PC Master Race

lol

Microsoft:

In the meantime, Microsoft recommends changing BitLocker’s configuration on encrypted devices from TPM-only mode to TPM+PIN mode using PowerShell, the command line, or the Control Panel. This adjustment requires a pre-boot PIN to decrypt the drive at startup and is expected to block YellowKey attacks.

Chaotic Eclipse posted the following with the disclosure of Yellowkey:

Second thing is, No, TPM+PIN does not help, the issue is still exploitable regardless, I asked myself this question, can it still work in a TPM+PIN environment ? Yes it does, I'm just not publishing the PoC, I think what's out there is already bad enough.

Additional info:

The YellowKey is caused by the binary "autofstx.exe" which propagates all present volumes for transaction files, a researcher (unsure if they want to be named) told me that this binary is also present in windows update WinRE images and I think they will definitely have the same vulnerability as well. However, I'm unsure if it's possible to trigger the controlled file deletion when windows is updating. If it's true, then it means disabling WinRE is not a solution for the problem, which also means it's a good thing that I kept the PIN+TPM PoC a secret.

And as response to this:

"Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as "YellowKey". The proof of concept for this vulnerability has been made public violating coordinated vulnerability best practices."

They posted:

Saying that I violated CVD best practices is a defamation of my personal reputation, you already told me you will defaming me and doing it in public will not help dissolve this conflict. You intentionally revoked my access to my MSRC account that I used to report vulnerabilities to you, when I asked you, you went ahead and completely wiped the account from existance despite multiple attempts from asking for an explanation. All of those requests went unanswered by the MSRC leadership.

I'm taking your statement very personally.

I have to say, i'm a fan.

Edit: The story so far would probably be well suited for an anime adaption. I hope we learn someday what shit MS pulled to make our friendly neighborhood security researcher so pissed that they started a one-person-crusade against one of the largest IT companies in the world.