Cornballer comments on Microsoft BitLocker-protected drives can now be opened with just some files on a USB stick — YellowKey zero-day exploit demonstrates an apparent backdoor

[–] Cornballer@lemmy.zip 49 points 5 months ago* (5 children)

Somebody on twitter “reverse engineered” the exploit. Apparently ms shipped debug code in production. At least it’s not called Backdoor_FBI outright.

How it works:

Recovery tools look for a config file called RecoverySimulation.ini on the OS drive

If Active=Yes, it enables "test mode" for the recovery tools

Test mode unlocks your BitLocker drive but a flag called FailRelock tells it to skip relocking

cmd.exe spawns with full access to your "encrypted" drive

permalink

fedilink

source

hideshow 5 child comments

[–] BigDanishGuy@sh.itjust.works 18 points 5 months ago (2 children)

Does test mode unlock without the key?!? So it's just "encrypted" with a generic key, and the unlock key is for authentication? That sounds insane, even for microsoft.

permalink

fedilink

source

parent

hideshow 2 child comments

[–] mavu@discuss.tchncs.de 13 points 5 months ago (1 child)

this works because the bitlocker key is stored in the TPM of the mainboard on the computer.
That is neccessary for the computer to be able to boot without entering your bitlocker password. you can configure it differently, but that is not default or super obvious to do.

permalink

fedilink

source

parent

hideshow 1 child comment

[–] RamRabbit@lemmy.world 4 points 5 months ago*

It always struck me as...poor...to not require a password for decryption. If you require zero knowlege from me, that means a stolen has everything inside needed to decrypt all the data.

And well, lookie there at the article!

permalink

fedilink

source

parent