Mozilla Firefox Security Technical Implementation Guide

Overview

Version	Date	Finding Count (37)			Downloads
6	2021-12-01 2011-05-21 2012-09-05 2012-09-05 2013-04-08 2013-07-03 2013-07-03 2014-01-08 2014-03-21 2014-07-03 2015-03-26 2015-06-30 2015-12-30 2015-12-30 2016-06-28 2016-06-28 2017-01-06 2017-03-22 2017-06-13 2017-12-21 2018-04-02 2018-09-17 2019-01-02 2019-03-20 2019-09-23 2019-12-12 2020-06-19 2020-06-19 2020-12-10 2020-12-10 2021-06-09 2022-09-09 2022-09-09 2022-09-09 2022-09-09 2023-06-05 2023-06-05 2023-06-05	CAT I (High): 2	CAT II (Med): 33	CAT III (Low): 2	Excel	JSON	XML

STIG Description
This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: disa.stig_spt@mail.mil.

Available Profiles

Classified	Public	Sensitive
I - Mission Critical Classified	I - Mission Critical Public	I - Mission Critical Sensitive	II - Mission Support Classified	II - Mission Support Public	II - Mission Support Sensitive	III - Administrative Classified	III - Administrative Public	III - Administrative Sensitive

Findings (MAC III - Administrative Sensitive)

