Ubuntu alert USN-4487-2 (libx11)

From:
             
 
"Leonidas S. Barbosa" <leo.barbosa@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-4487-2] libx11 vulnerabilities
Date:
             
 
Tue, 08 Sep 2020 13:53:31 -0300
Message-ID:
             
 
<20200908165331.GA1688380@d4rkl41n>
==========================================================================
Ubuntu Security Notice USN-4487-2
September 08, 2020

libx11 vulnerabilities
==========================================================================

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in libx11.

Software Description:
- libx11: None

Details:

USN-4487-1 fixed several vulnerabilities in libx11. This update provides
the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.

Original advisory details:

 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.
 (CVE-2020-14363)

Update instructions:

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

Ubuntu 14.04 ESM:
  libx11-6                        2:1.6.2-1ubuntu2.1+esm1

Ubuntu 12.04 ESM:
  libx11-6                        2:1.4.99.1-0ubuntu2.5

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

References:
  https://usn.ubuntu.com/4487-2
  https://usn.ubuntu.com/4487-1
  CVE-2020-14344, CVE-2020-14363
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