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Ubuntu 16.04, 18.04, 14.04 LTS USN-6168-2 Libx11 DoS Issue

ubuntu
Calendar Grey June 20, 2023
Dist Ubuntu Esm H88
Explore the USN-6168-2 notification regarding security flaws in libx11 that impact Ubuntu systems. Find out about the specifics of the update and its level of risk.
libx11 could be made to crash if it received specially crafted network traffic.

Summary

libx11 could be made to crash if it received specially crafted network

traffic.

Software Description:

- libx11: X11 client-side library

Details:

USN-6168-1 fixed a vulnerability in libx11. This update provides

the corresponding update for Ubuntu 14.04 ESM, Ubuntu 16.04 ESM,

and Ubuntu 18.04 ESM.

Original advisory details:

Gregory James Duck discovered that libx11 incorrectly handled certain

Request, Event, or Error IDs. If a user were tricked into connecting to a

malicious X Server, a remote attacker could possibly use this issue to

cause libx11 to crash, resulting in a denial of service.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu libx11 network issue

Update Instructions

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  libx11-6                        2:1.6.4-3ubuntu0.4+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  libx11-6                        2:1.6.3-1ubuntu2.2+esm2

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
  libx11-6                        2:1.6.2-1ubuntu2.1+esm3

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

References

https://ubuntu.com/security/notices/USN-6168-2

https://ubuntu.com/security/notices/USN-6168-1

CVE-2023-3138

Severity
critical
Lowest
Low
Medium
High
Critical

June 20, 2023

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu libx11 network issue

Package Information

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