Finding ID	Severity	Title	Description
V-251546	High	Firefox must be configured to allow only TLS 1.2 or above.	Use of versions prior to TLS 1.2 are not permitted. SSL 2.0 and SSL 3.0 contain a number of security flaws. These versions must be disabled in compliance with the Network Infrastructure and Secure...
V-251545	High	The installed version of Firefox must be supported.	Using versions of an application that are not supported by the vendor is not permitted. Vendors respond to security flaws with updates and patches. These updates are not available for unsupported...
V-251549	Medium	Firefox must be configured to not automatically update installed add-ons and plugins.	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.
V-251580	Medium	Firefox feedback reporting must be disabled.	Disable the menus for reporting sites (Submit Feedback, Report Deceptive Site). It is detrimental for applications to provide, or install by default, functionality exceeding requirements or...
V-251558	Medium	Background submission of information to Mozilla must be disabled.	Firefox by default sends information about Firefox to Mozilla servers. There should be no background submission of technical and other information from DoD computers to Mozilla with portions...
V-251555	Medium	Firefox must be configured to prevent JavaScript from raising or lowering windows.	JavaScript can raise and lower browser windows to cause improper input. Configure the browser setting to prevent scripts on visited websites from raising and lowering browser windows.
V-251554	Medium	Firefox must be configured to prevent JavaScript from moving or resizing windows.	JavaScript can make changes to the browser's appearance. This activity can help disguise an attack taking place in a minimized background window. Configure the browser setting to prevent scripts...
V-251557	Medium	Firefox must be configured to disable the installation of extensions.	A browser extension is a program that has been installed into the browser to add functionality. Where a plug-in interacts only with a web page and usually a third-party external application (e.g.,...
V-251556	Medium	Firefox must be configured to prevent JavaScript from disabling or replacing context menus.	A website may execute JavaScript that can remove or replace context menus/pop-up menus. This can help disguise an attack. Set this preference to "false" so that web pages will not be able to...
V-251551	Medium	Firefox must be configured to disable form fill assistance.	To protect privacy and sensitive data, Firefox provides the ability to configure the program so that data entered into forms is not saved. This mitigates the risk of a website gleaning private...
V-251550	Medium	Firefox must be configured to not automatically execute or download MIME types that are not authorized for auto-download.	Some files can be downloaded or execute without user interaction. This setting ensures these files are not downloaded and executed.
V-251553	Medium	Firefox must be configured to block pop-up windows.	Pop-up windows may be used to launch an attack within a new browser window with altered settings. This setting blocks pop-up windows created while the page is loading.
V-251578	Medium	Firefox accounts must be disabled.	Disable Firefox Accounts integration (Sync). It is detrimental for applications to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary...
V-251577	Medium	Firefox must be configured so that DNS over HTTPS is disabled.	DNS over HTTPS has generally not been adopted in the DoD. DNS is tightly controlled. It is detrimental for applications to provide, or install by default, functionality exceeding requirements or...
V-251576	Medium	The Firefox New Tab page must not show snippets.	The New Tab page by default shows messages from Mozilla. The new tab page must not show unnecessary messages from Mozilla. It is detrimental for applications to provide, or install by default,...
V-251575	Medium	The Firefox New Tab page must not show highlights.	The New Tab page by default shows the sites the user visits the most. The new tab page must not actively show user activity. It is detrimental for applications to provide, or install by default,...
V-251574	Medium	The Firefox New Tab page must not show recommended stories.	The New Tab page by default shows web pages recommended by a third party (Pocket). The new tab page must not show unrelated/unnecessary content to the user. It is detrimental for applications to...
V-251573	Medium	The Firefox New Tab page must not show top sites.	The New Tab page by default shows a list of built-in top sites, as well as the top sites the user has visited. It is detrimental for applications to provide, or install by default, functionality...
V-251572	Medium	Firefox must not recommend extensions as the user is using the browser.	The Recommended Extensions program recommends extensions to users as they surf the web. The user must not be encouraged to install extensions from the websites they visit. Allowed extensions are...
V-251571	Medium	Firefox deprecated ciphers must be disabled.	A weak cipher is defined as an encryption/decryption algorithm that uses a key of insufficient length. Using an insufficient length for a key in an encryption/decryption algorithm opens up the...
V-251570	Medium	Firefox extension recommendations must be disabled.	The Recommended Extensions program makes it easier for users to discover extensions that have been reviewed for security, functionality, and user experience. Allowed extensions are to be centrally managed.
V-251552	Medium	Firefox must be configured to not use a password store with or without a master password.	Firefox can be set to store passwords for sites visited by the user. These individual passwords are stored in a file and can be protected by a master password. Autofill of the password can then be...
V-251581	Medium	Firefox encrypted media extensions must be disabled.	Enable or disable Encrypted Media Extensions and optionally lock it. If "Enabled" is set to "false", Firefox does not download encrypted media extensions (such as Widevine) unless the user...
V-251547	Medium	Firefox must be configured to ask which certificate to present to a website when a certificate is required.	When a website asks for a certificate for user authentication, Firefox must be configured to have the user choose which certificate to present. Websites within DoD require user authentication for...
V-251579	Medium	Firefox updates must not run in the background.	It is detrimental for applications to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked...
V-251568	Medium	Firefox cryptomining protection must be enabled.	The Content Blocking/Tracking Protection feature stops Firefox from loading content from malicious sites. The content might be a script or an image, for example. If a site is on one of the tracker...
V-251569	Medium	Firefox Enhanced Tracking Protection must be enabled.	Tracking generally refers to content, cookies, or scripts that can collect browsing data across multiple sites. It is detrimental for applications to provide, or install by default, functionality...
V-251564	Medium	Firefox search suggestions must be disabled.	Search suggestions must be disabled as this could lead to searches being conducted that were never intended to be made.
V-251548	Medium	Firefox must be configured to not automatically check for updated versions of installed search plugins.	Updates must be controlled and installed from authorized and trusted servers. This setting overrides a number of other settings that may direct the application to access external URLs.
V-251567	Medium	Firefox fingerprinting protection must be enabled.	The Content Blocking/Tracking Protection feature stops Firefox from loading content from malicious sites. The content might be a script or an image, for example. If a site is on one of the tracker...
V-251560	Medium	Firefox must have the DoD root certificates installed.	The DoD root certificates will ensure that the trust chain is established for server certificates issued from the DoD Certificate Authority (CA).
V-251561	Medium	Firefox must be configured to not delete data upon shutdown.	For diagnostic purposes, data must remain behind when the browser is closed. This is required to meet non-repudiation controls.
V-251562	Medium	Firefox must prevent the user from quickly deleting data.	There should not be an option for a user to "forget" work they have done. This is required to meet non-repudiation controls.
V-251563	Medium	Firefox private browsing must be disabled.	Private browsing allows the user to browse the internet without recording their browsing history/activity. From a forensics perspective, this is unacceptable. Best practice requires that browser...
V-251566	Medium	Firefox network prediction must be disabled.	If network prediction is enabled, requests to URLs are made without user consent. The browser should always make a direct DNS request without prefetching occurring.
V-251559	Low	Firefox development tools must be disabled.	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...
V-251565	Low	Firefox autoplay must be disabled.	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.