ESB-2019.0284 - [Appliance] F5 BIG-IP TMM: Denial of service - Remote/unauthenticated 2019-01-31

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0284
                K55101404: TMM vulnerability CVE-2019-6590
                              31 January 2019

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        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-2019-6590  

Original Bulletin: 
   https://support.f5.com/csp/article/K55101404

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K55101404: TMM vulnerability CVE-2019-6590

Security Advisory

Original Publication Date: Jan 30, 2019

Applies to (see versions):

  o Product: BIG-IQ, BIG-IQ Centralized Management
      o 6.1.0, 6.0.1, 6.0.0, 5.4.0, 5.3.0, 5.2.0, 5.1.0, 5.0.0
  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 FPS, BIG-IP GTM, BIG-IP
    Link Controller, BIG-IP LTM, BIG-IP PEM, BIG-IP WebAccelerator
      o 14.1.0, 14.0.0, 13.1.1, 13.1.0, 13.0.1, 13.0.0, 12.1.4, 12.1.3, 12.1.2,
        12.1.1, 12.1.0, 11.6.3, 11.6.2, 11.6.1, 11.5.8, 11.5.7, 11.5.6, 11.5.5,
        11.5.4, 11.5.3, 11.5.2, 11.5.1
  o Product: Enterprise Manager
      o 3.1.1
  o Product: F5 iWorkflow
      o 2.3.0
  o Product: Traffix SDC
      o 5.1.0, 5.0.0, 4.4.0

Security Advisory Description

Under certain conditions, the TMM may consume excessive resources when
processing SSL Session ID Persistence traffic. (CVE-2019-6590)

Impact

BIG-IP

This vulnerability may result as a denial-of-service (DOS) attack on the
affected BIG-IP system when the system consumes excessive memory resources.
This issue affects only BIG-IP systems provisioned with the LTM module. The
affected BIG-IP system temporarily fails to process traffic as it recovers from
a Traffic Management Microkernel (TMM) restart, and devices configured in a
device group may fail over.

Enterprise Manager / BIG-IQ / iWorkflow / Traffix SDC

There is no impact for these F5 products as they are not affected by this
vulnerability.

Security Advisory Status

F5 Product Development has assigned ID 661828 (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.

+------------------+------+----------+----------+-----------+------+----------+
|                  |      |Versions  |Fixes     |           |CVSSv3|Vulnerable|
|Product           |Branch|known to  |introduced|Severity   |score |component |
|                  |      |be        |in        |           |      |or feature|
|                  |      |vulnerable|          |           |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|                  |14.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
|                  +------+----------+----------+           |      |          |
|                  |13.x  |13.0.0 -  |13.1.0    |           |      |          |
|                  |      |13.0.1    |          |           |      |          |
|BIG-IP (LTM)      +------+----------+----------+Medium     |5.3   |TMM       |
|                  |12.x  |12.1.0 -  |12.1.3.7  |           |      |          |
|                  |      |12.1.3    |          |           |      |          |
|                  +------+----------+----------+           |      |          |
|                  |11.x  |11.5.1 -  |None      |           |      |          |
|                  |      |11.6.3    |          |           |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|                  |14.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
|BIG-IP (AAM, AFM, +------+----------+----------+           |      |          |
|Analytics, APM,   |13.x  |None      |Not       |           |      |          |
|ASM, DNS, Edge    |      |          |applicable|Not        |      |          |
|Gateway, FPS, GTM,+------+----------+----------+vulnerable^|None  |None      |
|Link Controller,  |12.x  |None      |Not       |1          |      |          |
|PEM,              |      |          |applicable|           |      |          |
|WebAccelerator)   +------+----------+----------+           |      |          |
|                  |11.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|Enterprise Manager|3.x   |None      |Not       |Not        |None  |None      |
|                  |      |          |applicable|vulnerable |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|                  |6.x   |None      |Not       |           |      |          |
|BIG-IQ Centralized|      |          |applicable|Not        |      |          |
|Management        +------+----------+----------+vulnerable |None  |None      |
|                  |5.x   |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|F5 iWorkflow      |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 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.

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.

Mitigation

To avoid this vulnerability, you can use an alternative persistence type such
as source address affinity if your application environment permits.

Impact of action: Depending on your application environment, using an
alternative persistence type may cause the system to distribute and persist
connections unevenly across multiple pool members. F5 recommends that you test
such changes in an appropriate environment.

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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