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AUSCERT External Security Bulletin Redistribution
ESB-2020.4488
BIG-IP AFM vulnerability CVE-2020-27714
18 December 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP AFM
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27714
Original Bulletin:
https://support.f5.com/csp/article/K60344652
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K60344652: BIG-IP AFM vulnerability CVE-2020-27714
Original Publication Date: 17 Dec, 2020
Security Advisory Description
On the BIG-IP AFM, when a Protocol Inspection Profile is attached to a FastL4
virtual server with the protocol field configured to either Other or All
Protocols, the TMM may experience a restart if the profile processes non-TCP
traffic. (CVE-2020-27714)
Impact
The affected BIG-IP system may temporarily fail to process traffic as it
recovers from a Traffic Management Microkernel (TMM) restart. If the BIG-IP
system is configured for high availability (HA), it fails over to a peer
system.
Security Advisory Status
F5 Product Development has assigned ID 754855 (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 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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |None |16.0.0 | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |15.1.1 | | | |
| | |15.1.0 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |14.1.3.1 | | | |
| | |14.1.3 | | | | |
|BIG-IP AFM +------+----------+----------+High |7.5 |TMM |
| |13.x |13.1.0 - |None | | | |
| | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |None |Not | | | |
|Analytics, APM, | | |applicable|Not | | |
|ASM, DNS, FPS, GTM,+------+----------+----------+vulnerable|None |None |
|Link Controller, |13.x |None |Not | | | |
|PEM) | | |applicable| | | |
| +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|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
Depending on the deployment environment, you can configure the virtual protocol
field on the affected FastL4 virtual server to TCP or UDP, and it will
mitigate this vulnerability.
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 K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
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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