SV-220940r991589: The system must be configured to meet the minimum session security requirement for NTLM SSP based clients. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

The system must be configured to meet the minimum session security requirement for NTLM SSP based clients.

Description

Discussion Text

Microsoft has implemented a variety of security support providers for use with RPC sessions. All of the options must be enabled to ensure the maximum security level.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366V-63805SV-78295

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:220940
# The system must be configured to meet the minimum session security requirement for NTLM SSP based clients.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# The system is configured to meet the minimum session security requirement for NTLM SSP based clients.
# 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\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0').GetValueKind('NTLMMinClientSec').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0' -Name 'NTLMMinClientSec' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'NTLMMinClientSec') -eq 537395200))
}

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:220940
$registryPath = "HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0"
$regKey = "NTLMMinClientSec"
$regValue = 537395200
if (Test-Path $registryPath -PathType Container) {
    $regData = Get-ItemProperty -Path $registryPath -Name $regKey -ErrorAction SilentlyContinue
    if ($regData -and $regData.$regKey -eq $regValue) {
        Write-Output "PASS"; exit 0
    }
}
Write-Output "FAIL"; exit 1

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Minimum session security for NTLM SSP based (including secure RPC) clients" to "Require NTLMv2 session security" and "Require 128-bit encryption" (all options selected).