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18.9.11.1.2 Ensure 'Choose how BitLocker-protected fixed drives can be recovered' is set to 'Enabled'

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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.

The 'Allow data recovery agent' check box is used to specify whether a Data Recovery Agent can be used with BitLocker-protected fixed data drives.

Before a Data Recovery Agent can be used it must be added from the Public Key Policies item in either the Group Policy Management Console or the Local Group Policy Editor.

Consult the BitLocker Drive Encryption Deployment Guide on Microsoft TechNet for more information about adding Data Recovery Agents.

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.

Select 'Omit recovery options from the BitLocker setup wizard' to prevent users from specifying recovery options when they enable BitLocker on a drive.

This means that you will not be able to specify which recovery option to use when you enable BitLocker, instead BitLocker recovery options for the drive are determined by the policy setting.

In 'Save BitLocker recovery information to Active Directory Domain Services' choose which BitLocker recovery information to store in AD DS for fixed data drives.

If you select 'Backup recovery password and key package', both the BitLocker recovery password and key package are stored in AD DS.

Storing the key package supports recovering data from a drive that has been physically corrupted.

If you select 'Backup recovery password only', only the recovery password is stored in AD DS.

Select the 'Do not enable BitLocker until recovery information is stored in AD DS for fixed data drives' check box if you want to prevent users from enabling BitLocker unless the computer is connected to the domain and the backup of BitLocker recovery information to AD DS succeeds.

Note: If the 'Do not enable BitLocker until recovery information is stored in AD DS for fixed data drives' check box is selected, a recovery password is automatically generated.

The recommended state for this setting is: 'Enabled'.

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.

Solution

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


Computer Configuration\Policies\Administrative Templates\Windows Components\BitLocker Drive Encryption\Fixed Data Drives\Choose how BitLocker-protected fixed drives can be recovered


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:
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.

See Also

https://workbench.cisecurity.org/files/1929

Item Details

Category: CONTINGENCY PLANNING, SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|CP-10(6), 800-53|SC-28(1), CSCv6|10.3, CSCv6|13.2

Plugin: Windows

Control ID: ac47fa52fc7c5531fc2fc1973ed82a64c404d21d246cb59d81b985fcb584064f