SV-226224r852119: Users must be prevented from mapping local COM ports and redirecting data from the Remote Desktop Session Host to local COM ports. (Remote Desktop Services Role). | Microsoft Windows Server 2012/2012 R2 Domain Controller STIG SCAP Benchmark

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Assessment Title

Rule Text

Users must be prevented from mapping local COM ports and redirecting data from the Remote Desktop Session Host to local COM ports. (Remote Desktop Services Role).

Description

Discussion Text

Preventing the redirection of Remote Desktop session data to a client computer's COM ports helps reduce possible exposure of sensitive data.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002314CCE-24625-6SV-52224V-15997

References

DPMS Target Microsoft Windows Server 2012-2012 R2 DC DISA DPMS Target Microsoft Windows Server 2012-2012 R2 DC 4217

Checks

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 NT\Terminal Services\

Value Name: fDisableCcm

Type: REG_DWORD
Value: 1

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:4628
# Users must be prevented from mapping local COM ports and redirecting data from the Remote Desktop Session Host to local COM ports.  (Remote Desktop Services Role).
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Do not allow COM port redirection' is set to '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\Windows NT\Terminal Services').GetValueKind('fDisableCcm').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fDisableCcm' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'fDisableCcm') -eq 1))
}

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_dc target this check assesses.

# oval:mil.disa.fso.windows:def:4628
$compliant = Test-Path -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services\fDisableCcm" -and (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services\fDisableCcm").fDisableCcm -eq 1
if ($compliant) { Write-Output "PASS"; exit 0 } else { Write-Output "FAIL"; exit 1 }

Remediation

Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Device and Resource Redirection -> "Do not allow COM port redirection" to "Enabled".