Excellent tutorial on implementation. Contains detailed steps to follow for a successful installation, as well as answers to common questions. http://www.ornl.gov/~jar/HowToKerb.html
"Multiple Kerberos distributions contain a remotely exploitable buffer overflow in the Kerberos administration daemon. A remote attacker could exploit this vulnerability to gain root privileges on a vulnerable system." http://www.cert.org/advisories/CA-2002-29.html
Provides products for database security, web security, and security infrastructure based on the Kerberos protocol, and also provides Kerberos consulting and support. http://www.cybersafe.ltd.uk