USN-5193-1: X.Org X Server vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• xorg-server - X.Org X11 server
• xorg-server-hwe-18.04 - X.Org X11 server
• xwayland - Xwayland X server

Details

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
certain inputs. An attacker could use this issue to cause the server to
crash, resulting in a denial of service, or possibly execute arbitrary
code and escalate privileges.

Update instructions

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

Ubuntu 21.10

• xserver-xorg-core - 2:1.20.13-1ubuntu1.1
• xwayland - 2:21.1.2-0ubuntu1.1

Ubuntu 21.04

• xserver-xorg-core - 2:1.20.11-1ubuntu1.2
• xwayland - 2:21.1.1-0ubuntu1.1

Ubuntu 20.04

• xserver-xorg-core - 2:1.20.13-1ubuntu1~20.04.2

Ubuntu 18.04

• xserver-xorg-core - 2:1.19.6-1ubuntu4.10
• xserver-xorg-core-hwe-18.04 - 2:1.20.8-2ubuntu2.2~18.04.6

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

References

• CVE-2021-4008
• CVE-2021-4010
• CVE-2021-4011
• CVE-2021-4009

Related notices

• USN-5193-2: xserver-xorg-dev, xvfb, xserver-xephyr, xorg-server-source, xwayland, xserver-xorg-core, xserver-xorg-xmir, xdmx-tools, xorg-server, xdmx, xserver-common, xmir, xserver-xorg-legacy, xnest
• USN-5193-3: xwayland-hwe-16.04, xserver-xephyr-hwe-16.04, xserver-xorg-dev-hwe-16.04, xorg-server-hwe-16.04, xorg-server-source-hwe-16.04, xserver-xorg-core-hwe-16.04, xserver-xorg-legacy-hwe-16.04, xmir-hwe-16.04