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AUSCERT External Security Bulletin Redistribution
ESB-2019.4764.3
MFC vulnerability CVE-2019-6681
11 February 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6681
Reference: ESB-2019.4764
Original Bulletin:
https://support.f5.com/csp/article/K93417064
Revision History: February 11 2020: Update Security Advisory Status table
January 31 2020: Added further vulnerability and impact
information, ZebOS dynamic routing and
multicast routing bundle licenses are
required
December 23 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K93417064:MFC vulnerability CVE-2019-6681
Security Advisory
Original Publication Date: 21 Dec, 2019
Latest Publication Date: 10 Feb, 2020
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 the BIG-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.
Security Advisory Status
F5 Product Development has assigned ID 781377 (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 the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding Security Advisory versioning.
+-------------------+------+----------+----------+----------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity |score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |15.1.0 | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
| | |14.1.0 - | | | | |
| |14.x |14.1.2 |14.1.2.1 | | | |
| | |14.0.0 - |14.0.1.1 | | | |
|BIG-IP (LTM) | |14.0.1 | | | | |
| +------+----------+----------+High |7.5 |tmrouted |
| |13.x |13.1.0 - |13.1.3.2 | | | |
| | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |12.1.5.1 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IP (AAM, AFM, |14.x |None |Not | | | |
|Analytics, APM, | | |applicable| | | |
|ASM, DNS, Edge +------+----------+----------+ | | |
|Gateway, FPS, GTM, |13.x |None |Not |Not |None |None |
|Link Controller, | | |applicable|vulnerable| | |
|PEM, +------+----------+----------+ | | |
|WebAccelerator) |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
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
None
Supplemental Information
o K51812227: Understanding Security Advisory versioning
o K41942608: Overview of Security Advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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