QID 356766

Date Published: 2023-12-06

QID 356766: Amazon Linux Security Advisory for xorg-x11-server : ALAS2-2023-2352

A use-after-free flaw was found in xorg-x11-server-xvfb.
This issue occurs in xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as zaphod mode).
If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the xvfb server, allowing for possible escalation of privileges or denial of service. (
( CVE-2023-5574)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2023-2352 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 356766

    CVE-2023-5574 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2023-2352 amazon linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2023-2352.html
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