SV-16614r1: Terminal Services idle session time limit does not meet the requirement. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

Terminal Services idle session time limit does not meet the requirement.

Description

Discussion Text

This setting controls how long a session may be idle before it is automatically disconnected from the server. Users should disconnect if they plan on being away from their terminals for extended periods of time. Idle sessions should be disconnected after 15 minutes.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001133Not mappedCCI-002361CCE-4267-1

Additional Details

Third-Party Tools

Responsibility

System Administrator

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:475
# Terminal Services idle session time limit does not meet the requirement.
# 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 (((@{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('MaxIdleTime').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'MaxIdleTime' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'MaxIdleTime') -le 900000))
}
# registry_object (registry_test)
function test_2 {
  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('MaxIdleTime').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Terminal Services' -Name 'MaxIdleTime' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'MaxIdleTime') -ne 0))
}

if ((test_1 -and test_2)) {
  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 Definition: oval:mil.disa.fso.windows:def:475
$regPath = "HKLM:\Software\Policies\Microsoft\Windows NT\Terminal Services"
$maxIdleTime = (Get-ItemProperty -Path $regPath -Name MaxIdleTime -ErrorAction SilentlyContinue).MaxIdleTime
if ($maxIdleTime -le 900 && $maxIdleTime -ne 0) {exit 0} else {exit 1}

Remediation

Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Terminal Services -> Terminal Server -> Session Time Limits “Set time limit for active but idle Terminal Services sessions” to “Enabled”, and the “Idle session limit” set to 15 minutes or less, excluding 0 which equates to “Never”.