The DTLS implementation in GnuTLS 3.0.10 and earlier executes certain error-handling code only if there is a specific relationship between a padding length and the ciphertext size, which makes it easier for remote attackers to recover partial plaintext via a timing side-channel attack, a related issue to CVE-2011-4108.
http://www.isg.rhul.ac.uk/~kp/dtls.pdf
http://secunia.com/advisories/57260
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html