USN-2127-1: GnuTLS vulnerability

4 March 2014

gnutls26 vulnerability

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

  • Ubuntu 13.10
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS


Fraudulent security certificates could allow sensitive information to be exposed when accessing the Internet.

Software Description

  • gnutls26 - GNU TLS library


Nikos Mavrogiannopoulos discovered that GnuTLS incorrectly handled certificate verification functions. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could be exploited with specially crafted certificates to view sensitive information.

Update instructions

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

Ubuntu 13.10
libgnutls26 - 2.12.23-1ubuntu4.2
Ubuntu 12.10
libgnutls26 - 2.12.14-5ubuntu4.6
Ubuntu 12.04 LTS
libgnutls26 - 2.12.14-5ubuntu3.7
Ubuntu 10.04 LTS
libgnutls26 - 2.8.5-2ubuntu0.5

To update your system, please follow these instructions:

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