ESB-2019.0693 - [Appliance] F5 BIG-IP products: Denial of Service -- Existing Account 2019-03-06

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0693
                    Kernel vulnerability CVE-2016-6828
                               6 March 2019

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

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

Product:           F5 BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-6828  

Reference:         ASB-2016.0103
                   ESB-2017.0456
                   ESB-2017.0273
                   ESB-2017.0132
                   ESB-2017.0131
                   ESB-2017.0029
                   ESB-2016.2856
                   ESB-2016.2687

Original Bulletin: 
   https://support.f5.com/csp/article/K62442245

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K62442245:Kernel vulnerability CVE-2016-6828

Security Advisory

Original Publication Date: 21 Dec, 2016

Latest   Publication Date: 06 Mar, 2019

Security Advisory Description

The tcp_check_send_head function in include/net/tcp.h in the Linux kernel
before 4.7.5 does not properly maintain certain SACK state after a failed data
copy, which allows local users to cause a denial of service
(tcp_xmit_retransmit_queue use-after-free and system crash) via a crafted SACK
option. (CVE-2016-6828)

Impact

A local user may cause a denial-of-service (DoS) by way of a crafted SACK
option.

Security Advisory Status

F5 Product Development has assigned IDs 633655, 633656, and 624722 (BIG-IP), ID
633602 (BIG-IQ), ID 634365 (Enterprise Manager) and ID 634431 (F5 iWorkflow) to
this vulnerability. Additionally, BIG-IP iHealth may list Heuristic H635143 on
the Diagnostics > Identified > Medium 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 known  |Versions known to|          |Vulnerable      |
|Product        |to be vulnerable|be not vulnerable|Severity  |component or    |
|               |                |                 |          |feature         |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|               |12.0.0 - 12.1.4 |13.0.1           |          |                |
|BIG-IP LTM     |11.4.0 - 11.6.3 |13.0.0 HF2       |Medium    |Linux kernel    |
|               |11.2.1          |                 |          |                |
|               |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.0.1           |          |                |
|BIG-IP AAM     |12.0.0 - 12.1.4 |13.0.0 HF2       |Medium    |Linux kernel    |
|               |11.4.0 - 11.6.3 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.0.1           |          |                |
|BIG-IP AFM     |12.0.0 - 12.1.4 |13.0.0 HF2       |Medium    |Linux kernel    |
|               |11.4.0 - 11.6.3 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP         |12.0.0 - 12.1.4 |13.0.1           |Medium    |Linux kernel    |
|Analytics      |11.4.0 - 11.6.3 |13.0.0 HF2       |          |                |
|               |11.2.1          |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|               |12.0.0 - 12.1.4 |13.0.1           |          |                |
|BIG-IP APM     |11.4.0 - 11.6.3 |13.0.0 HF2       |Medium    |Linux kernel    |
|               |11.2.1          |                 |          |                |
|               |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|               |12.0.0 - 12.1.4 |13.0.1           |          |                |
|BIG-IP ASM     |11.4.0 - 11.6.3 |13.0.0 HF2       |Medium    |Linux kernel    |
|               |11.2.1          |                 |          |                |
|               |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP DNS     |13.0.0          |13.0.1           |Medium    |Linux kernel    |
|               |12.0.0 - 12.1.4 |13.0.0 HF2       |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP Edge    |11.2.1          |None             |Medium    |Linux kernel    |
|Gateway        |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |11.4.0 - 11.6.3 |                 |          |                |
|BIG-IP GTM     |11.2.1          |None             |Medium    |Linux kernel    |
|               |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP Link    |12.0.0 - 12.1.4 |13.0.1           |          |                |
|Controller     |11.4.0 - 11.6.3 |13.0.0 HF2       |Medium    |Linux kernel    |
|               |11.2.1          |                 |          |                |
|               |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.0.1           |          |                |
|BIG-IP PEM     |12.0.0 - 12.1.4 |13.0.0 HF2       |Medium    |Linux kernel    |
|               |11.4.0 - 11.6.3 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP PSM     |11.4.0 - 11.4.1 |None             |Medium    |Linux kernel    |
|               |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP         |11.2.1          |None             |Medium    |Linux kernel    |
|WebAccelerator |10.2.1 - 10.2.4 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.0.1           |Medium    |                |
|BIG-IP WebSafe |12.0.0 - 12.1.4 |13.0.0 HF2       |          |Linux kernel    |
|               |11.4.0 - 11.6.3 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|ARX            |None            |6.2.0 - 6.4.0    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|Enterprise     |3.1.1           |None             |Medium    |Linux kernel    |
|Manager        |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |4.0.0 - 4.5.0   |None             |Medium    |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Device  |4.2.0 - 4.5.0   |None             |Medium    |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Security|4.0.0 - 4.5.0   |None             |Medium    |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ ADC     |4.5.0           |None             |Medium    |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ         |6.0.0 - 6.1.0   |                 |          |                |
|Centralized    |5.0.0 - 5.4.0   |None             |Medium    |Linux kernel    |
|Management     |4.6.0           |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |                |                 |          |                |
|and            |1.0.0           |None             |Medium    |Linux kernel    |
|Orchestration  |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|F5 iWorkflow   |2.0.0 - 2.3.0   |None             |Medium    |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|LineRate       |None            |2.5.0 - 2.6.1    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|Traffix SDC    |5.0.0 - 5.1.0   |None             |Low       |Linux kernel    |
|               |4.0.0 - 4.4.0   |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+

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

To mitigate this vulnerability, you should permit management access to F5
products only over a secure network and restrict command line access for
affected systems to only trusted users. For more information, refer to K13309:
Restricting access to the Configuration utility by source IP address (11.x -
14.x) and K13092: Overview of securing access to the BIG-IP system.

Supplemental Information

o K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems
  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

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