The process_tgs_req function in do_tgs_req.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9 through 1.9.2 allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted TGS request that triggers an error other than the KRB5_KDB_NOENTRY error.
https://exchange.xforce.ibmcloud.com/vulnerabilities/71655
http://www.securityfocus.com/bid/50929
http://www.securityfocus.com/archive/1/520756/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2011-1790.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:184
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-007.txt