Ubuntu 21.04: USN-4966-1 Moderate: libx11 Remote Access

ubuntu

May 25, 2021

libx11 could allow unintended access to services.

Summary

libx11 could allow unintended access to services.

Software Description:

- libx11: X11 client-side library

Details:

It was discovered that libx11 incorrectly validated certain parameter

lengths. A remote attacker could possibly use this issue to trick libx11

into emitting extra X protocol requests.

Topics Covered

security advisory remote access moderate severity update instructions ubuntu libx11 service access

Update Instructions

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

Ubuntu 21.04:
  libx11-6                        2:1.7.0-2ubuntu0.1

Ubuntu 20.10:
  libx11-6                        2:1.6.12-1ubuntu0.1

Ubuntu 20.04 LTS:
  libx11-6                        2:1.6.9-2ubuntu1.2

Ubuntu 18.04 LTS:
  libx11-6                        2:1.6.4-3ubuntu0.4

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