ESB-2017.2673 - [Appliance] F5 BIG-IP Products: Denial of service - Remote/unauthenticated 2017-10-24

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2673
        K21154730: TMM SSL/TLS profile vulnerability CVE-2017-6141
                              24 October 2017

===========================================================================

        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-2017-6141  

Original Bulletin: 
   https://support.f5.com/csp/article/K21154730

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

K21154730: TMM SSL/TLS profile vulnerability CVE-2017-6141

Security Advisory

Original Publication Date: Jul 13, 2017
Updated Date: Jul 19, 2017

Security Advisory Description

Certain values in a TLS abbreviated handshake when using a client SSL profile
with the Session Ticket option enabled may cause disruption of service to the
Traffic Management Microkernel (TMM). The Session Ticket option is disabled by
default. (CVE-2017-6141)

Impact

The Traffic Management Microkernel (TMM) may restart and temporarily fail to
process traffic.

Security Advisory Status

F5 Product Development has assigned ID 620400 (BIG-IP) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H21154730 on the Diagnostics >
Identified > High screen.

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    |Versions known|          |Vulnerable component or|
|Product       |known to be |to be not     |Severity  |feature                |
|              |vulnerable  |vulnerable    |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |            |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP LTM    |12.1.0 -    |12.0.0        |High      |the Session Ticket     |
|              |12.1.2      |11.4.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
|              |            |11.2.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |12.1.0 -    |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP AAM    |12.1.2      |12.0.0        |High      |the Session Ticket     |
|              |            |11.4.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |12.1.0 -    |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP AFM    |12.1.2      |12.0.0        |High      |the Session Ticket     |
|              |            |11.4.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |            |12.0.0 -      |          |                       |
|BIG-IP        |None        |12.1.2        |Not       |None                   |
|Analytics     |            |11.4.0 -      |vulnerable|                       |
|              |            |11.6.1        |          |                       |
|              |            |11.2.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |            |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP APM    |12.1.0 -    |12.0.0        |High      |the Session Ticket     |
|              |12.1.2      |11.4.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
|              |            |11.2.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |            |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP ASM    |12.1.0 -    |12.0.0        |High      |the Session Ticket     |
|              |12.1.2      |11.4.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
|              |            |11.2.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |Not       |                       |
|BIG-IP DNS    |None        |12.0.0 -      |vulnerable|None                   |
|              |            |12.1.2        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IP Edge   |None        |11.2.1        |Not       |None                   |
|Gateway       |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |11.4.0 -      |Not       |                       |
|BIG-IP GTM    |None        |11.6.1        |vulnerable|None                   |
|              |            |11.2.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |            |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP Link   |12.1.0 -    |12.0.0        |High      |the Session Ticket     |
|Controller    |12.1.2      |11.4.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
|              |            |11.2.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |12.1.0 -    |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP PEM    |12.1.2      |12.0.0        |High      |the Session Ticket     |
|              |            |11.4.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IP PSM    |None        |11.4.0 -      |Not       |None                   |
|              |            |11.4.1        |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IP        |None        |11.2.1        |Not       |None                   |
|WebAccelerator|            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|              |            |13.0.0        |          |                       |
|              |12.1.0 -    |12.1.2 HF1    |          |Client SSL profile with|
|BIG-IP WebSafe|12.1.2      |12.0.0        |High      |the Session Ticket     |
|              |            |11.6.0 -      |          |option enabled         |
|              |            |11.6.1        |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|ARX           |None        |6.2.0 - 6.4.0 |Not       |None                   |
|              |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|Enterprise    |None        |3.1.1         |Not       |None                   |
|Manager       |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IQ Cloud  |None        |4.4.0 - 4.5.0 |Not       |None                   |
|              |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IQ Device |None        |4.4.0 - 4.5.0 |Not       |None                   |
|              |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IQ        |None        |4.4.0 - 4.5.0 |Not       |None                   |
|Security      |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IQ ADC    |None        |4.5.0         |Not       |None                   |
|              |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IQ        |            |5.0.0 - 5.2.0 |Not       |                       |
|Centralized   |None        |4.6.0         |vulnerable|None                   |
|Management    |            |              |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|BIG-IQ Cloud  |            |              |Not       |                       |
|and           |None        |1.0.0         |vulnerable|None                   |
|Orchestration |            |              |          |                       |
+--------------+------------+--------------+----------+-----------------------+
|F5 iWorkflow  |None        |2.0.0 - 2.2.0 |Not       |None                   |
|              |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|LineRate      |None        |2.5.0 - 2.6.2 |Not       |None                   |
|              |            |              |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+
|Traffix SDC   |None        |5.0.0 - 5.1.0 |Not       |None                   |
|              |            |4.0.0 - 4.4.0 |vulnerable|                       |
+--------------+------------+--------------+----------+-----------------------+

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.

Mitigation

There is no mitigation. To determine if you have the Session Ticket option
enabled in a Client SSL profile, perform one of the following procedures:

Using the Configuration utility to determine whether the Session Ticket option
is enabled

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

 1. Log in to the Configuration utility.
 2. Navigate to Local Traffic > Profiles > SSL > Client.
 3. Click the Name of your Client SSL profile.
 4. From the Configuration menu, select Advanced.
 5. In the Configuration section, locate the Session Ticket option.

    The option is enabled when the box is checked.

Using tmsh to determine whether the Session Ticket option is enabled

Impact of action: 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:

    tmsh

 2. Determine whether the Session Ticket option is enabled using the following
    command syntax:

    list /ltm profile client-ssl <profile name> session-ticket

    For example, determine the Session Ticket option setting for a profile
    named my_client_ssl, by typing the following command:

    list /ltm profile client-ssl my_client_ssl session-ticket

    If the option is enabled, the output will appear similar to the following
    example:

    ltm profile client-ssl my_client_ssl {
        session-ticket enabled
    }

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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