[USN-5846-1] X.Org X Server vulnerability

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-5846-1
February 07, 2023

xorg-server, xorg-server-hwe-18.04, xwayland vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

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.

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.

References:
   https://ubuntu.com/security/notices/USN-5846-1
   CVE-2023-0494

Package Information:
   https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.5
   https://launchpad.net/ubuntu/+source/xwayland/2:22.1.3-2ubuntu0.3
   https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.3-2ubuntu2.7
   https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.5
   https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.6
   https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.6-1ubuntu4.14
 
https://launchpad.net/ubuntu/+source/xorg-server-hwe-18.04/2:1.20.8-2ubuntu2.2~18.04.10
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