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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3777
                  BIG-IP TMUI Vulnerability CVE-2020-5940
                              3 November 2020

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           BIG-IP Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Administrator Compromise        -- Existing Account
                   Execute Arbitrary Code/Commands -- Existing Account
                   Cross-site Scripting            -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-5940  

Original Bulletin: 
   https://support.f5.com/csp/article/K43310520

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K43310520:BIG-IP TMUI Vulnerability CVE-2020-5940

Security Advisory

Original Publication Date: 03 Nov, 2020

Security Advisory Description

A stored cross-site scripting (XSS) vulnerability exists in an undisclosed page
of the BIG-IP Traffic Management User Interface (TMUI), also known as the
BIG-IP Configuration utility. (CVE-2020-5940)

Impact

An authenticated attacker may be able to store JavaScript, which is executed
when another authenticated user accesses the Configuration utility. If the
victim is an administrator user with Advanced Shell (bash) access, an attacker
can use Remote Code Execution to leverage a successful exploit of this
vulnerability into a complete compromise of the BIG-IP system. All
authenticated users can store this attack, regardless of role.

Security Advisory Status

F5 Product Development has assigned ID 814953 (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    |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |15.x  |15.1.0    |15.1.1    |          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IP (LTM, AAM,  |14.x  |14.1.0 -  |14.1.2.4  |          |      |          |
|AFM, Analytics,    |      |14.1.2    |          |          |      |          |
|APM, ASM, DNS, Edge+------+----------+----------+          |      |          |
|Gateway, FPS, GTM, |13.x  |None      |Not       |High      |8.0   |TMUI      |
|Link Controller,   |      |          |applicable|          |      |          |
|PEM,               +------+----------+----------+          |      |          |
|WebAccelerator)    |12.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |7.x   |7.0.0     |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IQ Centralized |6.x   |6.0.0 -   |Not       |Not       |None  |None      |
|Management         |      |6.1.0     |applicable|vulnerable|      |          |
|                   +------+----------+----------+          |      |          |
|                   |5.x   |5.4.0     |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC        |5.x   |5.0.0 -   |Not       |Not       |None  |None      |
|                   |      |5.1.0     |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.

Mitigation

To mitigate this vulnerability, permit only authorized physical access to F5
products. Additionally, only permit management access to F5 products over a
secure network, and limit shell access to trusted users only. 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 - 14.x) and K13092: Overview of securing access to the BIG-IP
system.

Supplemental Information

o K51812227: Understanding Security Advisory versioning
  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 - 15.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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