SV-225473r852251: The amount of idle time required before suspending a session must be properly set. | Microsoft Windows Server 2012/2012 R2 Member Server STIG SCAP Benchmark

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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 reestablished. 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-23897-2SV-52878V-1174

References

DPMS Target Microsoft Windows Server 2012-2012 R2 MS DISA DPMS Target Microsoft Windows Server 2012-2012 R2 MS 4214

Checks

OVAL

oval:mil.disa.fso.windows:var:456000 ← xccdf_mil.disa.stig_value_amount_of_idle_time_required_before_suspending_session_var

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:  \SYSTEM\CurrentControlSet\Services\LanManServer\Parameters\

Value Name:  autodisconnect

Value Type:  REG_DWORD
Value:  0x0000000f (15) (or less)

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:4560
# 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 ms_windows_2012_and_2012_r2_ms target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:4560
$idleTime = (Get-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Services\LanmanServer\Parameters\AutoDisconnect').AutoDisconnect -as [int]
if ($idleTime -le 15 -or $null -eq $idleTime) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

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.