Google Chrome
TMA-CHROME-2.20
Ensure 'Allow Web Authentication requests on sites with broken TLS certificates' Is Disabled
Description
This policy setting controls the WebAuthn API and its interaction with sites that have a broken TLS certificate. It can be configured to either: - Disabled (0): Do not allow WebAuthn API requests on sites with broken TLS certificates. - Enabled (1): Allow WebAuthn API requests on sites with broken TLS certificates. Rationale: Setting this policy will block the ability to authenticate to any website that does not have a valid TLS certificate since the identity of the site cannot be verified. Audit reads the Group Policy registry value and prints 'compliant', 'unset' (policy not configured, reported as FAIL) or the non-compliant value. Registry value: HKLM\SOFTWARE\Policies\Google\Chrome:AllowWebAuthnWithBrokenTlsCerts (REG_DWORD); compliant when it is 0. Remediation writes 0 locally; in a domain set it through the ADMX so Group Policy does not revert it.
How it is checked
Audit method: Windows registry
$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome' -Name 'AllowWebAuthnWithBrokenTlsCerts' -ErrorAction SilentlyContinue).'AllowWebAuthnWithBrokenTlsCerts'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @(0) -contains [int64]$v)) { 'compliant' } else { "non-compliant: $v" }- Expected output
compliant
How it is fixed
Fix method: Shell command
$p = 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome'; if (-not (Test-Path -Path $p)) { New-Item -Path $p -Force | Out-Null }; New-ItemProperty -Path $p -Name 'AllowWebAuthnWithBrokenTlsCerts' -Value 0 -PropertyType DWord -Force | Out-NullProperties
- Operating systems
- Any
- Tags
- chromebrowsercis-l1
- Reference
- CIS Google Chrome Benchmark v3.0.0 - 2.20 Ensure 'Allow Web Authentication requests on sites with broken TLS certificates' Is Disabled
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target chrome