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AUSCERT External Security Bulletin Redistribution
ESB-2021.1459
TMM with HTTP/2 vulnerability (CVE-2021-23009)
29 April 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23009
Original Bulletin:
https://support.f5.com/csp/article/K90603426
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K90603426: TMM with HTTP/2 vulnerability (CVE-2021-23009)
Original Publication Date: 29 Apr, 2021
Security Advisory Description
Malformed HTTP/2 requests may cause an infinite loop which causes a Denial of
Service for Data Plane traffic. TMM takes the configured HA action when the TMM
process is aborted. There is no control plane exposure, this is a data plane
issue only.(CVE-2021-23009)
Impact
When this vulnerability is exploited, the system may experience a
denial-of-service (DoS) attack, which can cause the TMM process to restart.
Security Advisory Status
F5 Product Development has assigned ID 943081 (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 |15.1.0 - |15.1.3 | | | |
| | |15.1.2 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | |Virtual |
|Advanced WAF, AFM, |14.x |None |Not | | |servers |
|Analytics, APM, | | |applicable| | |configured|
|ASM, DDHD, DNS, +------+----------+----------+High |7.5 |to use the|
|FPS, GTM, Link |13.x |None |Not | | |HTTP/2 |
|Controller, PEM, | | |applicable| | |profile |
|SSLO) +------+----------+----------+ | | |
| |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| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5OS |1.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.
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
Acknowledgements
This issue was discovered internally by F5.
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 K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
systems (11.4.x and later)
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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