Ubuntu Security Notice USN-2121-1
25th February, 2014
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.
- 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
The problem can be corrected by updating your system to the following package version:
- 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: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.