SV-252881r960963: Firefox must be configured to not delete data upon shutdown. | Mozilla Firefox for Linux STIG SCAP Benchmark

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Assessment Title

Rule Text

Firefox must be configured to not delete data upon shutdown.

Description

Discussion Text

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

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000381

References

DPMS Target Mozilla Firefox 2021 VERSION DISA DPMS Target Mozilla Firefox 2021 VERSION 5446

Checks

DISA STIG (Manual Reference)

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.

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# oval:mil.disa.stig.firefox.linux:def:116 compliance check

if [ ! -f "$HOME/.mozilla/firefox/policies.json" ]; then echo "PASS"; exit 0; fi
grep -q '"SanitizeOnShutdown":\{' "$HOME/.mozilla/firefox/policies.json" || { echo "FAIL"; exit 1; }
grep -q '"Cache":\s*false' "$HOME/.mozilla/firefox/policies.json" && grep -q '"Cookies":\s*false' "$HOME/.mozilla/firefox/policies.json" && grep -q '"Downloads":\s*false' "$HOME/.mozilla/firefox/policies.json" && grep -q '"FormData":\s*false' "$HOME/.mozilla/firefox/policies.json" && { echo "PASS"; exit 0; }
echo "FAIL"; exit 1;

Remediation

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 
}