SV-220803r958478: Internet connection sharing must be disabled. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

Internet connection sharing must be disabled.

Description

Discussion Text

Internet connection sharing makes it possible for an existing internet connection, such as through wireless, to be shared and used by other systems essentially creating a mobile hotspot. This exposes the system sharing the connection to others with potentially malicious purpose.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000381SV-86389V-71765

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:220803
# Internet connection sharing must be disabled.
# 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\Network Connections').GetValueKind('NC_ShowSharedAccessUI').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Network Connections' -Name 'NC_ShowSharedAccessUI' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'NC_ShowSharedAccessUI') -eq 0))
}

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:220803
$regPath = "HKLM:\SOFTWARE\Policies\Microsoft\Windows\Network Connections"
$regKey = "NC_ShowSharedAccessUI"
if (-not (Test-Path $regPath)) { exit 0 } # compliant if key doesn't exist
$regValue = Get-ItemProperty -Path $regPath -Name $regKey -ErrorAction SilentlyContinue
if ($regValue -eq $null -or $regValue.$regKey -ne 0) { exit 1 } # non-compliant if value is not 0
exit 0

Remediation

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Network Connections >> "Prohibit use of Internet Connection Sharing on your DNS domain network" to "Enabled".