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Ubuntu 18.04 LTS USN-6453-2 Critical: X.Org Exec Risk Fixes

ubuntu
Calendar Grey October 31, 2023
Dist Ubuntu Esm H88
Receive updates on X.Org X Server vulnerabilities in Ubuntu with critical fixes for elevated risk and security measures.
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

Details:

USN-6453-1 fixed several vulnerabilities in X.Org. This update provides

the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and

Ubuntu 18.04 LTS.

Original advisory 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%20covered

Topics Covered

security advisory ubuntu execution risk xorg-server xwayland

Update Instructions

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.19.6-1ubuntu4.15+esm1
  xwayland                        2:1.19.6-1ubuntu4.15+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm6
  xwayland                        2:1.18.4-0ubuntu0.12+esm6

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.15.1-0ubuntu2.11+esm8

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

References

https://ubuntu.com/security/notices/USN-6453-2

https://ubuntu.com/security/notices/USN-6453-1

CVE-2023-5367, CVE-2023-5380

Severity
critical
Lowest
Low
Medium
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Critical

Ubuntu Security Notice USN-6453-2

Topics%20covered

Topics Covered

security advisory ubuntu execution risk xorg-server xwayland

Package Information

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