 vulnerabilities

    Details: Gregory James Duck discovered that libx11 incorrectly handled certain keyboard symbols. If a user were tricked into connecting to a malicious X server, a remote attacker could use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-43785) Yair Mizrahi discovered that libx11 incorrectly handled certain malformed XPM image files. If a user were tricked into opening a specially crafted XPM image file, a remote attacker could possibly use this issue to consume memory, leading to a denial of service. (CVE-2023-43786) Yair Mizrahi discovered that libx11 incorrectly handled certain malformed XPM image files. If a user were tricked into opening a specially crafted XPM image file, a remote attacker could use this issue to cause libx11 to crash, leading to a denial of service, or possibly execute arbitrary code. (CVE-2023-43787)

    References: https://ubuntu.com/security/notices/USN-6407-1, https://ubuntu.com/security/CVE-2023-43785, https://ubuntu.com/security/CVE-2023-43786, https://ubuntu.com/security/CVE-2023-43787

    Affected packages

    Package

    Name: libx11

    Purl: pkg:deb/ubuntu/libx11@2:1.6.9-2ubuntu1.6?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:1.6.9-2ubuntu1.6

    Affected versions

    2:1.6.8-1
    2:1.6.9-2
    2:1.6.9-2ubuntu1
    2:1.6.9-2ubuntu1.1
    2:1.6.9-2ubuntu1.2
    2:1.6.9-2ubuntu1.5

    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
    USN-6407-1 | CVE-DB