Details

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.

Solution

Windows group policy:
1. Open the group policy editor tool with ‘gpedit.msc’.
2. Navigate to Policy Path: Computer ConfigurationAdministrative TemplatesMozillaFirefox
Policy Name: Minimum SSL version enabled
Policy State: Enabled
Policy Value: TLS 1.2

macOS ‘plist’ file:
Add the following:
SSLVersionMin
tls1.2

Linux ‘policies.json’ file:
Add the following in the policies section:
‘SSLVersionMin’: tls1.2

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MOZ_Firefox_V6R1_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Access Control.This control applies to the following type of system Unix.

References

• 800-53|AC-17(2)
• CAT|I
• CCI|CCI-001453
• Rule-ID|SV-251546r807110_rule
• STIG-ID|FFOX-00-000002
• Vuln-ID|V-251546

Source

• Tenable.com/audits