USN-6587-1: X.Org X Server vulnerabilities

Releases

• Ubuntu 23.10
• Ubuntu 23.04
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Packages

• 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

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

Ubuntu 20.04

• 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

• CVE-2024-21886
• CVE-2024-21885
• CVE-2024-0408
• CVE-2024-0409
• CVE-2023-6816
• CVE-2024-0229

Related notices

• USN-6587-2: xnest, xvfb, xdmx, xserver-common, xmir, xserver-xephyr, xorg-server-source, xorg-server, xserver-xorg-core, xwayland, xdmx-tools, xserver-xorg-legacy, xserver-xorg-xmir, xserver-xorg-dev
• USN-6587-5: xnest, xvfb, xdmx, xserver-common, xserver-xephyr, xorg-server-source, xorg-server, xserver-xorg-core, xdmx-tools, xserver-xorg-xmir, xserver-xorg-dev