SV-14859r2: Users must be prevented from connecting using Terminal Services. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

Users must be prevented from connecting using Terminal Services.

Description

Discussion Text

Allowing a Terminal Services session to a workstation enables another avenue of access that could be exploited. The system must be configured to prevent users from connecting to a computer using Terminal Services.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002314

References

DPMS Target Windows Vista DISA DPMS Target Windows Vista 1029

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:511
# Users must be prevented from connecting using Terminal Services.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# registry_object (registry_test)
function test_1 {
  return (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fDenyTSConnections' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'fDenyTSConnections') -eq 1)
}
# registry_object (registry_test)
function test_2 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fDenyTSConnections')))
}
# registry_object (registry_test)
function test_3 {
  return ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fDenyTSConnections'))
}
# 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\Policies\Microsoft\Windows NT\Terminal Services').GetValueKind('fDenyTSConnections').ToString()]) -eq 'reg_dword')
}
# registry_object (registry_test)
function test_5 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'fDenyTSConnections')))
}

if (((test_1 -or test_2) -and test_3 -and (test_4 -or test_5))) {
  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 windows_vista target this check assesses.

# oval:mil.disa.fso.windows:def:511
if (!(Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services" -ErrorAction SilentlyContinue).fDenyTSConnections -or (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services" -ErrorAction SilentlyContinue).fDenyTSConnections -eq 1) {exit 1} else {exit 0}

Remediation

Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Terminal Services -> Terminal Server -> Connections "Allow users to connect remotely using Terminal Services" to "Disabled.