Debian Linux Security Advisory 2052-1 – Shawn Emery discovered that in MIT Kerberos 5 (krb5), a system for authenticating users and services on a network, a null pointer dereference flaw in the Generic Security Service Application Program Interface (GSS-API) library could allow an authenticated remote attacker to crash any server application using the GSS-API authentication mechanism, by sending a specially-crafted GSS-API token with a missing checksum field.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/89915/dsa-2052-1.txt
Source: https://packetstormsecurity.com/files/89915/Debian-Linux-Security-Advisory-2052-1.html