Firefox is configured to allow JavaScript to hide or change the status bar.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-15987	DTBF184	SV-16929r1_rule		Medium

Description
When a user visits some webpages, JavaScript can hide or make changes to the browser’s appearance to hide unauthorized activity. This activity can help disguise an attack taking place in a minimized background window. Determines whether the text in the browser status bar may be set by JavaScript. Set and lock to True (default in Firefox) so that JavaScript access to preference settings for is disabled.

Description

When a user visits some webpages, JavaScript can hide or make changes to the browser’s appearance to hide unauthorized activity. This activity can help disguise an attack taking place in a minimized background window. Determines whether the text in the browser status bar may be set by JavaScript. Set and lock to True (default in Firefox) so that JavaScript access to preference settings for is disabled.

STIG	Date
Mozilla Firefox Security Technical Implementation Guide	2017-12-21

Details

Check Text ( C-16627r1_chk )
Type "about:config" in the address bar of the browser. Verify that the preference “dom.disable_window_status_change" is set and locked to “true”. Criteria: If the parameter is set incorrectly, then this is a finding. If the setting is not locked, then this is a finding.

Fix Text (F-15999r1_fix)
Ensure the preference "dom.disable_window_status_change" is set and locked to the value of “true”.