Follow me on a journey where we p0wn one of the most secure platforms on earth. A giant mammoth that still powers the most critical business functions around the world: The Mainframe! Be it a wire transfer, an ATM withdrawal, or a flight booking, you can be sure that you've used the trusted services of a Mainframe at least once during the last 24 hours. In this talk, I will present methods of privilege escalation on IBM z/OS: How to leverage a simple access to achieve total control over the machine and impersonate other users. If you are interested in mainframes or merely curious to see a what a shell looks like on MVS, you're welcome to tag along.