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             AUSCERT External Security Bulletin Redistribution

           K30573026: BIG-IP virtual server with FastL4 profile
                       vulnerability CVE-2022-23027
                               23 April 2022


        AusCERT Security Bulletin Summary

Product:           BIG-IP Virtual server with FastL4
Publisher:         F5 Networks
Operating System:  Network Appliance
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-23027  

Original Bulletin: 

Comment: CVSS (Max):  5.3 CVE-2022-23027 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
         CVSS Source: F5
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Revision History:  April   23 2022: Vendor added fixed version for BIG-IP
                   January 21 2022: Initial Release

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K30573026: BIG-IP virtual server with FastL4 profile vulnerability

Original Publication Date: 19 Jan, 2022
Latest   Publication Date: 19 Apr, 2022

Security Advisory Description

When a FastL4 profile and an HTTP, FIX, and/or hash persistence profile are
configured on the same virtual server, undisclosed requests can cause the
virtual server to stop processing new client connections. (CVE-2022-23027)


Traffic is disrupted for new client connections. This vulnerability allows an
unauthenticated remote attacker to cause a denial-of-service (DoS) on the
BIG-IP system, specific to the impacted virtual server. There is no control
plane exposure; this is a data plane issue only.

Security Advisory Status

F5 Product Development has assigned ID 887965 (BIG-IP) to this
vulnerability. This issue has been classified as CWE-697: Incorrect Comparison

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        |          |1     |feature          |
|           |16.x  |None       |16.0.0    |          |      |                 |
|           +------+-----------+----------+          |      |                 |
|           |15.x  |15.1.0 -   |15.1.4    |          |      |                 |
|           |      |15.1.3     |          |          |      |                 |
|           +------+-----------+----------+          |      |                 |
|           |14.x  |14.1.0 -   |  |          |      |                 |
|           |      |14.1.4     |          |          |      |Virtual server   |
|BIG-IP (all+------+-----------+----------+Medium    |5.3   |with FastL4 and  |
|modules)   |13.x  | - |13.1.5    |          |      |certain L7       |
|           |      |13.1.4     |          |          |      |profiles         |
|           +------+-----------+----------+          |      |                 |
|           |12.x  | - |Will not  |          |      |                 |
|           |      |12.1.6     |fix       |          |      |                 |
|           +------+-----------+----------+          |      |                 |
|           |11.x  |   |Will not  |          |      |                 |
|           |      |           |fix       |          |      |                 |
|           |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 evaluates only 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 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.




This issue was discovered internally by F5.

Supplemental Information

o K16446: The BIG-IP system now allows a Performance (Layer 4) virtual server
    to have an associated HTTP profile
  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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