Ubuntu 22.10 USN-5846-1 Critical: X.Org X Server Escalation Issue

ubuntu

February 7, 2023

X.Org X Server could be made to crash or run programs as the administrator if it received specially crafted input.

Summary

X.Org X Server could be made to crash or run programs as the administrator

if it received specially crafted input.

Software Description:

- xorg-server: X.Org X11 server

- xwayland: X server for running X clients under Wayland

- xorg-server-hwe-18.04: X.Org X11 server

Details:

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

certain memory operations. An attacker could possibly use these issues to

cause the X Server to crash, execute arbitrary code, or escalate

privileges.

Topics Covered

security advisory critical privilege escalation Ubuntu input validation admin privileges X.Org X Server

Update Instructions

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

Ubuntu 22.10:
   xserver-xorg-core               2:21.1.4-2ubuntu1.5
   xwayland                        2:22.1.3-2ubuntu0.3

Ubuntu 22.04 LTS:
   xserver-xorg-core               2:21.1.3-2ubuntu2.7
   xwayland                        2:22.1.1-1ubuntu0.5

Ubuntu 20.04 LTS:
   xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.6
   xwayland                        2:1.20.13-1ubuntu1~20.04.6

Ubuntu 18.04 LTS:
   xserver-xorg-core               2:1.19.6-1ubuntu4.14
   xserver-xorg-core-hwe-18.04     2:1.20.8-2ubuntu2.2~18.04.10
   xwayland                        2:1.19.6-1ubuntu4.14
   xwayland-hwe-18.04              2:1.20.8-2ubuntu2.2~18.04.10

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