Oven Repair (The Hardware Hacking Way)

Cooking a turkey one (Canadian) Thanksgiving, Colin's oven displayed a 325F temperature, but the turkey took hours longer than expected! Thus began the realization his oven lies to him – and the temperature is often much cooler than claimed.

The Samsung oven in question has this as a common complaint online, but without a solution. The solution it turns out involves a little more than is covered in the oven service manual: low-level hardware attacks in the form of side-channel power analysis and fault injection, building tools to work with the TMP91 microcontroller bootloader, and finally reverse engineering and patching the firmware in the oven. The result saved Colin's oven from becoming e-waste, and can help others repair a variety of older electronics using these (obsolete but still widely deployed) TMP91 (TLCS-900/L1) microcontrollers....

By: Colin O'Flynn

Full Abstract and Presentation Materials: https://www.blackhat.com/us-23/briefi...