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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0512
The BIG-IP ASM system may not properly perform signature checks on cookies
                             11 February 2021

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

Product:           The BIG-IP (ASM)
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Reduced Security -- Unknown/Unspecified
Resolution:        Patch/Upgrade

Original Bulletin: 
   https://support.f5.com/csp/article/K88162221

- --------------------------BEGIN INCLUDED TEXT--------------------

K88162221: The BIG-IP ASM system may not properly perform signature checks on
cookies

Original Publication Date: 11 Feb, 2021

Security Advisory Description

The BIG-IP ASM system may not properly perform signature checks on cookies.

This issue occurs when the following condition is met:

  o You have a security policy enabled with cookie scope attack signatures.

Impact

Cookies containing malicious payload may pass through the system without
logging a violation.

Symptoms

As a result of this issue, you may encounter the following symptom:

  o Some attack signatures do not match a cookie with malicious content, and
    the system forwards the cookie to the backend hosts without logging a
    violation.

Security Advisory Status

F5 Product Development has assigned ID 918933 to this issue. F5 has confirmed
that this issue exists in the products listed in the Applies to (see versions)
box, located in the upper-right corner of this article. For information about
releases, point releases, or hotfixes that resolve this issue, refer to the
following table.

+------------------+-----------------+----------------------------------------+
|Type of fix       |Fixes introduced |Related articles                        |
|                  |in               |                                        |
+------------------+-----------------+----------------------------------------+
|Release           |15.1.2           |K2200: Most recent versions of F5       |
|                  |                 |software                                |
+------------------+-----------------+----------------------------------------+
|Point release/    |16.0.1.1         |K9502: BIG-IP hotfix and point release  |
|hotfix            |14.1.2.8         |matrix                                  |
|                  |13.1.3.6         |                                        |
+------------------+-----------------+----------------------------------------+

Security Advisory Recommended Actions

Workaround

None

Supplemental Information

o K51812227: Understanding security advisory versioning
  o K41942608: Overview of AskF5 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

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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