Ubuntu: USN-2697-2 Critical: Remote Vulnerability in GnuTLS26 Padding

It was discovered that a malicious client could crash a GNUTLS server
and vice versa, by sending TLS records encrypted with a block cipher
which contain invalid padding.

The oldstable distribution (squeeze) is not affected because the
security fix that introduced this vulnerability was not applied to it.

For the stable distribution (wheezy), this problem has been fixed in
version 2.12.20-7.

For the unstable distribution (sid), this problem has been fixed in
version 2.12.23-5.

We recommend that you upgrade your gnutls26 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/