Ubuntu alert USN-4966-2 (libx11)

From:
             
 
"Leonidas S. Barbosa" <leo.barbosa@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-4966-2] libx11 vulnerability
Date:
             
 
Tue, 25 May 2021 16:31:21 -0300
Message-ID:
             
 
<20210525193121.GA1237794@d4rkl41n>
==========================================================================
Ubuntu Security Notice USN-4966-2
May 25, 2021

libx11 vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

libx11 could allow unintended access to services.

Software Description:
- libx11: X11 client-side library

Details:

USN-4966-1 fixed a vulnerability in libx11. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory 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.

Update instructions:

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

Ubuntu 16.04 ESM:
  libx11-6                        2:1.6.3-1ubuntu2.2+esm1

Ubuntu 14.04 ESM:
  libx11-6                        2:1.6.2-1ubuntu2.1+esm2

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

References:
  https://ubuntu.com/security/notices/USN-4966-2
  https://ubuntu.com/security/notices/USN-4966-1
  CVE-2021-31535
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