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             AUSCERT External Security Bulletin Redistribution

                              ESB-2019.2413.2
                     BIND vulnerability CVE-2018-5743
                              12 August 2019

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

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

Product:           F5 BIG-IP Products
                   F5 Enterprise Manager
                   F5 BIG-IQ Centralized Management
                   F5 iWorkflow
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5743  

Reference:         ESB-2019.2164
                   ESB-2019.2152
                   ESB-2019.2082
                   ESB-2019.2052

Original Bulletin: 
   https://support.f5.com/csp/article/K74009656

Revision History:  August 12 2019: Vendor added some affected and patched versions
                   July    3 2019: Initial Release

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K74009656:BIND vulnerability CVE-2018-5743

Security Advisory

Original Publication Date: 25 Apr, 2019

Latest   Publication Date: 10 Aug, 2019

Security Advisory Description

** RESERVED ** This candidate has been reserved by an organization or
individual that will use it when announcing a new security problem. When the
candidate has been publicized, the details for this candidate will be provided.
(CVE-2018-5743)

By design, BIND is intended to limit the number of TCP clients that can be
connected at any given time. The number of allowed connections is a tunable
parameter which, if unset, defaults to a conservative value for most servers.
Unfortunately, the code which was intended to limit the number of simultaneous
connections contains an error which can be exploited to grow the number of
simultaneous connections beyond this limit.

Impact

BIG-IP / BIG-IQ / Enterprise Manager / F5 iWorkflow

An attacker may exhaust file descriptors available to the named process; as a
result, network connections and the management of log files or zone journal
files may be affected. In BIG-IQ / Enterprise Manager / F5 iWorkflow standard
and default configurations, exposure is limited to localhost, and there is no
remote exposure.

Traffix SDC

There is no impact; this F5 product is not affected by this vulnerability.

Security Advisory Status

F5 Product Development has assigned ID 757023 (BIG-IP), ID 758914 (BIG-IQ), and
ID 758915 (F5 iWorkflow) to this vulnerability. Additionally, F5 iHealth may
list Heuristic H74009656 on the Diagnostics > Identified > High page.

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|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |15.x  |15.0.0    |None      |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |14.x  |14.0.0 -  |14.1.0.6  |          |      |          |
|BIG-IP (LTM, AAM,  |      |14.1.0    |14.0.0.5  |          |      |          |
|AFM, Analytics,    +------+----------+----------+          |      |          |
|APM, ASM, DNS, Edge|13.x  |13.0.0 -  |13.1.3    |          |      |          |
|Gateway, FPS, GTM, |      |13.1.1    |          |High      |7.5   |named     |
|Link Controller,   +------+----------+----------+          |      |          |
|PEM,               |12.x  |12.1.0 -  |12.1.5    |          |      |          |
|WebAccelerator)    |      |12.1.4    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |11.5.2 -  |None      |          |      |          |
|                   |      |11.6.4    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x   |3.1.1     |None      |Low       |2.5   |named     |
+-------------------+------+----------+----------+----------+------+----------+
|                   |6.x   |6.0.0 -   |None      |          |      |          |
|BIG-IQ Centralized |      |6.1.0     |          |          |      |          |
|Management         +------+----------+----------+Low       |2.5   |named     |
|                   |5.x   |5.0.0 -   |None      |          |      |          |
|                   |      |5.4.0     |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow       |2.x   |2.3.0     |None      |Low       |2.5   |named     |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC        |5.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+

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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