Doors of Durin: The Veiled Gate to Siemens S7 Silicon

Siemens is a leading provider of industrial automation components for critical infrastructures, and their S7 PLC series is one of the most widely used PLCs in the industry. In recent years, Siemens integrated various security measures into their PLCs, including firmware integrity verification at boot time using a separate bootloader code.

By Ali Abbasi, Tobias Scharnowski and Thorsten Holz