Ubuntu 23.10: USN-6587-3 Moderate: Xorg-Server Regression Fix

ubuntu

January 30, 2024

A regression was fixed in X.Org X Server

Summary

A regression was fixed in X.Org X Server

Software Description:

- xorg-server: X.Org X11 server

- xwayland: X server for running X clients under Wayland

Details:

USN-6587-1 fixed vulnerabilities in X.Org X Server. The fix was incomplete

resulting in a possible regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled

memory when processing the DeviceFocusEvent and ProcXIQueryPointer APIs. An

attacker could possibly use this issue to cause the X Server to crash,

obtain sensitive information, or execute arbitrary code. (CVE-2023-6816)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled

reattaching to a different master device. An attacker could use this issue

to cause the X Server to crash, leading to a denial of service, or possibly

execute arbitrary code. (CVE-2024-0229)

Olivier Fourdan and Donn Se...

Read the Full Advisory

Topics Covered

security advisory denial of service moderate severity ubuntu regression xorg-server

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.10:
   xserver-xorg-core               2:21.1.7-3ubuntu2.7

Ubuntu 22.04 LTS:
   xserver-xorg-core               2:21.1.4-2ubuntu1.7~22.04.8
   xwayland                        2:22.1.1-1ubuntu0.11

Ubuntu 20.04 LTS:
   xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.15
   xwayland                        2:1.20.13-1ubuntu1~20.04.15

After a standard system update you need to reboot your computer to make all
the necessary changes.