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FFOX-00-000033 Firefox must be configured so that DNS over HTTPS is disabled.

DISA STIG library V6R9
All changes in this version
first version loaded CAT II

Maps to CM-7 via CCI-000381

Title

Firefox must be configured so that DNS over HTTPS is disabled.

Control

Type "about:policies" in the browser address bar. If "DNSOverHTTPS" is not displayed under Policy Name or the Policy Value does not have "Enabled" with a value of "false", this is a finding.

Discussion

DNS over HTTPS has generally not been adopted in the DoW. DNS is tightly controlled. 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 and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Applications are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of nonessential capabilities include, but are not limited to, advertising software or browser plug-ins not related to requirements or providing a wide array of functionality not required for every mission, but cannot be disabled.

Related controls

CCI-000381

Fix

Windows group policy: 1. Open the group policy editor tool with "gpedit.msc". 2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox\DNS Over HTTPS Policy Name: Enabled Policy State: Disabled macOS "plist" file: DNSOverHTTPS Enabled Linux "policies.json" file: Add the following in the policies section: "DNSOverHTTPS": {"Enabled": false}