18.9.11.2.12 Ensure 'Configure use of passwords for operating system drives' is set to 'Disabled'

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Information

This policy setting specifies the constraints for passwords used to unlock BitLocker-protected operating system drives.

Note: This setting is enforced when turning on BitLocker, not when unlocking a volume. BitLocker will allow unlocking a drive with any of the protectors available on the drive.

The recommended state for this setting is: Disabled.

Rationale:

Using a dictionary-style attack, passwords can be guessed or discovered by repeatedly attempting to unlock a drive. Since this type of BitLocker password does include anti-dictionary attack protections provided by a TPM, for example, there is no mechanism to slow down rapid brute-force attacks against them.

Impact:

The password option will not be available when configuring BitLocker for the operating system drive.

Solution

To establish the recommended configuration via GP, set the following UI path to Disabled:

Computer Configuration\Policies\Administrative Templates\Windows Components\BitLocker Drive Encryption\Operating System Drives\Configure use of passwords for operating system drives

Note: This Group Policy path may not exist by default. It is provided by the Group Policy template VolumeEncryption.admx/adml that is included with the Microsoft Windows 8.0 & Server 2012 (non-R2) Administrative Templates (or newer).

Default Value:

Passwords are supported, without complexity requirements and with an 8 character minimum.

See Also

https://workbench.cisecurity.org/files/3714