USN-6453-1: X.Org X Server vulnerabilities

Releases

• Ubuntu 23.10
• Ubuntu 23.04
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Packages

• 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
prepending values to certain properties. An attacker could possibly use
this issue to cause the X Server to crash, execute arbitrary code, or
escalate privileges. (CVE-2023-5367)

Sri discovered that the X.Org X Server incorrectly handled detroying
windows in certain legacy multi-screen setups. An attacker could possibly
use this issue to cause the X Server to crash, execute arbitrary code, or
escalate privileges. (CVE-2023-5380)

Update instructions

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

Ubuntu 23.10

• xserver-xorg-core - 2:21.1.7-3ubuntu2.1
• xwayland - 2:23.2.0-1ubuntu0.1

Ubuntu 23.04

• xserver-xorg-core - 2:21.1.7-1ubuntu3.1
• xwayland - 2:22.1.8-1ubuntu1.1

Ubuntu 22.04

• xserver-xorg-core - 2:21.1.4-2ubuntu1.7~22.04.2
• xwayland - 2:22.1.1-1ubuntu0.7

Ubuntu 20.04

• xserver-xorg-core - 2:1.20.13-1ubuntu1~20.04.9
• xwayland - 2:1.20.13-1ubuntu1~20.04.9

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

References

• CVE-2023-5367
• CVE-2023-5380

Related notices

• USN-6453-2: xwayland, xserver-xorg-dev, xmir, xorg-server-source, xserver-common, xnest, xdmx-tools, xserver-xephyr, xorg-server, xserver-xorg-core, xserver-xorg-legacy, xdmx, xserver-xorg-xmir, xvfb