TMA-CHROME-2.25

Ensure 'Allow file or directory picker APIs to be called without prior user gesture' Is Disabled

MediumLevel 1Automatedchrome

Description

This setting controls the ability for showOpenFilePicker(), showSaveFilePicker(), and showDirectoryPicker() web APIs to be called without user interaction. If the value for FileOrDirectoryPickerWithoutGestureAllowedForOrigins is not changed from the default, it will behave as if it is disabled. Rationale: Setting this policy would allow the URLs selected to call the showOpenFilePicker(), showSaveFilePicker(), and showDirectoryPicker() web APIs without any user gesture/interaction. This policy does not need to be set for this reason. The policy is Disabled when it is not present: the audit prints 'absent' when the list key HKLM\SOFTWARE\Policies\Google\Chrome\FileOrDirectoryPickerWithoutGestureAllowedForOrigins is missing or empty, otherwise the configured entries.

How it is checked

Audit method: Windows registry

registry

$l = @((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\FileOrDirectoryPickerWithoutGestureAllowedForOrigins' -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\Allow file or directory picker APIs to be called without prior user gesture = Disabled. Locally, remove the policy entries at HKLM\SOFTWARE\Policies\Google\Chrome\FileOrDirectoryPickerWithoutGestureAllowedForOrigins after reviewing them.

Properties

Operating systems: Any
Tags: chromebrowsercis-l1
Reference: CIS Google Chrome Benchmark v3.0.0 - 2.25 Ensure 'Allow file or directory picker APIs to be called without prior user gesture' Is Disabled

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target chrome