USN-2121-1: GnuTLS vulnerability

25 February 2014

gnutls26 vulnerability

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

  • Ubuntu 13.10
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS


GnuTLS incorrectly validated certain intermediate certificates.

Software Description

  • gnutls26 - GNU TLS library


Suman Jana discovered that GnuTLS incorrectly handled version 1 intermediate certificates. This resulted in them being considered to be a valid CA certificate by default, which was contrary to documented behaviour.

Update instructions

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

Ubuntu 13.10
libgnutls26 - 2.12.23-1ubuntu4.1
Ubuntu 12.10
libgnutls26 - 2.12.14-5ubuntu4.5
Ubuntu 12.04 LTS
libgnutls26 - 2.12.14-5ubuntu3.6

To update your system, please follow these instructions:

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