Ubuntu alert USN-4967-2 (nginx)

From:
             
 
"Leonidas S. Barbosa" <leo.barbosa@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-4967-2] nginx vulnerability
Date:
             
 
Thu, 27 May 2021 10:55:46 -0300
Message-ID:
             
 
<20210527135546.GA3666870@d4rkl41n>
==========================================================================
Ubuntu Security Notice USN-4967-2
May 27, 2021

nginx vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

nginx could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- nginx: small, powerful, scalable web/proxy server

Details:

USN-4967-1 fixed a vulnerability in nginx. This update provides
the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

 Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx
 incorrectly handled responses to the DNS resolver. A remote attacker could
 use this issue to cause nginx to crash, resulting in a denial of service,
 or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 16.04 ESM:
  nginx                           1.10.3-0ubuntu0.16.04.5+esm1
  nginx-common                    1.10.3-0ubuntu0.16.04.5+esm1
  nginx-core                      1.10.3-0ubuntu0.16.04.5+esm1
  nginx-extras                    1.10.3-0ubuntu0.16.04.5+esm1
  nginx-full                      1.10.3-0ubuntu0.16.04.5+esm1
  nginx-light                     1.10.3-0ubuntu0.16.04.5+esm1

Ubuntu 14.04 ESM:
  nginx                           1.4.6-1ubuntu3.9+esm2
  nginx-common                    1.4.6-1ubuntu3.9+esm2
  nginx-core                      1.4.6-1ubuntu3.9+esm2
  nginx-extras                    1.4.6-1ubuntu3.9+esm2
  nginx-full                      1.4.6-1ubuntu3.9+esm2
  nginx-light                     1.4.6-1ubuntu3.9+esm2

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4967-2
  https://ubuntu.com/security/notices/USN-4967-1
  CVE-2021-23017
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