Firefox Development Tools Must Be Disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-97529	DTBF195	SV-106633r1_rule		Low

Description
Information needed by an attacker to begin looking for possible vulnerabilities in a web browser includes any information about the web browser and plug-ins or modules being used. When debugging or trace information is enabled in a production web browser, information about the web browser, such as web browser type, version, patches installed, plug-ins and modules installed, type of code being used by the hosted application, and any back-ends being used for data storage may be displayed. Since this information may be placed in logs and general messages during normal operation of the web browser, an attacker does not need to cause an error condition to gain this information.

Description

Information needed by an attacker to begin looking for possible vulnerabilities in a web browser includes any information about the web browser and plug-ins or modules being used. When debugging or trace information is enabled in a production web browser, information about the web browser, such as web browser type, version, patches installed, plug-ins and modules installed, type of code being used by the hosted application, and any back-ends being used for data storage may be displayed. Since this information may be placed in logs and general messages during normal operation of the web browser, an attacker does not need to cause an error condition to gain this information.

STIG	Date
Mozilla FireFox Security Technical Implementation Guide	2019-12-12

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”