SV-226401r961083: Guest Mode must be disabled. | Google Chrome Current Windows STIG SCAP Benchmark

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Assessment Title

Rule Text

Guest Mode must be disabled.

Description

Discussion Text

If this policy is set to true or not configured, Google Chrome will enable guest logins. Guest logins are Google Chrome profiles where all windows are in incognito mode. If this policy is set to false, Google Chrome will not allow guest profiles to be started.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001166SV-111829V-102867

References

DPMS Target Google Chrome Current Windows DISA DPMS Target Google Chrome Current Windows 4081

Checks

DISA STIG (Manual Reference)

Universal method: 
1. In the omnibox (address bar) type chrome://policy 
2. If BrowserGuestModeEnabled is not displayed under the Policy Name column or it is not set to 0 under the Policy Value column, this is a finding.

Windows method:
1. Start regedit
2. Navigate to HKLM\Software\Policies\Google\Chrome\
3. If the BrowserGuestModeEnabled value name does not exist or its value data is not set to 0, this is a finding.

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.chrome:def:240069
# Guest Mode 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 check that BrowserGuestModeEnabled is set to 0 to disable Browser Guest Mode
# 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\Google\Chrome').GetValueKind('BrowserGuestModeEnabled').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'BrowserGuestModeEnabled' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'BrowserGuestModeEnabled') -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 google_chrome target this check assesses.

# OVAL Definition: oval:mil.disa.stig.chrome:def:240069
$regPath = "HKLM:\Software\Policies\Google\Chrome"
$regKey = "BrowserGuestModeEnabled"
$regValue = 0

if (-not (Test-Path $regPath)) { exit 0 }
$regValueProp = Get-ItemProperty -Path $regPath -Name $regKey -ErrorAction SilentlyContinue
if ($regValueProp -and $regValueProp.$regKey -eq $regValue) { exit 0 }
exit 1

Remediation

Windows group policy:
1. Open the "group policy editor" tool with gpedit.msc 
2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Google\Google Chrome\
Policy Name: Enable guest mode in browser
Policy State: Disabled