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How to Bypass Bitlocker for Crowdstrike BSoD (fix)

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

Luci ,
@Luci@lemmy.ca avatar

So if this works it means bitlocker is useless.

Cute.

Kit OP ,

Howso? It still requires authentication, same as if the laptop booted normally.

Luci ,
@Luci@lemmy.ca avatar

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.

Kit OP ,

Are you under the impression that you have to enter a Bitlocker key during each boot?

OutsizedWalrus ,

That’s not what it means.

Bit locker is encryption at-rest. Logging in with an admin account means the system is no longer “at rest”. The admin is fully authorized to be operating that system.

viking ,
@viking@infosec.pub avatar

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.

SGG ,

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.

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