SV-221578r960864: Incognito mode must be disabled. | Google Chrome Current Windows STIG SCAP Benchmark

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Assessment Title

Rule Text

Incognito mode must be disabled.

Description

Discussion Text

Incognito mode allows the user to browse the Internet without recording their browsing history/activity. From a forensics perspective, this is unacceptable. Best practice requires that browser history is retained. The "IncognitoModeAvailability" setting controls whether the user may utilize Incognito mode in Google Chrome. If 'Enabled' is selected or the policy is left unset, pages may be opened in Incognito mode. If 'Disabled' is selected, pages may not be opened in Incognito mode. If 'Forced' is selected, pages may be opened ONLY in Incognito mode. 0 = Incognito mode available. 1 = Incognito mode disabled. 2 = Incognito mode forced.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000166SV-57611V-44777

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 IncognitoModeAvailability is not displayed under the Policy Name column or it is not set to 1 under the Policy Value column, then this is a finding.

Windows method:
   1. Start regedit
   2. Navigate to HKLM\Software\Policies\Google\Chrome\
   3. If the IncognitoModeAvailability value name does not exist or its value data is not set to 1, then 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:240030
# Incognito 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
# 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('IncognitoModeAvailability').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'IncognitoModeAvailability' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'IncognitoModeAvailability') -eq '1'))
}

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:240030
if (!(Test-Path -Path "HKLM:\Software\Policies\Google\Chrome\IncognitoModeAvailability" -ErrorAction SilentlyContinue) -or (Get-ItemProperty -Path "HKLM:\Software\Policies\Google\Chrome\IncognitoModeAvailability" -ErrorAction SilentlyContinue).IncognitoModeAvailability -ne 1) { Write-Output "FAIL"; Exit 1 } else { Write-Output "PASS"; Exit 0 }

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: Incognito mode availability
    Policy State: Enabled
    Policy Value: Incognito mode disabled