Explore the fascinating world of mainframe hacking in this 35-minute conference talk from Hack in Paris. Discover how to penetrate one of the most secure platforms on earth, powering critical business functions worldwide. Learn methods for pentesting mainframe applications, deploying shells, and elevating privileges on the system, all starting with zero authentication. Gain insights into the vulnerabilities of these mammoth systems that handle wire transfers, ATM withdrawals, and flight bookings. Whether you're a mainframe enthusiast or simply curious about what a shell looks like on MVS, this talk offers a unique perspective on cybersecurity challenges in legacy systems.