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Ubuntu Security Notice USN-4966-2

Ubuntu Security Notice USN-4966-2
Posted May 26, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4966-2 - USN-4966-1 fixed a vulnerability in libx11. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. 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. Various other issues were also addressed.

tags | advisory, remote, protocol
systems | linux, ubuntu
advisories | CVE-2021-31535
SHA-256 | e0eccd0078f94c572c12f091d36b0db2460e273ee382a10a61f2960180a695e1

Ubuntu Security Notice USN-4966-2

Change Mirror Download
=========================================================================
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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