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             AUSCERT External Security Bulletin Redistribution

    K28042514: BIG-IP TMM and DNS profile vulnerability CVE-2022-23017
                              21 January 2022


        AusCERT Security Bulletin Summary

Product:           BIG-IP TMM
                   BIG-IP DNS profile
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-23017  

Original Bulletin: 

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K28042514: BIG-IP TMM and DNS profile vulnerability CVE-2022-23017

Original Publication Date: 19 Jan, 2022

Security Advisory Description

When a virtual server is configured with a DNS profile with the Rapid Response
Mode setting enabled and is configured on a BIG-IP system, undisclosed requests
can cause the Traffic Management Microkernel (TMM) to terminate. (


System performance can degrade until the process is either forced to restart or
is manually restarted. This vulnerability allows a remote unauthenticated
attacker to cause a degradation of service that can lead to a denial-of-service
(DoS) on the BIG-IP system.

Security Advisory Status

F5 Product Development has assigned ID 999933 (BIG-IP) to this vulnerability.
This issue has been classified as CWE-476: NULL Pointer Dereference.

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.

Note: After a fix is introduced for a given minor branch, that fix applies to
all subsequent maintenance and point releases for that branch, and no
additional fixes for that branch will be listed in the table. For example, when
a fix is introduced in, the fix also applies to, and all
later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to
K51812227: Understanding security advisory versioning. Additionally, software
versions preceding those listed in the Applies to (see versions) box of this
article have reached the End of Technical Support (EoTS) phase of their
lifecycle and are no longer evaluated for security issues. For more
information, refer to the Security hotfixes section of K4602: Overview of the
F5 security vulnerability response policy.

|           |      |Versions   |Fixes     |          |CVSSv3|Vulnerable       |
|Product    |Branch|known to be|introduced|Severity  |score^|component or     |
|           |      |vulnerable^|in        |          |2     |feature          |
|           |      |1          |          |          |      |                 |
|           |16.x  |16.0.0 -   |16.1.0    |          |      |                 |
|           |      |16.0.1     |          |          |      |                 |
|           +------+-----------+----------+          |      |                 |
|           |15.x  |15.1.0 -   |  |          |      |                 |
|           |      |15.1.4     |          |          |      |                 |
|           +------+-----------+----------+          |      |                 |
|           |14.x  |14.1.0 -   |  |          |      |TMM/DNS profile  |
|BIG-IP (all|      |14.1.4     |          |          |      |with Rapid       |
|modules)   +------+-----------+----------+High      |7.5   |Response mode    |
|           |13.x  |13.1.0 -   |None      |          |      |enabled          |
|           |      |13.1.4     |          |          |      |                 |
|           +------+-----------+----------+          |      |                 |
|           |12.x  |None       |Not       |          |      |                 |
|           |      |           |applicable|          |      |                 |
|           +------+-----------+----------+          |      |                 |
|           |11.x  |None       |Not       |          |      |                 |
|           |      |           |applicable|          |      |                 |
|           |8.x   |None       |Not       |          |      |                 |
|BIG-IQ     |      |           |applicable|Not       |      |                 |
|Centralized+------+-----------+----------+vulnerable|None  |None             |
|Management |7.x   |None       |Not       |          |      |                 |
|           |      |           |applicable|          |      |                 |
|F5OS-A     |1.x   |None       |Not       |Not       |None  |None             |
|           |      |           |applicable|vulnerable|      |                 |
|F5OS-C     |1.x   |None       |Not       |Not       |None  |None             |
|           |      |           |applicable|vulnerable|      |                 |
|Traffix SDC|5.x   |None       |Not       |Not       |None  |None             |
|           |      |           |applicable|vulnerable|      |                 |

^1F5 only evaluates software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle.

^2The 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 installing a version listed in
the Fixes introduced in column. If the Fixes introduced in column does not list
a version for your branch, then no update candidate currently exists for that
branch and F5 recommends upgrading to a version with the fix (refer to the

If the Fixes introduced in column lists a version prior to the one you are
running, in the same branch, then your version should have the fix.


To mitigate this vulnerability, you can disable the Rapid Response Mode setting
in the DNS profile associated with the affected virtual server. To do so,
perform the following procedure:

Impact of action: Performing the following procedure should not have a negative
impact on your system.

 1. Log in to the Configuration utility of the affected BIG-IP system.
 2. Go to either of the following locations:
       Local Traffic > Profiles > Services > DNS
       DNS > Delivery > Profiles > DNS
 3. Select the DNS profile associated with the affected virtual server.
 4. Under Denial of Service Protection, for the Rapid Response Mode setting,
    select Disabled.
 5. Select Update.


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 K8986: F5 software lifecycle 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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