SV-251546r1201983: Firefox must be configured to allow only TLS 1.2 or above. | Mozilla Firefox for Windows STIG SCAP Benchmark

Loading benchmark…

Assessment Title

Rule Text

Firefox must be configured to allow only TLS 1.2 or above.

Description

Discussion Text

Use of versions prior to TLS 1.2 are not permitted. SSL 2.0 and SSL 3.0 contain a number of security flaws. These versions must be disabled in compliance with the Network Infrastructure and Secure Remote Computing STIGs.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001453

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:101
# Firefox must be configured to allow only TLS 1.2 or above.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Firefox is configured to allow only TLS 1.2 or above
# 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('SSLVersionMin').ToString()]) -eq 'reg_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'SSLVersionMin') -match 'tls1\.[23]'))
}

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:101
$compliant = (Test-Path -Path "HKLM:\SOFTWARE\Policies\Mozilla\Firefox" -ErrorAction SilentlyContinue) -and ((Get-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Mozilla\Firefox" -Name SSLVersionMin -ErrorAction SilentlyContinue).SSLVersionMin -match "tls1\.(2|3)"); if($compliant){Write-Output "PASS"; exit 0} else {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: Minimum SSL version enabled
Policy State: Enabled
Policy Value: TLS 1.2   (or TLS 1.3)

macOS "plist" file:
Add the following:
<key>SSLVersionMin</key>
<string>tls1.2</string>   (or <string>tls1.3</string>)

Linux "policies.json" file:
Add the following in the policies section:
"SSLVersionMin": "tls1.2"   or ("SSLVersionMin": "tls1.3")