crtasmMicrosoft's 'unhackable' Xbox One has been hacked by 'Bliss'
Created a voltage drop that exactly occurred to be timed to the key comparison, then a spike at the continuation.
Irl noop and forced execution control flow to effectively return true.
B e a utiful
It's fascinating - how does one defend against an attacker or red-team who controls the CPU voltage rails with enough precision to bypass any instruction one writes? It's an entirely new class of vulnerability, as far as I can tell.
This talk https://www.youtube.com/watch?v=BBXKhrHi2eY indicates that others have had success doing this on Intel microcode as well - only in the past few months. Going to be some really exciting exploits coming out here!
m0leCon 2025 - Federico Cerutti - Voltage Glitching Intel Microcode
It's not new - fault injection as a vulnerability class has existed since the beginning of computing, as a security bypass mechanism (clock glitching) since at least the 1990s, and crowbar voltage glitching like this has been widespread since at least the early 2000s. It's extraordinarily hard to defend against but mitigations are also improving rapidly; for example this attack only works on early Xbox One revisions where more advanced glitch protection wasn't enabled (although the author speculates that since the glitch protection can be disabled via software / a fuse state, one could glitch out the glitch protection).