Ubuntu 23.10 USN-6587-1 critical: X.Org X Server DoS threats

ubuntu

January 16, 2024

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

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)

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Read the Full Advisory

Topics Covered

security advisory DoS issue Ubuntu X.Org xserver xwayland

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.