==========================================================================
Ubuntu Security Notice USN-6721-2
April 09, 2024

xorg-server, xwayland regression
==========================================================================

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

- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

A regression was fixed in X.Org X Server.

Software Description:
- xorg-server: X.Org X11 server
- xwayland: X server for running X clients under Wayland

Details:

USN-6721-1 fixed vulnerabilities in X.Org X Server. That fix was incomplete
resulting in a regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that X.Org X Server incorrectly handled certain data.
 An attacker could possibly use this issue to expose sensitive information.
 (CVE-2024-31080, CVE-2024-31081, CVE-2024-31082)

 It was discovered that X.Org X Server incorrectly handled certain glyphs.
 An attacker could possibly use this issue to cause a crash or expose sensitive
 information. (CVE-2024-31083)

Update instructions:

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

Ubuntu 23.10:
  xserver-xorg-core               2:21.1.7-3ubuntu2.9
  xwayland                        2:23.2.0-1ubuntu0.6

Ubuntu 22.04 LTS:
  xserver-xorg-core               2:21.1.4-2ubuntu1.7~22.04.10
  xwayland                        2:22.1.1-1ubuntu0.13

Ubuntu 20.04 LTS:
  xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.17
  xwayland                        2:1.20.13-1ubuntu1~20.04.17

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.19.6-1ubuntu4.15+esm8
  xwayland                        2:1.19.6-1ubuntu4.15+esm8

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm13
  xwayland                        2:1.18.4-0ubuntu0.12+esm13

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.15.1-0ubuntu2.11+esm12

After a standard system update you need to restart -APP- to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-6721-2
  https://ubuntu.com/security/notices/USN-6721-1
  https://launchpad.net/bugs/2060354

Package Information:
  https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.7-3ubuntu2.9
  https://launchpad.net/ubuntu/+source/xwayland/2:23.2.0-1ubuntu0.6
  https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.7~22.04.10
  https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.13
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.17