K93417064 : MFC vulnerability CVE-2019-6681

Security Advisory Description

Memory leak in Multicast Forwarding Cache (MFC) handling in tmrouted. (CVE-2019-6681)

Impact

A BIG-IP system licensed with the ZebOS dynamic routing and multicast routing bundle, configured with (static or dynamic) multicast routes that use the Multicast Forwarding Cache (MFC), may experience a memory leak in the tmrouted process, exhaust system resources, restart, and cause a disruption of service. MFC is used for forwarding packets matching multicast routes and is used by static and dynamic multicast routing protocols.

Note: ZebOS dynamic routing and multicast routing bundle licenses are required.

Vulnerable configurations consist of static multicast routes or dynamic multicast routing protocols configured, such as Protocol Independent Multicasting (PIM).

For more information about PIM multicast routing configurations, refer to the BIG-IP Advanced Routing Multicast Configuration Guide.

For information about multicast static route creation, refer to the ip mroute command section in theBIG-IP Advanced Routing Network Services Manager Command Line Interface Reference Guide.

Note: For information about how to locate F5 product manuals, refer to K98133564: Tips for searching AskF5 and finding product documentation.