KTH Kerberos IV allows local users to change the configuration of a Kerberos server running at an elevated privilege by specifying an alternate directory using with the KRBCONFDIR environmental variable, which allows the user to gain additional privileges.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5738
http://archives.neohapsis.com/archives/bugtraq/2000-12/0105.html