ESB-2018.0614.2 - UPDATE [Appliance] F5 BIG-IP TMM: Denial of service - Remote/unauthenticated 2018-03-05

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             AUSCERT External Security Bulletin Redistribution

             K62712037: BIG-IP TMM vulnerability CVE-2017-6150
                               5 March 2018


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP TMM
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-6150  

Original Bulletin:

Revision History:  March 5 2018: Bulletin updated with mitigating steps
                   March 2 2018: Initial Release

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K62712037: BIG-IP TMM vulnerability CVE-2017-6150

Security Advisory

Original Publication Date: Mar 01, 2018
Updated Date: Mar 03, 2018

Applies to (see versions):

  o Product: BIG-IQ, BIG-IQ Cloud, BIG-IQ Device, BIG-IQ Security, BIG-IQ ADC,
    BIG-IQ Centralized Management
      - 5.3.0, 5.2.0, 5.1.0, 5.0.0, 4.6.0, 4.5.0, 4.4.0
  o Product: BIG-IP, BIG-IP AAM, BIG-IP AFM, BIG-IP Analytics, BIG-IP APM,
    Controller, BIG-IP LTM, BIG-IP PEM, BIG-IP PSM, BIG-IP WebAccelerator
      - 13.0.0, 12.1.2, 12.1.1, 12.1.0, 12.0.0, 11.6.1, 11.6.0, 11.5.4, 11.5.3,
        11.5.2, 11.5.1, 11.5.0, 11.4.1, 11.2.1
  o Product: Enterprise Manager
      - 3.1.1
  o Product: F5 iWorkflow
      - 2.3.0, 2.2.0, 2.1.0, 2.0.2, 2.0.1, 2.0.0
  o Product: LineRate
      - 2.6.2, 2.6.1, 2.6.0, 2.5.3, 2.5.2, 2.5.1, 2.5.0
  o Product: ARX, ARX
      - 6.4.0, 6.3.0, 6.2.0
  o Product: F5 WebSafe
      - 1.0.0
  o Product: Traffix SDC
      - 5.1.0, 4.4.0, 4.0.5, 4.0.2, 4.0.0
  o Product: BIG-IQ Cloud and Orchestration
      - 1.0.0

Security Advisory Description

Under certain conditions for BIG-IP systems using FastL4 profiles, when the
Reassemble IP Fragments option is disabled (default), some specific large
fragmented packets may restart the Traffic Management Microkernel (TMM). (
CVE-2017-6150 )


An attacker may be able to perform a denial-of-service (DoS) attack by causing
the Traffic Management Microkernel (TMM) to restart.

Security Advisory Status

F5 Product Development has assigned ID 673078 (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.

|                   |      |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 -  |  |          |      |FastL4    |
|APM, ASM, DNS, Link|      |12.1.3    |          |High      |7.5   |virtual   |
|Controller, PEM,   +------+----------+----------+          |      |server    |
|WebSafe)           |11.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|ARX                |6.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
|Enterprise Manager |3.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
|BIG-IQ (Cloud,     |      |          |Not       |Not       |      |          |
|Device, Security,  |4.x   |None      |applicable|vulnerable|None  |None      |
|ADC)               |      |          |          |          |      |          |
|                   |5.x   |None      |Not       |          |      |          |
|BIG-IQ Centralized |      |          |applicable|Not       |      |          |
|Management         +------+----------+----------+vulnerable|None  |None      |
|                   |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|          |      |          |

^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.

Note: For details about how Security Advisory articles are versioned, and what
versions are listed in the table, refer to K51812227: Understanding Security
Advisory versioning.


To mitigate this vulnerability, enable the Reassemble IP Fragments option;
however this will demote the BIG-IP system using hardware acceleration to
software mode.

F5 recommends reviewing the configuration impact on the FastL4 profile before
you implement the mitigation. For more information, refer to K09948701:
Overview of the FastL4 profile. In addition, to understand more about how the
BIG-IP system process the IP fragment, refer to K9012: The BIG-IP LTM IP
fragment processing.

To enable the Reassemble IP Fragments option, perform one of the following

Impact of action: BIG-IP system that uses hardware acceleration will be demoted
to software mode when the Reassemble IP Fragments option is enabled.

Enabling the Reassemble IP Fragments option using the Configuration utility

 1. Log in to the BIG-IP configuration utility.
 2. Navigate to Local Traffic > Profiles > Protocol > Fast L4.
 3. Click on the name of the affected FastL4 profile.
 4. Select the Custom box for the Reassemble IP Fragments option.
 5. Select the box next to the Reassemble IP Fragments option to enable it.
 6. To save the changes, click Update.

Enabling the Reassemble IP Fragments option using the tmsh utility

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


 2. Enable the option using the following command syntax:

    modify /ltm profile fastl4 <ProfileName> reassemble-fragments enabled

    For example:

    modify /ltm profile fastl4 myprofile reassemble-fragments enabled

 3. Save the changes by typing the following command:

    save /sys config

 4. Exit the tmsh utility by typing the following command:


Supplemental Information

  o K9970: Subscribing to email notifications regarding F5 products
  o K9957: Creating a custom RSS feed to view new and updated documents
  o K4602: Overview of the F5 security vulnerability response policy
  o K4918: Overview of the F5 critical issue hotfix policy
  o K167: Downloading software and firmware from F5
  o K13123: Managing BIG-IP product hotfixes (11.x - 13.x)
  o K9502: BIG-IP hotfix matrix

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