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FFOX-00-000027 Firefox deprecated ciphers must be disabled.

DISA STIG library V6R9
All changes in this version
first version loaded CAT II

Maps to CM-7 via CCI-000381

Title

Firefox deprecated ciphers must be disabled.

Control

Type "about:policies" in the browser address bar. If "DisabledCiphers" is not displayed under Policy Name or the Policy Value is not "TLS_RSA_WITH_3DES_EDE_CBC_SHA" with a value of "true", this is a finding.

Discussion

A weak cipher is defined as an encryption/decryption algorithm that uses a key of insufficient length. Using an insufficient length for a key in an encryption/decryption algorithm opens up the possibility (or probability) that the encryption scheme could be broken.

Related controls

CCI-000381

Fix

Windows group policy: 1. Open the group policy editor tool with "gpedit.msc". 2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox\Disabled Ciphers Policy Name: TLS_RSA_WITH_3DES_EDE_CBC_SHA Policy State: Enabled macOS "plist" file: Add the following: DisabledCiphers TLS_RSA_WITH_3DES_EDE_CBC_SHA Linux "policies.json" file: Add the following in the policies section: "DisabledCiphers": { "TLS_RSA_WITH_3DES_EDE_CBC_SHA": true }