lib/x509/verify.c in GnuTLS before 3.1.22 and 3.2.x before 3.2.12 does not properly handle unspecified errors when verifying X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers via a crafted certificate.
http://gnutls.org/security.html#GNUTLS-SA-2014-2
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00020.html
http://rhn.redhat.com/errata/RHSA-2014-0246.html
http://rhn.redhat.com/errata/RHSA-2014-0247.html
http://rhn.redhat.com/errata/RHSA-2014-0288.html
http://rhn.redhat.com/errata/RHSA-2014-0339.html
http://secunia.com/advisories/56933
http://secunia.com/advisories/57103
http://secunia.com/advisories/57204
http://secunia.com/advisories/57254
http://secunia.com/advisories/57260
http://secunia.com/advisories/57274
http://secunia.com/advisories/57321
http://www.debian.org/security/2014/dsa-2869
http://www.securityfocus.com/bid/65919