Firefox Development Tools Must Be Disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-97529	DTBF195	SV-106633r2_rule		Low

Description
While the risk associated with browser development tools is more related to the proper design of a web application, a risk vector remains within the browser. The developer tools allow end users and application developers to view and edit all types of web application related data via the browser. Page elements, source code, javascript, API calls, application data, etc. may all be viewed and potentially manipulated. Manipulation could be useful for troubleshooting legitimate issues, and this may be performed in a development environment. Manipulation could also be malicious and must be addressed.

Description

While the risk associated with browser development tools is more related to the proper design of a web application, a risk vector remains within the browser. The developer tools allow end users and application developers to view and edit all types of web application related data via the browser. Page elements, source code, javascript, API calls, application data, etc. may all be viewed and potentially manipulated. Manipulation could be useful for troubleshooting legitimate issues, and this may be performed in a development environment. Manipulation could also be malicious and must be addressed.

STIG	Date
Mozilla FireFox Security Technical Implementation Guide	2020-06-19

Details

Check Text ( C-96365r1_chk )
Procedure: Open a browser window, type "about:config" in the address bar. Criteria: If the value of "devtools.policy.disabled" is not "true", then this is a finding.

Fix Text (F-103207r1_fix)
Set the value of "devtools.policy.disabled" to "true" using the Mozilla.cfg file, or the registry value of HKLM\Software\Policies\Mozilla\Firefox\DisableDeveloperTools to “1”