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Ubuntu 18.04 & 16.04 LTS: USN-6587-4 Critical X.Org Server Issues

ubuntu
Calendar Grey February 1, 2024
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-6588-5 highlights an issue in the OpenSSL library impacting various versions.
A regression was fixed in X.Org X Server.

Summary

A regression was fixed in X.Org X Server.

Software Description:

- xorg-server: X.Org X11 server

Details:

USN-6587-1 fixed vulnerabilities in X.Org X Server. The fix was incomplete

resulting in a possible regression. This update fixes the problem.

Original advisory 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 ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service update instructions ubuntu xorg-server

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+esm5
  xwayland                        2:1.19.6-1ubuntu4.15+esm5

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm10
  xwayland                        2:1.18.4-0ubuntu0.12+esm10

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

References

https://ubuntu.com/security/notices/USN-6587-4

https://ubuntu.com/security/notices/USN-6587-1

Severity
critical
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Critical

Ubuntu Security Notice USN-6587-4

Topics%20covered

Topics Covered

security advisory denial of service update instructions ubuntu xorg-server

Package Information

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