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V-252881

CAT II (Medium)

Firefox must be configured to not delete data upon shutdown.

Rule ID

SV-252881r960963_rule

STIG

Mozilla Firefox Security Technical Implementation Guide

Version

V6R7

CCIs

CCI-000381

Discussion

For diagnostic purposes, data must remain behind when the browser is closed. This is required to meet non-repudiation controls.

Check Content

Type "about:policies" in the browser address bar. 

If "SanitizeOnShutdown" is not displayed under Policy Name or the Policy Value does not have {"Cache":false,"Cookies":false,"Downloads":false,"FormData":false,"Sessions":false,"History":false,"OfflineApps":false,"SiteSettings":false,"Locked":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\Clear data when browser is closed
Policy Name: Cache, Cookies, Download History, Form & Search History, Browsing History, Active Logins, Site Preferences, Offline Website Data
Policy State: Disabled
Policy Name: Locked
Policy State: Enabled

macOS "plist" file:
Add the following:
<key>SanitizeOnShutdown</key>
<dict>
  <key>Cache</key>
  <false/>
  <key>Cookies</key>
  <false/>
  <key>Downloads</key>
  <false/>
  <key>FormData</key>
  <false/>
  <key>History</key>
  <false/>
  <key>Sessions</key>
  <false/>
  <key>SiteSettings</key>
  <false/>
  <key>OfflineApps</key>
  <false/>
  <key>Locked</key>
  <true/>
</dict>

Linux "policies.json" file:
Add the following in the policies section:
"SanitizeOnShutdown": {
  "Cache": false,
  "Cookies": false,
  "Downloads": false,
  "FormData": false,
  "History": false,
  "Sessions": false,
  "SiteSettings": false,
  "OfflineApps": false,
  "Locked": true 
}