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             AUSCERT External Security Bulletin Redistribution

              K32760744: libxml2 vulnerability CVE-2022-23308
                                26 May 2022


        AusCERT Security Bulletin Summary

Product:           BIG-IP (all modules)
                   BIG-IQ Centralized Management
                   Traffix SDC
Publisher:         F5 Networks
Operating System:  Network Appliance
Resolution:        Mitigation
CVE Names:         CVE-2022-23308  

Original Bulletin: 

Comment: CVSS (Max):  7.5 CVE-2022-23308 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: F5 Networks
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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K32760744: libxml2 vulnerability CVE-2022-23308

Original Publication Date: 26 May, 2022

Security Advisory Description

valid.c in libxml2 before 2.9.13 has a use-after-free of ID and IDREF
attributes. (CVE-2022-23308)


The security impact of xmlGetID() returning a pointer to freed memory depends
on the application and mostly results in denial-of-service (DoS). The typical
use case of calling xmlGetID() on an unmodified document is not affected.

Security Advisory Status

F5 Product Development has assigned ID 1091453 (BIG-IP), ID 1091453-8 (BIG-IQ),
ID 1091857 (F5OS-A), ID 1091853 (F5OS-C), and ID 2056913 (Traffix SDC) to this

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 known|Fixes     |        |CVSSv3|Vulnerable    |
|Product      |Branch|to be         |introduced|Severity|score^|component or  |
|             |      |vulnerable^1  |in        |        |2     |feature       |
|             |17.x  |17.0.0        |None      |        |      |              |
|             +------+--------------+----------+        |      |              |
|             |16.x  |16.1.0 -      |None      |        |      |              |
|             |      |16.1.2        |          |        |      |              |
|             +------+--------------+----------+        |      |              |
|             |15.x  |15.1.0 -      |None      |        |      |              |
|             |      |15.1.5        |          |        |      |              |
|BIG-IP (all  +------+--------------+----------+High    |7.5   |BaseOS, TMUI, |
|modules)     |14.x  |14.1.0 -      |None      |        |      |monitors      |
|             |      |14.1.4        |          |        |      |              |
|             +------+--------------+----------+        |      |              |
|             |13.x  |13.1.0 -      |None      |        |      |              |
|             |      |13.1.5        |          |        |      |              |
|             +------+--------------+----------+        |      |              |
|             |12.x  |12.1.0 -      |None      |        |      |              |
|             |      |12.1.6        |          |        |      |              |
|BIG-IQ       |8.x   |8.0.0 - 8.2.0 |None      |        |      |BaseOS, TMUI, |
|Centralized  +------+--------------+----------+High    |7.5   |monitors      |
|Management   |7.x   |7.0.0 - 7.1.0 |None      |        |      |              |
|F5OS-A       |1.x   |1.0.0 - 1.0.1 |None      |High    |7.5   |libxml2       |
|             |      |1.3.0 - 1.3.2 |          |        |      |              |
|F5OS-C       |1.x   |1.2.0 - 1.2.2 |None      |High    |7.5   |libxml2       |
|             |      |1.1.0 - 1.1.4 |          |        |      |              |
|Traffix SDC  |5.x   |5.2.0         |None      |Medium  |5.1   |libxml2       |
|             |      |5.1.0         |          |        |      |              |

^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 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, do not process any untrusted XML documents in
any form. The following list includes, but is not limited to, some examples of
XML processing on the BIG-IP system:

  o XML content-based routing

    For more information, refer to the Routing Based on XML Content chapter of
    the BIG-IP Local Traffic Manager: Implementations manual.

    Note: For information about how to locate F5 product manuals, refer to
    K98133564: Tips for searching AskF5 and finding product documentation.

  o BIG-IP ASM and Advanced WAF XML virtual servers processing XML data
  o Extended Application Verification (EAV) monitors parsing XML
  o iRules XML commands
  o iApps application programming language (APL)
  o QKview

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 - 17.x)
  o K15106: Managing BIG-IQ product hotfixes
  o K15113: BIG-IQ hotfix and point release matrix
  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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