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AUSCERT External Security Bulletin Redistribution
ESB-2021.0510
BIG-IP ASM WebSocket vulnerability CVE-2021-22976
11 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP (Advanced WAF, ASM)
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22976
Original Bulletin:
https://support.f5.com/csp/article/K88230177
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K88230177: BIG-IP ASM WebSocket vulnerability CVE-2021-22976
Original Publication Date: 11 Feb, 2021
Security Advisory Description
When the BIG-IP ASM system processes WebSocket requests with JSON payloads, an
unusually large number of parameters can cause excessive CPU usage in the
BIG-IP ASM bd process. (CVE-2021-22976)
Impact
When this vulnerability is exploited, the BIG-IP ASM system may take longer
than usual to process these WebSocket requests. As a result, the BIG-IP ASM
system may experience latency when passing requests to the backend server. Only
BIG-IP ASM systems configured with the JSON content profile with parameter
parsing (enabled by default) are affected.
Security Advisory Status
F5 Product Development has assigned ID 921337 (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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |16.0.0 - |16.0.1.1 | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |15.1.2 | | | |
| | |15.1.1 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |14.1.3.1 | | | |
|BIG-IP (Advanced | |14.1.3 | | | | |
|WAF, ASM) +------+----------+----------+High |7.5 |bd process|
| |13.x |13.1.0 - |13.1.3.6 | | | |
| | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, |14.x |None |Not | | | |
|APM, DDHD, DNS, | | |applicable|Not | | |
|FPS, GTM, Link +------+----------+----------+vulnerable|None |None |
|Controller, PEM, |13.x |None |Not | | | |
|SSLO) | | |applicable| | | |
| +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |6.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
None
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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