USN-1843-1: GnuTLS vulnerability

Ubuntu Security Notice USN-1843-1

29th May, 2013

gnutls26 vulnerability

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

  • Ubuntu 13.04
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS


GnuTLS could be made to crash if it received specially crafted network traffic.

Software description

  • gnutls26 - GNU TLS library


It was discovered that GnuTLS incorrectly handled certain padding bytes. A
remote attacker could use this flaw to cause an application using GnuTLS to
crash, leading to a denial of service.

Update instructions

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

Ubuntu 13.04:
libgnutls26 2.12.23-1ubuntu1.1
Ubuntu 12.10:
libgnutls26 2.12.14-5ubuntu4.3
Ubuntu 12.04 LTS:
libgnutls26 2.12.14-5ubuntu3.4
Ubuntu 10.04 LTS:
libgnutls26 2.8.5-2ubuntu0.4

To update your system, please follow these instructions:

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