[33c3 TLDR] Do as I Say not as I Do: Stealth Modification of Programmable Logic Controllers I/O by Pin Control Attack

This talk was about how to abuse a design peculiarity in PLCs. It is used to change the behavior of the controllers by simply changing the configuration of the I/O pins.

For example, switching a pin from output to input will suppress all writing to that pin without any feedback.

Video