SV-25057r2: The amount of idle time required before suspending a session must be properly set. | Windows 7 Security Technical Implementation Guide

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Assessment Title

Rule Text

The amount of idle time required before suspending a session must be properly set.

Description

Discussion Text

Open sessions can increase the avenues of attack on a system. This setting is used to control when a computer disconnects an inactive SMB session. If client activity resumes, the session is automatically re-established. This protects critical and sensitive network data from exposure to unauthorized personnel with physical access to the computer.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001133Not mappedCCI-002361CCE-9406-0

Additional Details

Third-Party Tools

Responsibility

System Administrator

References

DPMS Target Windows 7 DISA DPMS Target Windows 7 1712

Checks

OVAL

oval:mil.disa.fso.windows:var:369900 ← xccdf_mil.disa.stig_value_amount_of_idle_time_required_before_suspending_session_var

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:3699
# The amount of idle time required before suspending a session must be properly set.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Microsoft network server: Amount of idle time required before suspending session' is set to '15' minutes or less
# 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\System\CurrentControlSet\Services\LanmanServer\Parameters').GetValueKind('AutoDisconnect').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters' -Name 'AutoDisconnect' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AutoDisconnect') -le 15))
}

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 windows_7 target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:3699
$idleTimeLimit = (Get-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\LanmanServer\Parameters" -Name "AutoDisconnect").AutoDisconnect
if ($idleTimeLimit -eq $null -or $idleTimeLimit -gt 15) { Write-Output "FAIL"; exit 1 } else { Write-Output "PASS"; exit 0 }

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft Network Server: Amount of idle time required before suspending session" to "15" minutes or less.