ESB-2017.2843 - [Appliance][Virtual] F5 Products: Denial of service - Remote/unauthenticated 2017-11-07

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2843
         K65615624: BIG-IP FastL4 TMM vulnerability CVE-2017-6166
                              7 November 2017

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

Product:           F5 Products
Publisher:         F5 Networks
Operating System:  Network Appliance
                   Virtualisation
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-6166  

Original Bulletin: 
   https://support.f5.com/csp/article/K65615624

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K65615624: BIG-IP FastL4 TMM vulnerability CVE-2017-6166

Security Advisory

Original Publication Date: Nov 07, 2017

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,
    BIG-IP ASM, BIG-IP DNS, BIG-IP Edge Gateway, BIG-IP GTM, BIG-IP Link
    Controller, BIG-IP LTM, BIG-IP PEM, BIG-IP WebAccelerator
      13.0.0, 12.1.2, 12.1.1, 12.1.0, 12.0.0, 11.6.2, 11.6.1, 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, 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

In BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, DNS, Link Controller, PEM, and
WebSafe software 12.0.0 to 12.1.1, in some cases the Traffic Management
Microkernel (TMM) may crash when processing fragmented packets. This
vulnerability affects TMM through a virtual server configured with a FastL4
profile. Traffic processing is disrupted while TMM restarts. If the affected
BIG-IP system is configured as part of a device group, it will trigger a
failover to the peer device. (CVE-2017-6166)

Impact

A remote attacker may be able to cause a BIG-IP system to produce a core file,
disrupting the flow of traffic and causing a failover to a standby system, if
configured. BIG-IP logs will show the notice panic: packet_free: double free! 
error when TMM crashes.

Security Advisory Status

F5 Product Development has assigned ID 557190 (BIG-IP) to this vulnerability.

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 known|Versions known |          |CVSSv3|Vulnerable    |
|Product       |to be         |to be not      |Severity  |score^|component or  |
|              |vulnerable    |vulnerable     |          |2     |feature       |
+--------------+--------------+---------------+----------+------+--------------+
|              |              |13.0.0         |          |      |              |
|BIG-IP LTM    |12.0.0 -      |12.1.2         |Medium    |5.9   |FastL4 profile|
|              |12.1.1        |11.5.1 - 11.6.2|          |      |              |
|              |              |11.2.1         |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |12.0.0 -      |13.0.0         |          |      |              |
|BIG-IP AAM    |12.1.1        |12.1.2         |Medium    |5.9   |FastL4 profile|
|              |              |11.5.1 - 11.6.2|          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |12.0.0 -      |13.0.0         |          |      |              |
|BIG-IP AFM    |12.1.1        |12.1.2         |Medium    |5.9   |FastL4 profile|
|              |              |11.5.1 - 11.6.2|          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |              |13.0.0         |          |      |              |
|BIG-IP        |12.0.0 -      |12.1.2         |Medium    |5.9   |FastL4 profile|
|Analytics     |12.1.1        |11.5.1 - 11.6.2|          |      |              |
|              |              |11.2.1         |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |              |13.0.0         |          |      |              |
|BIG-IP APM    |12.0.0 -      |12.1.2         |Medium    |5.9   |FastL4 profile|
|              |12.1.1        |11.5.1 - 11.6.2|          |      |              |
|              |              |11.2.1         |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |              |13.0.0         |          |      |              |
|BIG-IP ASM    |12.0.0 -      |12.1.2         |Medium    |5.9   |FastL4 profile|
|              |12.1.1        |11.5.1 - 11.6.2|          |      |              |
|              |              |11.2.1         |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IP DNS    |12.0.0 -      |13.0.0         |Medium    |5.9   |FastL4 profile|
|              |12.1.1        |12.1.2         |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IP Edge   |None          |11.2.1         |Not       |None  |None          |
|Gateway       |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IP GTM    |None          |11.5.1 - 11.6.2|Not       |None  |None          |
|              |              |11.2.1         |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |              |13.0.0         |          |      |              |
|BIG-IP Link   |12.0.0 -      |12.1.2         |Medium    |5.9   |FastL4 profile|
|Controller    |12.1.1        |11.5.1 - 11.6.2|          |      |              |
|              |              |11.2.1         |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |12.0.0 -      |13.0.0         |          |      |              |
|BIG-IP PEM    |12.1.1        |2.1.2          |Medium    |5.9   |FastL4 profile|
|              |              |11.5.1 - 11.6.2|          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IP        |None          |11.2.1         |Not       |None  |None          |
|WebAccelerator|              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |12.0.0 -      |13.0.0         |          |      |              |
|F5 WebSafe    |12.1.1        |2.1.2          |Medium    |5.9   |FastL4 profile|
|              |              |11.6.2         |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|ARX           |None          |6.2.0 - 6.4.0  |Not       |None  |None          |
|              |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|Enterprise    |None          |3.1.1          |Not       |None  |None          |
|Manager       |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IQ Cloud  |None          |4.4.0 - 4.5.0  |Not       |None  |None          |
|              |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IQ Device |None          |4.4.0 - 4.5.0  |Not       |None  |None          |
|              |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IQ        |None          |4.4.0 - 4.5.0  |Not       |None  |None          |
|Security      |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IQ ADC    |None          |4.5.0          |Not       |None  |None          |
|              |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IQ        |              |5.0.0 - 5.3.0  |Not       |      |              |
|Centralized   |None          |4.6.0          |vulnerable|None  |None          |
|Management    |              |               |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|BIG-IQ Cloud  |              |               |Not       |      |              |
|and           |None          |1.0.0          |vulnerable|None  |None          |
|Orchestration |              |               |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+
|F5 iWorkflow  |None          |2.0.0 - 2.3.0  |Not       |None  |None          |
|              |              |               |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|LineRate      |2.5.0 - 2.6.2 |2.5.0 - 2.6.2  |Not       |None  |None          |
|              |None          |None           |vulnerable|      |              |
+--------------+--------------+---------------+----------+------+--------------+
|              |              |5.0.0 - 5.1.0  |Not       |      |              |
|Traffix SDC   |None          |4.0.0 - 4.4.0  |vulnerable|None  |None          |
|              |              |               |          |      |              |
+--------------+--------------+---------------+----------+------+--------------+

^1 The specified products contain the affected code. However, F5 identifies the
vulnerability status as Not vulnerable because the attacker cannot exploit the
code in default, standard, or recommended configurations.

^2The 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 Versions known to be not vulnerable 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 determine the necessary upgrade path for your BIG-IQ system, you should
understand the BIG-IQ product offering name changes. For more information,
refer to K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems
.

Mitigation

To mitigate this vulnerability, you can enable the Reassemble IP Fragments
option in the FastL4 profile.  To do so, perform the following procedure:

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

 1. Log in to the BIG-IP Configuration utility as an administrative user.
 2. Navigate to Virtual Servers > Profiles > Protocol > FastL4.
 3. Select the Reassemble IP Fragments option.
 4. Click Update.

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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