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Ubuntu 18.04 LTS USN-6587-2: critical X.Org Server DoS threats

ubuntu
Calendar Grey January 22, 2024
Dist Ubuntu Esm H88
Multiple security flaws in the X.Org X Server have been addressed in Ubuntu releases 16.04 and 18.04 LTS. Immediate update is highly recommended.
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

Details:

USN-6587-1 fixed several vulnerabilities in X.Org. This update provides

the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

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

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security update software update Ubuntu X.Org

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+esm4
  xwayland                        2:1.19.6-1ubuntu4.15+esm4

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm9
  xwayland                        2:1.18.4-0ubuntu0.12+esm9

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

References

https://ubuntu.com/security/notices/USN-6587-2

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

CVE-2023-6816, CVE-2024-0229, CVE-2024-0408, CVE-2024-0409,

CVE-2024-21885, CVE-2024-21886

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6587-2

Topics%20covered

Topics Covered

security advisory denial of service security update software update Ubuntu X.Org

Package Information

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