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V-251551

CAT II (Medium)

Firefox must be configured to disable form fill assistance.

Rule ID

SV-251551r960963_rule

STIG

Mozilla Firefox Security Technical Implementation Guide

Version

V6R7

CCIs

CCI-000381

Discussion

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 information from prefilled information.

Check Content

Type "about:policies" in the browser window. 

If "DisableFormHistory" is not displayed under Policy Name or the Policy Value is not "true", this is a finding.

Fix Text

Windows group policy:
1. Open the group policy editor tool with "gpedit.msc".
2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox
Policy Name: Disable Form History
Policy State: Enabled

macOS "plist" file:
Add the following:
<key>DisableFormHistory</key>
<true/>

Linux "policies.json" file:
Add the following in the policies section:
"DisableFormHistory": true