SV-225319r569185: All Direct Access traffic must be routed through the internal network. | Microsoft Windows Server 2012/2012 R2 Member Server STIG SCAP Benchmark

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Assessment Title

Rule Text

All Direct Access traffic must be routed through the internal network.

Description

Discussion Text

Routing all Direct Access traffic through the internal network allows monitoring and prevents split tunneling.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366CCE-25221-3SV-53183V-21961

References

DPMS Target Microsoft Windows Server 2012-2012 R2 MS DISA DPMS Target Microsoft Windows Server 2012-2012 R2 MS 4214

Checks

OVAL

oval:mil.disa.fso.windows:var:443600 ← xccdf_mil.disa.stig_value_route_all_traffic_through_the_internal_network_var

DISA STIG (Manual Reference)

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \Software\Policies\Microsoft\Windows\TCPIP\v6Transition\

Value Name: Force_Tunneling

Type: REG_SZ
Value: Enabled

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.fso.windows:def:4436
# All Direct Access traffic must be routed through the internal network.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Route all traffic through the internal network' is set to 'Enabled: Enabled State'
# 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\Windows\TCPIP\v6Transition').GetValueKind('Force_Tunneling').ToString()]) -eq 'reg_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\TCPIP\v6Transition' -Name 'Force_Tunneling' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'Force_Tunneling') -eq 'Enabled'))
}

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_2012_and_2012_r2_ms target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:4436
$regPath = "HKLM:\Software\Policies\Microsoft\Windows\TCPIP\v6Transition"
$regKey = "Force_Tunneling"
$regValue = "Enabled"
$regValuePath = "$regPath\$regKey"
if (Test-Path $regValuePath) {
    $regData = Get-ItemProperty -Path $regValuePath -ErrorAction SilentlyContinue
    if ($regData -and $regData.Force_Tunneling -eq $regValue) {
        Write-Output "PASS"
        exit 0
    }
}
Write-Output "FAIL"
exit 1

Remediation

Configure the policy value for Computer Configuration -> Administrative Templates -> Network -> Network Connections -> "Route all traffic through the internal network" to "Enabled: Enabled State".