SV-220849r1137695: Local drives must be prevented from sharing with Remote Desktop Session Hosts. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

Local drives must be prevented from sharing with Remote Desktop Session Hosts.

Description

Discussion Text

Preventing users from sharing the local drives on their client computers to Remote Session Hosts that they access 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-001090SV-78221V-63731

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:220849
# Local drives must be prevented from sharing with Remote Desktop Session Hosts.
# 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 drive 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('fDisableCdm').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fDisableCdm' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'fDisableCdm') -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_10 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows10:def:220849
$compliant = (Get-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services' -ErrorAction SilentlyContinue).fDisableCdm -eq 1
if ($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 drive redirection" to "Enabled".