Check: WN10-00-000031
Microsoft Windows 10 STIG:
WN10-00-000031
(in versions v2 r9 through v2 r4)
Title
Windows 10 systems must use a BitLocker PIN for pre-boot authentication. (Cat I impact)
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 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.
Check Content
If the following registry value does not exist or is not configured as specified, this is a finding. For virtual desktop implementations (VDIs) in which the virtual desktop instance is deleted or refreshed upon logoff, this is NA. For Azure Virtual Desktop (AVD) implementations with no data at rest, this is NA. 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 at the link below for information about network unlock. https://docs.microsoft.com/en-us/windows/security/information-protection/bitlocker/bitlocker-how-to-enable-network-unlock
Fix Text
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".
Additional Identifiers
Rule ID: SV-220703r953806_rule
Vulnerability ID: V-220703
Group Title: SRG-OS-000185-GPOS-00079
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-001199 |
The information system protects the confidentiality and/or integrity of organization-defined information at rest. |
| CCI-002445 |
The organization distributes symmetric cryptographic keys using NIST FIPS-compliant or NSA-approved key management technology and processes. |
| CCI-002446 |
The organization produces asymmetric cryptographic keys using: NSA-approved key management technology and processes; approved PKI Class 3 certificates or prepositioned keying material; or approved PKI Class 3 or Class 4 certificates and hardware security tokens that protect the user^s private key. |
| CCI-002475 |
The information system implements cryptographic mechanisms to prevent unauthorized modification of organization-defined information at rest on organization-defined information system components. |
| CCI-002476 |
The information system implements cryptographic mechanisms to prevent unauthorized disclosure of organization-defined information at rest on organization-defined information system components. |