[USN-4487-1] libx11 vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Wed Sep 2 13:46:41 UTC 2020

Ubuntu Security Notice USN-4487-1
September 02, 2020

libx11 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS


Several security issues were fixed in libx11.

Software Description:
- libx11: None


Todd Carson discovered that libx11 incorrectly handled certain memory
operations. A local attacker could possibly use this issue to escalate
privileges. (CVE-2020-14344)

Jayden Rivers discovered that libx11 incorrectly handled locales. A local
attacker could possibly use this issue to escalate privileges.

Update instructions:

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

Ubuntu 20.04 LTS:
  libx11-6                        2:1.6.9-2ubuntu1.1

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

Ubuntu 16.04 LTS:
  libx11-6                        2:1.6.3-1ubuntu2.2

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

  CVE-2020-14344, CVE-2020-14363

Package Information:

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