Explore security vulnerabilities in mixed Kerberos environments through this DEF CON 31 conference talk that examines the problematic relationship between Windows Active Directory and MIT/Heimdal Kerberos stacks. Learn how differences in user identification methods between Microsoft's implementation and Linux/Unix systems can be exploited for privilege escalation attacks. Discover practical demonstrations of these security weaknesses, including how Active Directory configuration flaws can be leveraged to compromise Linux-based hosts within the same realm. Get introduced to new attack techniques using an updated version of the Rubeus tool, designed specifically to exploit these cross-platform authentication vulnerabilities.