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AUSCERT External Security Bulletin Redistribution
ESB-2020.2926
BIG-IP ASM Configuration utility vulnerability CVE-2020-5928
26 August 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP ASM Configuration utility
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Cross-site Request Forgery -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-5928
Original Bulletin:
https://support.f5.com/csp/article/K40843345
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K40843345:BIG-IP ASM Configuration utility vulnerability CVE-2020-5928
Security Advisory
Original Publication Date: 26 Aug, 2020
Security Advisory Description
An attacker may use the BIG-IP ASM Configuration utility cross-site request
forgery (CSRF) protection token multiple times. (CVE-2020-5928)
Impact
When the token is stolen, an attacker may be able to send POST requests to the
affected BIG-IP ASM system to modify the configuration.
Security Advisory Status
F5 Product Development has assigned ID 888493 (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| | | | |
+----------------+------+----------+----------+----------+------+-------------+
| |16.x |None |16.0.0 | | | |
| +------+----------+----------+ | | |
| | |15.1.0 |15.1.0.5 | | | |
| |15.x |15.0.0 - |15.0.1.4 | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |14.1.2.7 | | | |
|BIG-IP (ASM) | |14.1.2 | | | |BIG-IP ASM |
| +------+----------+----------+Low |2.9 |Configuration|
| |13.x |13.1.0 - |None | | |utility |
| | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |12.1.5.2 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |None | | | |
| | |11.6.5 | | | | |
+----------------+------+----------+----------+----------+------+-------------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, +------+----------+----------+ | | |
|AAM, AFM, |14.x |None |Not | | | |
|Analytics, APM, | | |applicable|Not | | |
|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
To mitigate this vulnerability for the BIG-IP ASM system, you should only
permit management access to the BIG-IP ASM system over a secure network and
limit shell access to only trusted users. For more information about securing
access to BIG-IP systems, refer to K13309: Restricting access to the
Configuration utility by source IP address (11.x - 16.x) and K13092: Overview
of securing access to the BIG-IP system.
Acknowledgements
F5 would like to acknowledge Piyush Pandey for bringing this issue to our
attention and for following the highest standards of coordinated disclosure.
Supplemental Information
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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