The Heimdal package is a free Kerberos implementation offering flexible authentication mechanisms based on the Kerberos 5 and Kerberos 4 scheme. The SuSE Security Team has reviewed critical parts of the Heimdal package such as the kadmind and kdc server. While doing so several possible buffer overflows and other bugs have been uncovered and fixed. Remote attackers can probably gain remote root access on unpatched systems. Since these services run usually on authentication servers we consider these bugs to be very serious. An update is strongly recommended if you are using the Heimdal package.