18.9.11.1.4 (BL) Ensure 'Choose how BitLocker-protected fixed drives can be recovered: Recovery Password' is set to 'Enabled: Allow 48-digit recovery password'

Information

This policy setting allows you to control how BitLocker-protected fixed data drives are recovered in the absence of the required credentials. This policy setting is applied when you turn on BitLocker.
In 'Configure user storage of BitLocker recovery information' select whether users are allowed, required, or not allowed to generate a 48-digit recovery password or a 256-bit recovery key.
The recommended state for this setting is: Enabled: Allow 48-digit recovery password.

Rationale:
Administrators should always have a safe, secure way to access encrypted data in the event users cannot access their data.
Additionally, as with any authentication method, a drive can be compromised by guessing or finding the authentication information used to access the drive.
To use BitLocker, a Data Recovery Agent will need to be configured for fixed drives. To recover a drive will require highly-controlled access to the Data Recovery Agent private key.

Solution

To establish the recommended configuration via GP, set the following UI path to Enabled: Allow 48-digit recovery password:
Computer Configuration\Policies\Administrative Templates\Windows Components\BitLocker Drive Encryption\Fixed Data Drives\Choose how BitLocker-protected fixed drives can be recovered: Recovery Password
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 7 & Server 2008 R2 Administrative Templates (or newer).

Impact:
A 48-digit recovery password will be permitted for fixed drives.

Default Value:
Recovery options are specified by the user.

References:
1. CCE-33072-0

See Also

https://workbench.cisecurity.org/files/2754

Item Details

Category: ACCESS CONTROL, CONTINGENCY PLANNING

References: 800-53|AC-19(5), 800-53|CP-9, CSCv6|10.3, CSCv6|13.2, CSCv7|10.4, CSCv7|13.6

Plugin: Windows

Control ID: ced2b9751028378e8b963c1687641663fb780dbb400dd99c4c37a10c1a7e6ed4