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             AUSCERT External Security Bulletin Redistribution

      BIG-IP engineering hotfix Trusted Platform Module vulnerability
                              14 January 2020


        AusCERT Security Bulletin Summary

Product:           BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2020-5851  

Original Bulletin: 

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K91171450:BIG-IP engineering hotfix Trusted Platform Module vulnerability 

Security Advisory

Original Publication Date: 14 Jan, 2020

Security Advisory Description

On impacted versions and platforms, the Trusted Platform Module (TPM) system
integrity check cannot detect modifications to specific system components. (


The Trusted Platform Module (TPM) on the BIG-IP iSeries platforms (i850, i2000,
i4000, i5000, i7000, i10000, i11000, i15000) and the VIPRION B4450 blades fails
to function properly and is unable to detect any potential security compromise
of the affected systems. This does not impact any other hardware platform.

Important: This vulnerability impacts only BIG-IP Engineering hotfixes obtained
from F5 Support. Refer to the table in the following section for the list of
affected versions. To verify if you are running an affected version from this
list, perform the procedure in the Recommended Actions section. This
vulnerability does not affect any of the BIG-IP major, minor, maintenance, or
point releases you obtained from F5 Downloads.

BIG-IQ / Traffix SDC:
There is no impact; these F5 products are not affected by this vulnerability.

Security Advisory Status

F5 Product Development has assigned ID 788033 (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 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.

|               |      |                                 |Fixes     |          |CVSSv3|Vulnerable|
|Product        |Branch|Versions known to be vulnerable  |introduced|Severity  |score^|component |
|               |      |                                 |in        |          |1     |or feature|
|               |15.x  |None                             |Not       |          |      |          |
|               |      |                                 |applicable|          |      |          |
|               +------+---------------------------------+----------+          |      |          |
|BIG-IP (LTM,   |      |Hotfix-BIGIP-^|          |          |      |          |
|AAM, AFM,      |14.x  |2                                |Not       |          |      |          |
|Analytics, APM,|      |Hotfix-BIGIP-^|applicable|          |      |          |
|ASM, DNS, Edge |      |2                                |          |          |      |          |
|Gateway, FPS,  +------+---------------------------------+----------+Medium    |4.6   |TPM       |
|GTM, Link      |13.x  |None                             |Not       |          |      |          |
|Controller,    |      |                                 |applicable|          |      |          |
|PEM,           +------+---------------------------------+----------+          |      |          |
|WebAccelerator)|12.x  |None                             |Not       |          |      |          |
|               |      |                                 |applicable|          |      |          |
|               +------+---------------------------------+----------+          |      |          |
|               |11.x  |None                             |Not       |          |      |          |
|               |      |                                 |applicable|          |      |          |
|               |6.x   |None                             |Not       |          |      |          |
|BIG-IQ         |      |                                 |applicable|Not       |      |          |
|Centralized    +------+---------------------------------+----------+vulnerable|None  |None      |
|Management     |5.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.

^2This vulnerability affects only the following items: these engineering
hotfixes based on BIG-IP; BIG-IP iSeries platforms; and VIPRION B4450
blades. It does not affect any of the BIG-IP major, minor, maintenance, or
point releases you obtained from F5 Downloads.

Security Advisory Recommended Actions

Your BIG-IP system is affected by this vulnerability when your BIG-IP system
(the BIG-IP iSeries platforms or the VIPRION B4450 blades) is running an
engineering hotfix version listed in the table. To verify your BIG-IP system's
version and hardware platform, perform the following procedure:

Impact of procedure: Performing the following procedure should not have a
negative impact on your system.

 1. Log in to the TMOS Shell (tmsh) by typing the following command:


 2. Display your BIG-IP system hardware platform by typing the following

    show /sys hardware

    If your BIG-IP hardware platform is neither the BIG-IP iSeries platforms
    nor the VIPRION B4450 blade, your system is not vulnerable.

    If your BIG-IP hardware platform is either the BIG-IP iSeries platforms or
    the VIPRION B4450 blade, do the following to determine the BIG-IP version:

       Enter the following command:

        show /sys version

        Your BIG-IP version displays. If the version is not one of the
        engineering hotfix versions listed in the table, your system is not


After you perform the previous procedure, if you determine that your BIG-IP
version is vulnerable, you can obtain an engineering hotfix by contacting F5
Support, and referencing this article number and the associated ID number. Note
that engineering hotfixes are intended to resolve a specific software issue
until a suitable minor release, maintenance release, or cumulative hotfix
rollup release is available that includes the software fix. For more
information, refer to K8986: F5 software lifecycle policy.

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 K55025573: Engineering hotfix installation overview
  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
  o K58311205: Overview of Local Attestation and Remote Attestation with TPM on
    the BIG-IP system
  o The Trusted Platform Module TPM chapter of the BIG-IP System: Essentials

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

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