SV-251547r1260193: Firefox must be configured to ask which certificate to present to a website when a certificate is required. | Mozilla Firefox for Linux STIG SCAP Benchmark

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Assessment Title

Rule Text

Firefox must be configured to ask which certificate to present to a website when a certificate is required.

Description

Discussion Text

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 DoW require user authentication for access, which increases security for DoW information. Access will be denied to the user if certificate management is not configured.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000187

References

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

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:102

if [ ! -f "policies.json" ]; then echo "PASS"; exit 0; fi
grep -q '"security\\.default_personal_cert":\{[^}]*Value[^}]*\\"Ask Every Time\\"[^}]*Status[^}]*\\"locked\\"[^}]*' policies.json && echo "PASS" || 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\
Policy Name: Preferences
Policy State: Enabled
Policy Value:
{
  "security.default_personal_cert": {
    "Value": "Ask Every Time",
    "Status": "locked"
  }
}

macOS "plist" file:
Add the following:
<key>Preferences</key>
<dict>
  <key>security.default_personal_cert</key>
  <dict>
    <key>Value</key>
    <string>Ask Every Time</string>
    <key>Status</key>
    <string>locked</string>
  </dict>
</dict>

Linux "policies.json" file:
Add the following in the policies section:
"Preferences": {
  "security.default_personal_cert": {
    "Value": "Ask Every Time",
    "Status": "locked"
  }
}