SV-220806r991589: Simultaneous connections to the internet or a Windows domain must be limited. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

Simultaneous connections to the internet or a Windows domain must be limited.

Description

Discussion Text

Multiple network connections can provide additional attack vectors to a system and must be limited. The "Minimize the number of simultaneous connections to the Internet or a Windows Domain" setting prevents systems from automatically establishing multiple connections. When both wired and wireless connections are available, for example, the less-preferred connection (typically wireless) will be disconnected.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366SV-78071V-63581

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:220806
# Simultaneous connections to the internet or a Windows domain must be limited.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Simultaneous connections to the internet or a Windows domain are limited
# 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\WcmSvc\GroupPolicy').GetValueKind('fMinimizeConnections').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WcmSvc\GroupPolicy' -Name 'fMinimizeConnections' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'fMinimizeConnections') -eq 3))
}

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:220806
$registryPath = "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WcmSvc\GroupPolicy"
$regKey = "fMinimizeConnections"
$regValue = 3
if (Test-Path $registryPath) {
    $regData = Get-ItemProperty -Path $registryPath -Name $regKey -ErrorAction SilentlyContinue
    if ($regData -and $regData.$regKey -eq $regValue) {
        Write-Output "PASS"; exit 0
    }
}
Write-Output "FAIL"; exit 1

Remediation

The default behavior for "Minimize the number of simultaneous connections to the Internet or a Windows Domain" is "Enabled".

If this must be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Windows Connection Manager >> "Minimize the number of simultaneous connections to the Internet or a Windows Domain" to "Enabled". 

Under "Options", set "Minimize Policy Options" to "3 = Prevent Wi-Fi When on Ethernet".