SV-251551r960963: Firefox must be configured to disable form fill assistance. | Mozilla Firefox for Windows STIG SCAP Benchmark

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Assessment Title

Rule Text

Firefox must be configured to disable form fill assistance.

Description

Discussion Text

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.

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

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.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.firefox.windows:def:106
# Firefox must be configured to disable form fill assistance.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Software\Policies\Mozilla\Firefox\DisableFormHistory is set to 1 reg_dword
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox').GetValueKind('DisableFormHistory').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox' -Name 'DisableFormHistory' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableFormHistory') -eq 1))
}

if (test_1) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

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

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual moz_firefox_windows target this check assesses.

# OVAL Definition: oval:mil.disa.stig.firefox.windows:def:106
$registryPath = "HKLM:\SOFTWARE\Policies\Mozilla\Firefox"
$registryName = "DisableFormHistory"
$registryValue = 1
if (Test-Path $registryPath) {
    $registryItem = Get-ItemProperty -Path $registryPath -Name $registryName -ErrorAction SilentlyContinue
    if ($registryItem -and $registryItem.$registryName -eq $registryValue) {
        Write-Output "PASS"
        Exit 0
    }
}
Write-Output "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: 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