Affected scope
Trezor One before firmware 1.8.0; USB descriptor handling
What the attack requires
Physical access and electromagnetic fault-injection equipment.
What changed
Trezor One 1.8.0 closed this attack path. Model T 2.1.0 received the same defensive measures although it was not directly affected.
What this finding establishes
Colin O’Flynn presented this work at Black Hat USA 2019. It is distinct from wallet.fail and Kraken’s 2020 disclosure.