ESB-2017.2825.4 - UPDATE [Linux][Appliance] F5 products: Root compromise - Existing account 2018-04-05

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2017.2825.4
            K05513373: Linux kernel vulnerability CVE-2016-9576
                               5 April 2018

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

Product:           F5 products
Publisher:         F5 Networks
Operating System:  Network Appliance
                   Linux variants
Impact/Access:     Root Compromise   -- Existing Account
                   Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-9576  

Reference:         ESB-2017.2789
                   ESB-2017.2233
                   ESB-2017.1890
                   ESB-2017.1872
                   ESB-2017.1039
                   ESB-2017.0757

Original Bulletin: 
   https://support.f5.com/csp/article/K05513373

Revision History:  April     5 2018: Updated "Security Advisory Status" section
                   March    26 2018: Further patch released
                   March     2 2018: Updated source text noting root compromise.
                   November  6 2017: Initial Release

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K05513373:Linux kernel vulnerability  CVE-2016-9576

Security Advisory

Original Publication Date: 28 Jan, 2017

Latest   Publication Date: 30 Mar, 2018

Security Advisory Description

The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before
4.8.14 does not properly restrict the type of iterator, which allows local
users to read or write to arbitrary kernel memory locations or cause a denial
of service (use-after-free) by leveraging access to a /dev/sg device. (
CVE-2016-9576)

Impact

This vulnerability may allow locally authenticated users to read or write to
arbitrary kernel memory locations or cause a denial of service (DoS).

Note: The exploit requires local shell access and can provide a user with root
access to the system. On BIG-IP systems, shell access includes root
privileges, making this exploit unnecessary.


Security Advisory Status

F5 Product Development has assigned IDs 640766 and 640768 (BIG-IP), and IDs
640766 and 640768 (BIG-IQ, Enterprise Manager, iWorkflow) to this
vulnerability. Additionally, BIG-IP iHealth may list Heuristic H05513373 on
the Diagnostics > Identified > Low page.

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          |be not vulnerable|Severity  |component or   |
|               |vulnerable     |                 |          |feature        |
+---------------+---------------+-----------------+----------+---------------+
|               |13.0.0 - 13.1.0|13.1.0.4         |          |               |
|               |12.0.0 - 12.1.2|13.0.1           |          |               |
|BIG-IP LTM     |11.4.0 - 11.6.1|12.1.3           |Low       |Linux kernel   |
|               |11.2.1         |11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |               |13.1.0.4         |          |               |
|               |13.0.0 - 13.1.0|13.0.1           |          |               |
|BIG-IP AAM     |12.0.0 - 12.1.2|12.1.3           |Low       |Linux kernel   |
|               |11.4.0 - 11.6.1|11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |               |13.1.0.4         |          |               |
|               |13.0.0 - 13.1.0|13.0.1           |          |               |
|BIG-IP AFM     |12.0.0 - 12.1.2|12.1.3           |Low       |Linux kernel   |
|               |11.4.0 - 11.6.1|11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |13.0.0 - 13.1.0|13.1.0.4         |          |               |
|BIG-IP         |12.0.0 - 12.1.2|13.0.1           |          |               |
|Analytics      |11.4.0 - 11.6.1|12.1.3           |Low       |Linux kernel   |
|               |11.2.1         |11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |13.0.0 - 13.1.0|13.1.0.4         |          |               |
|               |12.0.0 - 12.1.2|13.0.1           |          |               |
|BIG-IP APM     |11.4.0 - 11.6.1|12.1.3           |Low       |Linux kernel   |
|               |11.2.1         |11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |13.0.0 - 13.1.0|13.1.0.4         |          |               |
|               |12.0.0 - 12.1.2|13.0.1           |          |               |
|BIG-IP ASM     |11.4.0 - 11.6.1|12.1.3           |Low       |Linux kernel   |
|               |11.2.1         |11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |13.0.0 - 13.1.0|13.1.0.4         |          |               |
|BIG-IP DNS     |12.0.0 - 12.1.2|13.0.1           |Low       |Linux kernel   |
|               |               |12.1.3           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IP Edge    |11.2.1         |None             |Low       |Linux kernel   |
|Gateway        |               |                 |          |               |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IP GTM     |11.4.0 - 11.6.1|11.6.2           |Low       |Linux kernel   |
|               |11.2.1         |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |13.0.0 - 13.1.0|13.1.0.4         |          |               |
|BIG-IP Link    |12.0.0 - 12.1.2|13.0.1           |          |               |
|Controller     |11.4.0 - 11.6.1|12.1.3           |Low       |Linux kernel   |
|               |11.2.1         |11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |               |13.1.0.4         |          |               |
|               |13.0.0 - 13.1.0|13.0.1           |          |               |
|BIG-IP PEM     |12.0.0 - 12.1.2|12.1.3           |Low       |Linux kernel   |
|               |11.4.0 - 11.6.1|11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IP PSM     |11.4.0 - 11.4.1|None             |Low       |Linux kernel   |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IP         |11.2.1         |None             |Low       |Linux kernel   |
|WebAccelerator |               |                 |          |               |
+---------------+---------------+-----------------+----------+---------------+
|               |               |13.1.0.4         |          |               |
|               |13.0.0 - 13.1.0|13.0.1           |Low       |               |
|BIG-IP WebSafe |12.0.0 - 12.1.2|12.1.3           |          |Linux kernel   |
|               |11.6.0 - 11.6.1|11.6.2           |          |               |
|               |               |11.5.5           |          |               |
+---------------+---------------+-----------------+----------+---------------+
|ARX            |None           |6.2.0 - 6.4.0    |Not       |None           |
|               |               |                 |vulnerable|               |
+---------------+---------------+-----------------+----------+---------------+
|Enterprise     |3.1.1          |None             |Low       |Linux kernel   |
|Manager        |               |                 |          |               |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IQ Cloud   |4.0.0 - 4.5.0  |None             |Low       |Linux kernel   |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IQ Device  |4.2.0 - 4.5.0  |None             |Low       |Linux kernel   |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IQ Security|4.0.0 - 4.5.0  |None             |Low       |Linux kernel   |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IQ ADC     |4.5.0          |None             |Low       |Linux kernel   |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IQ         |5.0.0 - 5.4.0  |                 |          |               |
|Centralized    |4.6.0          |None             |Low       |Linux kernel   |
|Management     |               |                 |          |               |
+---------------+---------------+-----------------+----------+---------------+
|BIG-IQ Cloud   |               |                 |          |               |
|and            |1.0.0          |None             |Low       |Linux kernel   |
|Orchestration  |               |                 |          |               |
+---------------+---------------+-----------------+----------+---------------+
|F5 iWorkflow   |2.0.0 - 2.3.0  |None             |Low       |Linux kernel   |
+---------------+---------------+-----------------+----------+---------------+
|LineRate       |None           |3.0.0 - 3.1.1    |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.

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

None


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 K9502: BIG-IP hotfix and point release matrix

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