SOL02201365 - SLOTH: TLS 1.2 handshake vulnerability CVE-2015-7575

Vulnerability Recommended Actions

If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by upgrading to a version listed in theVersions known to be not vulnerable column. If the table lists only an older version than what you are currently running, or does not list a non-vulnerable version, then no upgrade candidate currently exists.

F5 responds to vulnerabilities in accordance with the Severity values published in the previous table. TheSeverity values and other security vulnerability parameters are defined in SOL4602: Overview of the F5 security vulnerability response policy.

Mitigating this vulnerability

Data plane

ECV monitors: Limit traffic between the BIG-IP system and pool members, to trusted traffic.

Control plane

Apache: Limit network access to the management interface, to a secure, management-only network.

Authentication services: Limit user authentication services to use only the BIG-IP control plane.

big3d: Limit connections to port 4353, to trusted hosts. For more information, refer to SOL13309: Restricting access to the Configuration utility by source IP address (11.x - 12.x).

CMI: Ensure that the IP address used for ConfigSync is on a trusted network. In addition, ensure that your ConfigSync self IP address is not configured with a Port Lockdown setting of**Allow All **(allow-service all).

Supplemental Information

• Transcript Collision Attacks: Breaking Authentication in TLS, IKE, and SSH

Note: The previous link takes you to a resource outside of AskF5. The third party could remove the document without our knowledge.

• SOL9970: Subscribing to email notifications regarding F5 products
• SOL9957: Creating a custom RSS feed to view new and updated documents
• SOL4918: Overview of the F5 critical issue hotfix policy