USN-6555-1: 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 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)

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

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

Ubuntu 20.04

• 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.

References

• CVE-2023-6377
• CVE-2023-6478

Related notices

• USN-6555-2: xserver-common, xserver-xorg-xmir, xmir, xnest, xorg-server, xwayland, xserver-xorg-dev, xvfb, xserver-xorg-core, xserver-xorg-legacy, xserver-xephyr, xorg-server-source, xdmx, xdmx-tools
• USN-6587-5: xserver-common, xserver-xorg-xmir, xnest, xorg-server, xserver-xorg-dev, xvfb, xserver-xorg-core, xserver-xephyr, xorg-server-source, xdmx, xdmx-tools