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WN11-00-000031 Windows 11 systems must use a BitLocker PIN for pre-boot authentication.

DISA STIG library V2R11
All changes in this version
first version loaded CAT I

Maps to SC-28(1) via CCI-002476

Title

Windows 11 systems must use a BitLocker PIN for pre-boot authentication.

Control

For AVD implementations with no data at rest, this is NA. If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\FVE\ Value Name: UseAdvancedStartup Type: REG_DWORD Value: 0x00000001 (1) If one of the following registry values does not exist or is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\FVE\ Value Name: UseTPMPIN Type: REG_DWORD Value: 0x00000001 (1) Value Name: UseTPMKeyPIN Type: REG_DWORD Value: 0x00000001 (1) When BitLocker network unlock is used: Value Name: UseTPMPIN Type: REG_DWORD Value: 0x00000002 (2) Value Name: UseTPMKeyPIN Type: REG_DWORD Value: 0x00000002 (2) BitLocker network unlock may be used in conjunction with a BitLocker PIN. Refer to the article below regarding information about network unlock. https://docs.microsoft.com/en-us/windows/security/information-protection/bitlocker/bitlocker-how-to-enable-network-unlock

Discussion

If data at rest is unencrypted, it is vulnerable to disclosure. Even if the operating system enforces permissions on data access, an adversary can remove nonvolatile memory and read it directly, thereby circumventing operating system controls. Encrypting the data ensures that confidentiality is protected even when the operating system is not running. Pre-boot authentication prevents unauthorized users from accessing encrypted drives.

Related controls

CCI-002476

Fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> BitLocker Drive Encryption >> Operating System Drives "Require additional authentication at startup" to "Enabled" with "Configure TPM Startup PIN:" set to "Require startup PIN with TPM" or with "Configure TPM startup key and PIN:" set to "Require startup key and PIN with TPM". If Network Unlock is active, select "Configure TPM startup PIN:" and set to "Require startup PIN with TPM". If Network Unlock is not active, select "Configure TPM startup key and PIN:" and set to "Require startup key and PIN with TPM".