==========================================================================
Ubuntu Security Notice USN-6587-1
January 16, 2024

xorg-server, xwayland vulnerabilities
==========================================================================

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

- Ubuntu 23.10
- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in X.Org X Server.

Software Description:
- 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
memory when processing the DeviceFocusEvent and ProcXIQueryPointer APIs. An
attacker could possibly use this issue to cause the X Server to crash,
obtain sensitive information, or execute arbitrary code. (CVE-2023-6816)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
reattaching to a different master device. An attacker could use this issue
to cause the X Server to crash, leading to a denial of service, or possibly
execute arbitrary code. (CVE-2024-0229)

Olivier Fourdan and Donn Seeley discovered that the X.Org X Server
incorrectly labeled GLX PBuffers when used with SELinux. An attacker could
use this issue to cause the X Server to crash, leading to a denial of
service. (CVE-2024-0408)

Olivier Fourdan discovered that the X.Org X Server incorrectly handled
the curser code when used with SELinux. An attacker could use this issue to
cause the X Server to crash, leading to a denial of service.
(CVE-2024-0409)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
memory when processing the XISendDeviceHierarchyEvent API. An attacker
could possibly use this issue to cause the X Server to crash, or execute
arbitrary code. (CVE-2024-21885)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
devices being disabled. An attacker could possibly use this issue to cause
the X Server to crash, or execute arbitrary code. (CVE-2024-21886)

Update instructions:

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

Ubuntu 23.10:
   xserver-xorg-core               2:21.1.7-3ubuntu2.6
   xwayland                        2:23.2.0-1ubuntu0.4

Ubuntu 23.04:
   xserver-xorg-core               2:21.1.7-1ubuntu3.6
   xwayland                        2:22.1.8-1ubuntu1.4

Ubuntu 22.04 LTS:
   xserver-xorg-core               2:21.1.4-2ubuntu1.7~22.04.7
   xwayland                        2:22.1.1-1ubuntu0.10

Ubuntu 20.04 LTS:
   xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.14
   xwayland                        2:1.20.13-1ubuntu1~20.04.14

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

References:
   https://ubuntu.com/security/notices/USN-6587-1
   CVE-2023-6816, CVE-2024-0229, CVE-2024-0408, CVE-2024-0409,
   CVE-2024-21885, CVE-2024-21886

Package Information:
   https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.7-3ubuntu2.6
   https://launchpad.net/ubuntu/+source/xwayland/2:23.2.0-1ubuntu0.4
   https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.7-1ubuntu3.6
   https://launchpad.net/ubuntu/+source/xwayland/2:22.1.8-1ubuntu1.4
   https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.7~22.04.7
   https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.10
   https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.14