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Windows 10 systems must use a BitLocker PIN for pre-boot authentication.


Overview

Finding ID Version Rule ID IA Controls Severity
V-94859 WN10-00-000031 SV-104689r1_rule Medium
Description
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 non-volatile 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.
STIG Date
Windows 10 Security Technical Implementation Guide 2020-06-15

Details

Check Text ( C-94055r2_chk )
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)


BitLocker network unlock may be used in conjunction with a BitLocker PIN. See 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
Fix Text (F-100983r2_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".