ROOT SHELL ON CREDIT CARD TERMINAL

Summary from the TLDR Web Dev newsletter

This dev reverse-engineered a Worldline Yomani XR credit card terminal and found it had surprisingly weak security despite hardware tamper protections. He discovered a root shell accessible via a debug port, even from outside the device without triggering tamper detection. However, the vulnerable Linux system appears isolated from the secure processor handling sensitive card data, which limits the potential damage.