USN-948-1: GnuTLS vulnerability

3 June 2010

gnutls12 vulnerability

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

  • Ubuntu 6.06 LTS


Under certain circumstances, an attacker might be able to crash GnuTLS.

Software Description

  • gnutls12 - the GNU TLS library


It was discovered that GnuTLS did not always properly verify the hash algorithm of X.509 certificates. If an application linked against GnuTLS processed a crafted certificate, an attacker could make GnuTLS dereference a NULL pointer and cause a DoS via application crash.

Update instructions

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

Ubuntu 6.06 LTS
libgnutls12 - 1.2.9-2ubuntu1.8

To update your system, please follow these instructions:

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