Took me a few hours to figure this out, figured I’d pass it along. Forgive formatting, I’m on mobile.
How to Bypass Bitlocker for Crowdstrike BSoD
Only use this if the Bitlocker key is lost.
From the Bitlocker screen, select Skip This Drive. A command prompt will appear.
Type bcdedit /set {default} safeboot network and press Enter.
Type Exit to exit the command prompt, then select Shut Down
Hardwire the device to the network
Login as an admin account
Navigate to C:\Windows\System32\Drivers\Crowdstrike and delete C:\windows\system32\drivers\crowdstrike\c-00000291-*.sys
Win+R to open the Run menu, then type msconfig and press Enter
Go to Boot
Uncheck the box for SafeBoot
You will receive a warning about Bitlocker. Proceed.
Click OK and you will be prompted to restart. Do so.
Have the user login
Test their access to files
So if this works it means bitlocker is useless.
Cute.
Edit: use a pin to unlock the bootloader kids.
Howso? It still requires authentication, same as if the laptop booted normally.
It means the drive isn’t fully encrypted or the encryption is easy to bypass. That defeats the purpose of encrypting your drive.
If you can get to a login screen, you’ve compromised the device.
Are you under the impression that you have to enter a Bitlocker key during each boot?
No, this means the recovery key or other external unlocks have been lost, but the TPM chip is still working correctly to provide the bitlocker key during boot.
This is not bypassing bitlocker, simply bypassing loading the bsod causing crowdstrile driver by booting into safe mode. You still need a valid administrator account so authentication is also not compromised.
You would still need some kind of exploit to bypass the windows login screen.
No, that’s not what it means.
If the device is wired to the LAN, the admin logon authenticates the user with the domain server, and thus decrypts the files using the credentials that are stored server-side.
If the drive would be fully encrypted, you’d have to enter a password each time you boot the machine. That can be done, but is really not all that practical, especially not when working with a domain server / remote admin.
For a private computer, you can have a look at Veracrypt (FOSS) if you want to have a fully encrypted drive.
