SV-220961r958726: The Change the system time user right must only be assigned to Administrators and Local Service and NT SERVICE\autotimesvc. | Microsoft Windows 10 STIG SCAP Benchmark

Loading benchmark…

Assessment Title

Rule Text

The Change the system time user right must only be assigned to Administrators and Local Service and NT SERVICE\autotimesvc.

Description

Discussion Text

Inappropriate granting of user rights can provide system, administrative, and other high level capabilities. Accounts with the "Change the system time" user right can change the system time, which can impact authentication, as well as affect time stamps on event log entries. The NT SERVICE\autotimesvc is added in v1909 cumulative update.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002235V-63855SV-78345

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:220961
# The Change the system time user right must only be assigned to Administrators and Local Service and NT SERVICE\autotimesvc.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Change the system time - Administrators, Local Service
# accesstoken_object (accesstoken_test)
function test_1 {
  return (($__tmp = "$env:TEMP\scc_userrights_$([guid]::NewGuid().Guid).cfg"; secedit /export /cfg $__tmp /areas USER_RIGHTS /quiet | Out-Null; $__m = Select-String -Path $__tmp -Pattern '^SeSystemtimePrivilege\s*=\s*(.+)$'; Remove-Item $__tmp -ErrorAction SilentlyContinue; if ($__m -and $__m.Matches[0].Groups[1].Value.Trim().Length -gt 0) { '1' } else { '0' }) -eq '0')
}
# System is running Windows 10 v1903 or prior
# registry_object (registry_test)
function test_2 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion').GetValueKind('ReleaseId').ToString()]) -eq 'reg_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion' -Name 'ReleaseId' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'ReleaseId') -le '1903'))
}
# Change the system time - Administrators, LOCAL SERVICE, NT SERVICE\autotimesvc
# accesstoken_object (accesstoken_test)
function test_3 {
  return (($__tmp = "$env:TEMP\scc_userrights_$([guid]::NewGuid().Guid).cfg"; secedit /export /cfg $__tmp /areas USER_RIGHTS /quiet | Out-Null; $__m = Select-String -Path $__tmp -Pattern '^SeSystemtimePrivilege\s*=\s*(.+)$'; Remove-Item $__tmp -ErrorAction SilentlyContinue; if ($__m -and $__m.Matches[0].Groups[1].Value.Trim().Length -gt 0) { '1' } else { '0' }) -eq '0')
}
# System is running Windows 10 v1909 or newer
# 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\Microsoft\Windows NT\CurrentVersion').GetValueKind('ReleaseId').ToString()]) -eq 'reg_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion' -Name 'ReleaseId' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'ReleaseId') -ge '1909'))
}

if (((test_1 -and test_2) -or (test_3 -and test_4))) {
  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:220961
$windowsVersion = (Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion').ReleaseId
$isWindows1909OrNewer = [version]$windowsVersion -ge [version]'1909'
$isWindows1903OrPrior = [version]$windowsVersion -le [version]'1903'
$seSystemTimePrivilege = (Get-CimInstance -ClassName Win32_UserAccount -Filter "Name='Administrators' OR Name='LOCAL SERVICE' OR Name='NT SERVICE\\autotimesvc'").LocalService
if (($isWindows1903OrPrior -and $seSystemTimePrivilege) -or ($isWindows1909OrNewer -and $seSystemTimePrivilege)) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Change the system time" to only include the following groups or accounts:

Administrators
LOCAL SERVICE
NT SERVICE\autotimesvc is added in v1909 cumulative update.