Title

Firefox must be configured to not automatically update installed add-ons and plugins. (Cat II impact)

Discussion

Set this to false to disable checking for updated versions of the Extensions/Themes. Automatic updates from untrusted sites puts the enclave at risk of attack and may override security settings.

Check Content

Type "about:policies" in the browser window. If "ExtensionUpdate" is not displayed under Policy Name or the Policy Value is not "false", 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\Extensions Policy Name: Extension Update Policy State: Disabled macOS "plist" file: Add the following: <key>ExtensionUpdate</key> <false/> Linux "policies.json" file: Add the following in the policies section: "ExtensionUpdate": false

Additional Identifiers

Rule ID: SV-251549r879587_rule

Vulnerability ID: V-251549

Group Title: SRG-APP-000141

Expert Comments

CCIs tied to check.

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