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             AUSCERT External Security Bulletin Redistribution

            Final - K64721111: vCMP vulnerability CVE-2018-5531
                               31 July 2018


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5531  

Original Bulletin: 

Revision History:  July 31 2018: The vendor advises "The security issue 
                                 described in this article has been resolved 
                                 or does not affect any F5 products. There 
                                 will be no further updates, unless new 
                                 information is discovered."
                   July 25 2018: Initial Release

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Final - K64721111: vCMP vulnerability CVE-2018-5531

Security Advisory

Original Publication Date: Jul 25, 2018
Updated Date: Jul 31, 2018

Applies to (see versions):

  o Product: BIG-IQ, BIG-IQ Centralized Management
      - 6.0.0, 5.4.0, 5.3.0, 5.2.0, 5.1.0, 5.0.0, 4.6.0
  o Product: BIG-IP, BIG-IP AAM, BIG-IP AFM, BIG-IP Analytics, BIG-IP APM,
    Link Controller, BIG-IP LTM, BIG-IP PEM, BIG-IP WebAccelerator
      - 13.1.0, 13.0.1, 13.0.0, 12.1.3, 12.1.2, 12.1.1, 12.1.0, 11.6.3, 11.6.2,
        11.6.1, 11.5.7, 11.5.6, 11.5.5, 11.5.4, 11.5.3, 11.5.2, 11.5.1, 11.2.1
  o Product: Enterprise Manager
      - 3.1.1
  o Product: F5 iWorkflow
      - 2.3.0, 2.2.0, 2.1.0
  o Product: ARX, ARX
      - 6.4.0, 6.3.0, 6.2.0
  o Product: Traffix SDC
      - 5.1.0, 4.4.0
  o Product: Legacy Products, LineRate
      - 2.6.2, 2.6.1, 2.6.0
  o Product: BIG-IQ Cloud and Orchestration
      - 1.0.0

The security issue described in this article has been resolved or does not
affect any F5 products. There will be no further updates, unless new
information is discovered.

Security Advisory Description

Through undisclosed methods, adjacent network attackers can cause a denial of
service for vCMP guest and host systems. Attacks must be sourced from an
adjacent network (Layer 2). (CVE-2018-5531)



An attacker from an adjacent network may be able to cause a denial-of-service
(DoS) attack on the BIG-IP Virtual Clustered Multiprocessing (vCMP) host and
any defined guests by exploiting the vulnerability on the vCMP guest.

BIG-IQ, F5 iWorkflow, Enterprise Manager, ARX, LineRate, and Traffix SDC

There is no impact; these F5 products are not affected by this vulnerability.

Security Advisory Status

F5 Product Development has assigned ID 693744 (BIG-IP) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H64721111 on the Diagnostics >
Identified > High page.

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.

|                   |      |Versions  |Fixes     |          |CVSSv3|Vulnerable|
|Product            |Branch|known to  |introduced|Severity  |score^|component |
|                   |      |be        |in        |          |1     |or feature|
|                   |      |vulnerable|          |          |      |          |
|                   |13.x  |13.0.0 -  |  |          |      |          |
|                   |      |13.1.0    |          |          |      |          |
|BIG-IP (LTM, AAM,  +------+----------+----------+          |      |          |
|AFM, Analytics,    |12.x  |12.1.0 -  |  |          |      |          |
|APM, ASM, DNS, Edge|      |12.1.3    |          |          |      |vCMP guest|
|Gateway, FPS, GTM, +------+----------+----------+High      |7.4   |(Self IP) |
|Link Controller,   |      |11.6.1 -  |          |          |      |          |
|PEM,               |      |11.6.3    |  |          |      |          |
|WebAccelerator)    |11.x  |11.5.1 -  |11.5.7    |          |      |          |
|                   |      |11.5.6    |          |          |      |          |
|                   |      |11.2.1    |          |          |      |          |
|ARX                |6.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
|Enterprise Manager |3.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
|                   |6.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IQ Centralized |5.x   |None      |Not       |Not       |None  |None      |
|Management         |      |          |applicable|vulnerable|      |          |
|                   +------+----------+----------+          |      |          |
|                   |4.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|BIG-IQ Cloud and   |1.x   |None      |Not       |Not       |None  |None      |
|Orchestration      |      |          |applicable|vulnerable|      |          |
|F5 iWorkflow       |2.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
|LineRate           |2.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
|                   |5.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|Not       |      |          |
|Traffix SDC        +------+----------+----------+vulnerable|None  |None      |
|                   |4.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |

^1 The 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.


To mitigate this vulnerability, you can adjust the scheduling in the vCMP host
configuration. To do so, perform the following procedure:

Impact of procedure: The impact of the suggested mitigation depends on the
specific environment. F5 recommends that you test any such changes during a
maintenance window and consider the possible impact on your specific

 1. Log in to the BIG-IP command line.
 2. Use a text editor to create the /config/tmm_init.tcl file if it does not
    already exist.
 3. Configure the scheduling adjustment by adding the following line to the

    realtime yield 3

 4. Save your changes in the text editor and exit to the command line.
 5. Restart the Traffic Management Microkernel (TMM) to apply your changes by
    typing the following command:

    bigstart restart tmm

 6. Repeat steps 1 through 5 for each blade in a VIPRION 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 - 13.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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