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AUSCERT External Security Bulletin Redistribution
ESB-2020.1078
BIG-IP TMM Ram Cache vulnerability CVE-2020-5861
27 March 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-5861
Original Bulletin:
https://support.f5.com/csp/article/K22113131
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K22113131 :BIG-IP TMM Ram Cache vulnerability CVE-2020-5861
Security Advisory
Original Publication Date: 27 Mar, 2020
Security Advisory Description
The TMM process may produce a core file in some cases when Ram Cache
incorrectly optimizes stored data resulting in memory errors. RAM Cache is a
BIG-IP feature used to accelerate HTTP traffic and can be enabled in a Web
Acceleration profile. (CVE-2020-5861)
Impact
The BIG-IP system temporarily fails to process traffic as it recovers from a
Traffic Management Microkernel (TMM) restart, and devices configured in a
device group may fail over.
Security Advisory Status
F5 Product Development has assigned ID 811109 (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 or|
| | |be |in | |1 |feature |
| | |vulnerable| | | | |
+-----------------+------+----------+----------+----------+------+------------+
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (LTM, AAM,| | |applicable| | | |
|AFM, Analytics, +------+----------+----------+ | |Web |
|APM, ASM, DNS, |13.x |None |Not |Low |3.7 |Acceleration|
|FPS, GTM, Link | | |applicable| | |profile Ram |
|Controller, PEM) +------+----------+----------+ | |Cache |
| |12.x |12.1.0 - |12.1.5.1 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |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
To mitigate this vulnerability, you can remove the Web Acceleration profile
from the affected virtual servers. To do so, perform the following procedure:
Impact of action: The Web Acceleration profile provides settings to configure
HTTP caching for the BIG-IP system. Removing the profile removes HTTP caching
on the system.
1. Log in to the Configuration utility
2. Go to Local Traffic > Virtual Servers.
3. Select the virtual server.
4. For Web Acceleration Profile, select None.
5. Select Update.
6. Repeat steps 3 through 5 for any other virtual servers that Web
Acceleration profile should be disabled.
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 - 15.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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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
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Internet Email: auscert@auscert.org.au
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