Ubuntu 23.10 USN-6453-1 High: X.Org X Server Buffer Overflow

ubuntu

October 25, 2023

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

Summary

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

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

prepending values to certain properties. An attacker could possibly use

this issue to cause the X Server to crash, execute arbitrary code, or

escalate privileges. (CVE-2023-5367)

Sri discovered that the X.Org X Server incorrectly handled detroying

windows in certain legacy multi-screen setups. An attacker could possibly

use this issue to cause the X Server to crash, execute arbitrary code, or

escalate privileges. (CVE-2023-5380)

Topics Covered

security advisory privilege escalation Ubuntu arbitrary code xorg-server xwayland

Update Instructions

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

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

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

Ubuntu 22.04 LTS:
   xserver-xorg-core               2:21.1.4-2ubuntu1.7~22.04.2
   xwayland                        2:22.1.1-1ubuntu0.7

Ubuntu 20.04 LTS:
   xserver-xorg-core               2:1.20.13-1ubuntu1~20.04.9
   xwayland                        2:1.20.13-1ubuntu1~20.04.9

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