high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2023-0494: Use After Free

First published: Tue Jan 31 2023(Updated: )

A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in DeepCopyPointerClasses that can be exploited by ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read and write into freed memory. This can lead to local privilege elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/xorg-server<21.1.7
21.1.7
X.Org X Server<21.1.7
Fedoraproject Fedora=36
Fedoraproject Fedora=37
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux=8.1
Redhat Enterprise Linux=9.0
Redhat Enterprise Linux Aus=8.4
Redhat Enterprise Linux Aus=8.6
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Eus=8.4
Redhat Enterprise Linux Eus=8.6
Redhat Enterprise Linux Eus=9.0
Redhat Enterprise Linux For Ibm Z Systems=7.0
Redhat Enterprise Linux For Ibm Z Systems=8.0
Redhat Enterprise Linux For Ibm Z Systems Eus=8.4
Redhat Enterprise Linux For Ibm Z Systems Eus=8.6
Redhat Enterprise Linux For Power Big Endian=7.0
Redhat Enterprise Linux For Power Little Endian=7.0
Redhat Enterprise Linux For Power Little Endian=8.0
Redhat Enterprise Linux For Power Little Endian=9.0
Redhat Enterprise Linux For Power Little Endian Eus=8.4
Redhat Enterprise Linux For Power Little Endian Eus=8.6
Redhat Enterprise Linux For Scientific Computing=7.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Aus=8.2
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.1
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.2
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.4
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.6
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=9.0
Redhat Enterprise Linux Server Tus=8.2
Redhat Enterprise Linux Server Tus=8.4
Redhat Enterprise Linux Server Tus=8.6
Redhat Enterprise Linux Server Update Services For Sap Solutions=8.2
Redhat Enterprise Linux Server Workstation=7.0

Remedy

https://gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6d8c37071131a49790243cdac55392ecf71ec

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2023-0494?

    The severity of CVE-2023-0494 is high with a CVSS score of 7.8.

  • Which software is affected by CVE-2023-0494?

    The software affected by CVE-2023-0494 includes X.Org X Server, xorg-server, and various versions of Fedora and Redhat Enterprise Linux.

  • How can CVE-2023-0494 be exploited?

    CVE-2023-0494 can be exploited by using the ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() functions to read and write into freed memory, leading to local privilege elevation.

  • How can I fix CVE-2023-0494?

    To fix CVE-2023-0494, update to version 21.1.7 of xorg-server.

  • Where can I find more information about CVE-2023-0494?

    More information about CVE-2023-0494 can be found in the X.Org announcement and the Redhat bugzilla links provided.

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