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11 February 2021

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             AUSCERT External Security Bulletin Redistribution

                BIG-IP FPS XSS vulnerability CVE-2021-22979
                             11 February 2021


        AusCERT Security Bulletin Summary

Product:           BIG-IP Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-22979  

Original Bulletin: 

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K63497634: BIG-IP FPS XSS vulnerability CVE-2021-22979

Original Publication Date: 11 Feb, 2021

Security Advisory Description

A reflected cross-site scripting (XSS) vulnerability exists in an undisclosed
page of the BIG-IP Configuration utility when Fraud Protection Service is
provisioned, which allows an attacker to execute JavaScript in the context of
the current logged-in user. (CVE-2021-22979)


A remote attacker may potentially exploit this vulnerability by sending a
specific crafted URL that includes the specific target host name and malicious
HTML or JavaScript code to a BIG-IP Configuration utility user, which is then
reflected back to the victim and executed by the web browser. If the exploit is
successful, an attacker can run JavaScript in the context of the currently
logged-in user. In the case of an administrative user with access to the
Advanced Shell (bash), successful exploitation of this vulnerability can be
leveraged to completely compromise the BIG-IP system through remote code

Security Advisory Status

F5 Product Development has assigned ID 933741 (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 or |
|                |      |be        |in        |          |1     |feature      |
|                |      |vulnerable|          |          |      |             |
|                |16.x  |16.0.0    |16.0.1    |          |      |             |
|                +------+----------+----------+          |      |             |
|                |15.x  |15.0.0 -  |15.1.1    |          |      |             |
|                |      |15.1.0    |          |          |      |             |
|BIG-IP (LTM,    +------+----------+----------+          |      |             |
|AAM, Advanced   |14.x  |14.1.0 -  |  |          |      |             |
|WAF, AFM,       |      |14.1.2    |          |          |      |BIG-IP FPS   |
|Analytics, APM, +------+----------+----------+High      |7.5   |Configuration|
|ASM, DDHD, DNS, |13.x  |13.1.0 -  |  |          |      |utility      |
|FPS, GTM, Link  |      |13.1.3    |          |          |      |             |
|Controller, PEM,+------+----------+----------+          |      |             |
|SSLO)           |12.x  |12.1.0 -  |None      |          |      |             |
|                |      |12.1.5    |          |          |      |             |
|                +------+----------+----------+          |      |             |
|                |11.x  |None      |Not       |          |      |             |
|                |      |          |applicable|          |      |             |
|                |7.x   |None      |Not       |          |      |             |
|BIG-IQ          |      |          |applicable|Not       |      |             |
|Centralized     +------+----------+----------+vulnerable|None  |None         |
|Management      |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.


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.

To mitigate this vulnerability for affected F5 products, you should permit
management access to F5 products only over a secure network and limit shell
access to only trusted users. For more information about securing access to
BIG-IP and Enterprise Manager systems, refer to K13309: Restricting access to
the Configuration utility by source IP address (11.x - 16.x) and K13092:
Overview of securing access to the BIG-IP system.

You should avoid browsing unsecured sites while managing BIG-IP through the
Configuration utility as the XSS attack may be delivered through these
unsecured sites.

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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