ESB-2017.2687 - [Appliance] F5 products: Denial of service - Remote/unauthenticated 2017-10-24

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2687
            K81211720: Linux kernel vulnerability CVE-2017-6214
                              24 October 2017

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

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

Product:           F5 products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2017-6214  

Reference:         ASB-2017.0141
                   ASB-2017.0067
                   ESB-2017.2379
                   ESB-2017.1179
                   ESB-2017.1136
                   ESB-2017.0614

Original Bulletin: 
   https://support.f5.com/csp/article/K81211720

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K81211720: Linux kernel vulnerability CVE-2017-6214

Security Advisory

Original Publication Date: Apr 14, 2017
Updated Date: Oct 24, 2017

Security Advisory Description

The tcp_splice_read function in net/ipv4/tcp.c in the Linux kernel before
4.9.11 allows remote attackers to cause a denial of service (infinite loop and
soft lockup) via vectors involving a TCP packet with the URG flag. (
CVE-2017-6214)

Impact

An attacker, using a specially crafted TCP packet, can force the kernel to
enter an infinite loop condition.

Security Advisory Status

F5 Product Development has assigned IDs 653879 and 653880 (BIG-IP), ID 654212
(BIG-IQ), ID 654205 (Enterprise Manager), ID 655792 (F5 iWorkflow), and
INSTALLER-2978, INSTALLER-2979, INSTALLER-2980, and INSTALLER-2981 (Traffix
SDC) to this vulnerability. Additionally, BIG-IP iHealth may list Heuristic
H81211720 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 known  |Versions known to|          |Vulnerable      |
|Product        |to be vulnerable|be not vulnerable|Severity  |component or    |
|               |                |                 |          |feature         |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP LTM     |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|               |11.4.0 - 11.6.1 |                 |          |                |
|               |11.2.1          |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP AAM     |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|               |11.4.0 - 11.6.1 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP AFM     |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|               |11.4.0 - 11.6.1 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP         |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|Analytics      |11.4.0 - 11.6.1 |                 |          |                |
|               |11.2.1          |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP APM     |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|               |11.4.0 - 11.6.1 |                 |          |                |
|               |11.2.1          |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP ASM     |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|               |11.4.0 - 11.6.1 |                 |          |                |
|               |11.2.1          |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP DNS     |13.0.0          |None             |High      |Linux kernel    |
|               |12.0.0 - 12.1.2 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP Edge    |11.2.1          |None             |High      |Linux kernel    |
|Gateway        |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP GTM     |11.4.0 - 11.6.1 |11.5.5           |High      |Linux kernel    |
|               |11.2.1          |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP Link    |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|Controller     |11.4.0 - 11.6.1 |                 |          |                |
|               |11.2.1          |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP PEM     |12.0.0 - 12.1.2 |11.5.5           |High      |Linux kernel    |
|               |11.4.0 - 11.6.1 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP PSM     |11.4.0 - 11.4.1 |None             |High      |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP         |11.2.1          |None             |High      |Linux kernel    |
|WebAccelerator |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |                |
|BIG-IP WebSafe |12.0.0 - 12.1.2 |None             |High      |Linux kernel    |
|               |11.6.0 - 11.6.1 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|ARX            |None            |6.2.0 - 6.4.0    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|Enterprise     |3.1.1           |None             |High      |Linux kernel    |
|Manager        |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |4.4.0 - 4.5.0   |None             |High      |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Device  |4.4.0 - 4.5.0   |None             |High      |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Security|4.4.0 - 4.5.0   |None             |High      |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ ADC     |4.5.0           |None             |High      |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ         |5.0.0 - 5.1.0   |                 |          |                |
|Centralized    |4.6.0           |None             |High      |Linux kernel    |
|Management     |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |                |                 |          |                |
|and            |1.0.0           |None             |High      |Linux kernel    |
|Orchestration  |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|F5 iWorkflow   |2.0.0 - 2.1.0   |None             |High      |Linux kernel    |
+---------------+----------------+-----------------+----------+----------------+
|LineRate       |None            |2.5.0 - 2.6.2    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|Traffix SDC    |5.0.0 - 5.1.0   |None             |High      |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.

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 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)
and K13092: Overview of securing access to the BIG-IP system.

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

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