SV-253260r1210283: Windows 11 systems must use a BitLocker PIN for pre-boot authentication. | Microsoft Windows 11 STIG SCAP Benchmark

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Assessment Title

Rule Text

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

Description

Discussion Text

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.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-002476

References

DPMS Target Microsoft Windows 11 DISA DPMS Target Microsoft Windows 11 5471

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.windows11:def:253260
# Windows 11 systems must use a BitLocker PIN for pre-boot authentication.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# 'Require additional authentication at startup' is Enabled.
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE').GetValueKind('UseAdvancedStartup').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'UseAdvancedStartup' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'UseAdvancedStartup') -eq 1))
}
# registry_object (registry_test)
function test_2 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE').GetValueKind('OSManageNKP').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'OSManageNKP' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'OSManageNKP') -eq 1))
}
# 'Configure TPM startup PIN' is set to 'Require startup PIN with TPM'.
# registry_object (registry_test)
function test_3 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE').GetValueKind('UseTPMPIN').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'UseTPMPIN' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'UseTPMPIN') -eq 1))
}
# 'Configure TPM startup key and PIN' is set to 'Require startup key and PIN with TPM'.
# registry_object (registry_test)
function test_4 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE').GetValueKind('UseTPMKeyPIN').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'UseTPMKeyPIN' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'UseTPMKeyPIN') -eq 1))
}
# registry_object (registry_test)
function test_5 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE').GetValueKind('OSManageNKP').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'OSManageNKP' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'OSManageNKP') -eq 1))
}
# 'Configure TPM startup PIN' is set to 'Allow startup PIN with TPM'.
# registry_object (registry_test)
function test_6 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE').GetValueKind('UseTPMPIN').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'UseTPMPIN' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'UseTPMPIN') -eq 2))
}
# 'Configure TPM startup key and PIN' is set to 'Allow startup key and PIN with TPM'.
# registry_object (registry_test)
function test_7 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE').GetValueKind('UseTPMKeyPIN').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'UseTPMKeyPIN' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'UseTPMKeyPIN') -eq 2))
}

if ((test_1 -and ((test_2 -and (test_3 -or test_4)) -or (test_5 -and (test_6 -or test_7))))) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_windows_11 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows11:def:253260
$compliant = (Get-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\FVE' -ErrorAction SilentlyContinue).UseAdvancedStartup -eq 1 -and ((Get-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\FVE' -ErrorAction SilentlyContinue).OSManageNKP -eq $null -or (Get-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\FVE' -ErrorAction SilentlyContinue).UseTPMPIN -eq 1 -or (Get-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\FVE' -ErrorAction SilentlyContinue).UseTPMKeyPIN -eq 1)
if ($compliant) {Write-Output "PASS"; exit 0} else {Write-Output "FAIL"; exit 1}

Remediation

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".