Ledger Researchers Break RP2350 Secure Debug Using Laser Fault Injection

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Security researchers at Ledger's Donjon lab have demonstrated a method to bypass the secure debug protections on Raspberry Pi's RP2350 microcontroller. The technique, called Photon-Emission-Guided Laser Fault Injection, uses emitted light from the chip to precisely locate and target vulnerable transistors with a laser. By inducing carefully timed faults, the researchers were able to unlock secure debug access that is normally restricted. The findings highlight a hardware-level vulnerability relevant to embedded security and chip designers. Ledger published a detailed technical writeup on the method via their security research blog.

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