Ubuntu 23.10: USN-6555-1 critical: X.Org X Server security issue

ubuntu

December 13, 2023

Several security issues were fixed in X.Org X Server.

Summary

Several security issues were fixed in X.Org X Server.

Software Description:

- xorg-server: X.Org X11 server

- xwayland: X server for running X clients under Wayland

Details:

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

button actions. An attacker could possibly use this issue to cause the X

Server to crash, execute arbitrary code, or escalate privileges.

(CVE-2023-6377)

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

memory when processing the RRChangeOutputProperty and

RRChangeProviderProperty APIs. An attacker could possibly use this issue to

cause the X Server to crash, or obtain sensitive information.

(CVE-2023-6478)

Topics Covered

security advisory buffer overflow critical arbitrary code execution Ubuntu X.Org

Update Instructions

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

Ubuntu 23.10:
   xserver-xorg-core               2:21.1.7-3ubuntu2.4
   xwayland                        2:23.2.0-1ubuntu0.3

Ubuntu 23.04:
   xserver-xorg-core               2:21.1.7-1ubuntu3.4
   xwayland                        2:22.1.8-1ubuntu1.3

Ubuntu 22.04 LTS:
   xserver-xorg-core               2:21.1.4-2ubuntu1.7~22.04.5
   xwayland                        2:22.1.1-1ubuntu0.9

Ubuntu 20.04 LTS:
   xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.12
   xwayland                        2:1.20.13-1ubuntu1~20.04.12

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