TMA-CHROME-1.12
Ensure 'Disable Certificate Transparency enforcement for a list of URLs' is set to 'Disabled'
Description
Google Chrome can specify URLs/hostnames for which Certificate Transparency will not be enforced. If this setting is disabled, no URLs are excluded from Certificate Transparency requirements. The recommended state for this setting is: Disabled (0) Rationale: Certificates that are required to be disclosed via Certificate Transparency shall be treated for all URLs as untrusted if they are not disclosed according to the Certificate Transparency policy. The policy is Disabled when it is not present: the audit prints 'absent' when the list key HKLM\SOFTWARE\Policies\Google\Chrome\CertificateTransparencyEnforcementDisabledForUrls is missing or empty, otherwise the configured entries.
How it is checked
Audit method: Windows registry
$l = @((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\CertificateTransparencyEnforcementDisabledForUrls' -ErrorAction SilentlyContinue).PSObject.Properties | Where-Object { $_.Name -notlike 'PS*' } | ForEach-Object { "$($_.Value)" }); if ($l.Count -eq 0) { 'absent' } else { 'configured: ' + ($l -join ', ') }- Expected output
absent
How it is fixed
Fix method: Guidance or infrastructure patch
Configure through Group Policy: Computer Configuration\Policies\Administrative Templates\Google\Google Chrome\Disable Certificate Transparency enforcement for a list of URLs = Disabled. Locally, remove the policy entries at HKLM\SOFTWARE\Policies\Google\Chrome\CertificateTransparencyEnforcementDisabledForUrls after reviewing them.
Properties
- Operating systems
- Any
- Tags
- chromebrowsercis-l1
- Reference
- CIS Google Chrome Benchmark v3.0.0 - 1.12 Ensure 'Disable Certificate Transparency enforcement for a list of URLs' is set to 'Disabled'
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target chrome