Title

Firefox autoplay must be disabled. (Cat III impact)

Discussion

Autoplay allows the user to control whether videos can play automatically (without user consent) with audio content. The user must be able to select content that is run within the browser window.

Check Content

Type "about:policies" in the browser address bar. If "Permissions" is not displayed under Policy Name or the Policy Value is not "Autoplay" with a value of "Default" and "Block-audio-video", this is a finding.

Fix Text

Windows group policy: 1. Open the group policy editor tool with "gpedit.msc". 2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox\Permissions\Autoplay Policy Name: Default autoplay level Policy State: Enabled Policy Value: Block Audio and Video macOS "plist" file: Add the following: <key>Permissions</key> <dict> <key>Autoplay</key> <dict> <string>block-audio-video</string> </dict> </dict> Linux "policies.json" file: Add the following in the policies section: "Permissions": { "Autoplay": { "Default": "block-audio-video" } }

Additional Identifiers

Rule ID: SV-251565r879587_rule

Vulnerability ID: V-251565

Group Title: SRG-APP-000141

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.