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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.2928
            F5 products affected by Linux kernel vulnerability
                               6 August 2019

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

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

Product:           F5 products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12190  

Reference:         ESB-2018.1301
                   ESB-2018.0528.2
                   ESB-2017.2980

Original Bulletin: 
   https://support.f5.com/csp/article/K93472064

Comment: This vulnerability was originally announced by F5 for their products
         more than a year ago, but F5 have just announced that fixes for
         BIG-IP products have become available in version 14 so we are
         publishing it now.

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K93472064:Linux kernel vulnerability CVE-2017-12190

Security Advisory

Original Publication Date: 20 Jul, 2018

Latest   Publication Date: 06 Aug, 2019

Security Advisory Description

The bio_map_user_iov and bio_unmap_user functions in block/bio.c in the Linux
kernel before 4.13.8 do unbalanced refcounting when a SCSI I/O vector has small
consecutive buffers belonging to the same page. The bio_add_pc_page function
merges them into one, but the page reference is never dropped. This causes a
memory leak and possible system lockup (exploitable against the host OS by a
guest OS user, if a SCSI disk is passed through to a virtual machine) due to an
out-of-memory condition. (CVE-2017-12190)

Impact

A locally authenticated attacker can exploit this vulnerability to trigger an
out-of-memory condition to cause a denial of service (DoS) on the affected
system.

Security Advisory Status

F5 Product Development has assigned IDs 734177 and 734181 (BIG-IP), ID 734624
(BIG-IQ and iWorkflow), ID 734257 (Enterprise Manager), and ID CPF-24941
and CPF-24942 (Traffix SDC) 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        |          |1     |or feature|
|                   |      |vulnerable|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |14.x  |None      |14.0.0    |          |      |          |
|BIG-IP (LTM, AAM,  +------+----------+----------+          |      |          |
|AFM, Analytics,    |13.x  |13.0.0 -  |None      |          |      |          |
|APM, ASM, DNS, Edge|      |13.1.1    |          |          |      |TMOS      |
|Gateway, FPS, GTM, +------+----------+----------+Medium    |6.2   |(Linux    |
|Link Controller,   |12.x  |12.1.0 -  |None      |          |      |kernel)   |
|PEM,               |      |12.1.4    |          |          |      |          |
|WebAccelerator)    +------+----------+----------+          |      |          |
|                   |11.x  |11.2.1 -  |None      |          |      |          |
|                   |      |11.6.4    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|ARX                |6.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |      |          |Not       |          |      |TMOS      |
|Enterprise Manager |3.x   |3.1.1     |applicable|Medium    |6.2   |(Linux    |
|                   |      |          |          |          |      |kernel)   |
+-------------------+------+----------+----------+----------+------+----------+
|                   |6.x   |6.0.0 -   |None      |          |      |          |
|                   |      |6.1.0     |          |          |      |          |
|BIG-IQ Centralized +------+----------+----------+          |      |TMOS      |
|Management         |5.x   |5.0.0 -   |None      |Medium    |6.2   |(Linux    |
|                   |      |5.4.0     |          |          |      |kernel)   |
|                   +------+----------+----------+          |      |          |
|                   |4.x   |4.6.0     |None      |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|BIG-IQ Cloud and   |      |          |          |          |      |TMOS      |
|Orchestration      |1.x   |1.0.0     |None      |Medium    |6.2   |(Linux    |
|                   |      |          |          |          |      |kernel)   |
+-------------------+------+----------+----------+----------+------+----------+
|                   |      |2.1.0 -   |          |          |      |TMOS      |
|F5 iWorkflow       |2.x   |2.3.0     |None      |Medium    |6.2   |(Linux    |
|                   |      |          |          |          |      |kernel)   |
+-------------------+------+----------+----------+----------+------+----------+
|                   |5.x   |5.0.0 -   |None      |          |      |TMOS      |
|Traffix SDC        |      |5.1.0     |          |Medium    |6.2   |(Linux    |
|                   +------+----------+----------+          |      |kernel)   |
|                   |4.x   |4.4.0     |None      |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+

^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.

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

None

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