CVE-2020-5942

K82530456: BIG-IP Diameter vulnerability CVE-2020-5942

Original Publication Date: Nov 03, 2020

Security Advisory Description

When processing Capabilities-Exchange-Answer (CEA) packets with certain attributes from the Policy and Charging Rules Function (PCRF) server, the Traffic Management Microkernel (TMM) may generate a core file and restart.(CVE-2020-5942)

Impact

This vulnerability affects only virtual servers configured with the Diameter Endpoint profile with Gx capability to connect to a PCRF. When attackers exploit the vulnerability, TMM creates a core file and restarts. As a result, the BIG-IP system fails to process traffic and fails over to its high availability (HA) peer, if configured.

Security Advisory Status

F5 Product Development has assigned ID 879745 (BIG-IP) to this vulnerability.

To determine if your product and version have been evaluated for this vulnerability, refer to the (Applies to (see versions) box. To determine if your release is known to be vulnerable, the components or features that are affected by the vulnerability, and for information about releases, point releases, or hotfixes that address the vulnerability, refer to F5’s security advisory below. For more information about security advisory versioning, refer to K51812227: Understanding Security Advisory versioning.

Affected and fixed versions: F5 maintains the authoritative version matrix for this advisory, and it changes over time. For the current list of affected and fixed versions, see F5’s security advisory K82530456.

Security Advisory 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 the Fixes introduced in 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.

Mitigation

To mitigate this vulnerability, you can associate an iRule to the affected BIG-IP APM virtual server. For more information about the iRule, contact F5 Support referencing this article number.