Breaking through crypto security
There are three levels of security available for the microcontroller used in Trezor wallets — RDP2, the most secure, which doesn’t let you read the RAM, and RDP1 and RDP0, which do. Trezor wallets are configured to use RDP2 to prevent someone from reading the RAM, among other things.
The only problem was the glitching required thousands of tries — powering up the wallet repeatedly and using different parameters to affect the voltage to the microcontroller each time, in an attempt to hit the exact moment that would let him downgrade the microcontroller’s security. It took three to four hours using an automated script, and there was no guarantee it would work on Reich’s wallet, even if it worked on the practice wallets.
He immediately moved the Theta tokens out of their account and sent a percentage of the booty to Grand for his services. But Grand doesn’t want to just crack wallets — he also wants to help make them more secure. He plans to report vulnerabilities he finds to the vendor when they’re patchable, so they can’t be exploited by criminals or others who might seize an owner’s wallet. Does this mean he’ll run out of vulnerabilities to hack at some point?
Trezor already fixed part of the problem Grand exploited in later versions of its firmware. The wallets no longer copy or move the key and PIN into RAM at all. Pavol Rusnak, co-founder and CTO of SatoshiLabs, which makes Trezor wallets, said it now stores them in a protected part of flash that isn’t affected during firmware upgrades.
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