QID 355602

Date Published: 2023-07-24

QID 355602: Amazon Linux Security Advisory for libX11 : ALAS2-2023-2129

A vulnerability was found in libx11.
The security flaw occurs because the functions in src/initext.c in libx11 do not check that the values provided for the request, event, or error ids are within the bounds of the arrays that those functions write to, using those ids as array indexes.
They trust that they were called with values provided by an xserver adhering to the bounds specified in the x11 protocol, as all x servers provided by x.org do.
As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the display structure and not write outside the bounds of the display structure itself, possibly causing the client to crash with this memory corruption. (
( CVE-2023-3138)



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 - 7.5 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2023-2129 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 355602

    CVE-2023-3138 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2023-2129 amazon linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2023-2129.html
    By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].