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Ubuntu 18.04 & 16.04 USN-6555-2 critical: X.Org X Server exploits

ubuntu
Calendar Grey December 13, 2023
Dist Ubuntu Esm H88
The X.Org X Server team has implemented a significant update for Ubuntu 16.04 and 18.04 LTS, fixing critical vulnerabilities.
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-6555-1 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 XKB

button actions. An attacker could possibly use this issue to cause the X

Server to crash, execute arbitrary code, or escalate privileges.

(CVE-2023-6377)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled

memory when processing the RRChangeOutputProperty and

RRChangeProviderProperty APIs. An attacker could possibly use this issue to

cause the X Server to crash, or obtain sensitive information.

(CVE-2023-6478)

Topics%20covered

Topics Covered

security advisory arbitrary code execution information disclosure ubuntu escalation xorg

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+esm3
  xwayland                        2:1.19.6-1ubuntu4.15+esm3

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm8
  xwayland                        2:1.18.4-0ubuntu0.12+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-6555-2

https://ubuntu.com/security/notices/USN-6555-1

CVE-2023-6377, CVE-2023-6478

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6555-2

Topics%20covered

Topics Covered

security advisory arbitrary code execution information disclosure ubuntu escalation xorg

Package Information

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