SV-220704r958552: Windows 10 systems must use a BitLocker PIN with a minimum length of six digits for pre-boot authentication. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows 10 systems must use a BitLocker PIN with a minimum length of six digits 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 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. Increasing the PIN length requires a greater number of guesses for an attacker.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001199Not mappedCCI-002475Not mappedCCI-002476SV-104691V-94861

References

DPMS Target Microsoft Windows 10 DISA DPMS Target Microsoft Windows 10 4072

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.windows10:def:220704
# Windows 10 systems must use a BitLocker PIN with a minimum length of six digits 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.

# BitLocker must be 6 digits or more.
# 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('MinimumPIN').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\FVE' -Name 'MinimumPIN' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'MinimumPIN') -ge 6))
}

if (test_1) {
  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_10 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows10:def:220704
if (Test-Path -Path "HKLM:\SOFTWARE\Policies\Microsoft\FVE" -ErrorAction SilentlyContinue) { $minPinLength = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\FVE" -Name MinimumPIN -ErrorAction SilentlyContinue).MinimumPIN; if ($minPinLength -ge 6) { Write-Output "PASS"; exit 0 } } Write-Output "FAIL"; exit 1

Remediation

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> BitLocker Drive Encryption >> Operating System Drives "Configure minimum PIN length for startup" to "Enabled" with "Minimum characters:" set to "6" or greater.