X.Org Security Advisory: Security issue in the X server

Peter Hutterer peter.hutterer at who-t.net
Tue Feb 7 00:28:41 UTC 2023

X.Org Security Advisory: February 07, 2023

Security issue in the X server

This issue can lead to local privileges elevation on systems
where the X server is running privileged and remote code execution for
ssh X forwarding sessions.

* CVE-2023-0494/ZDI-CAN-19596: X.Org Server DeepCopyPointerClasses 

A dangling pointer in DeepCopyPointerClasses can be exploited by 
ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read/write into 
freed memory.

A patch for this issue has been committed to the xorg server git
repository. xorg-server 21.1.7 will be released shortly and will include
this patch.

- commit 0ba6d8c37071131a49790243cdac55392ecf71ec

  Xi: fix potential use-after-free in DeepCopyPointerClasses
  CVE-2023-0494, ZDI-CAN 19596


The vulnerabilities have been discovered by Jan-Niklas Sohn working with
Trend Micro Zero Day Initiative.
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