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

                               ESB-2019.3050
              BIG-IP FTP profile vulnerability CVE-2019-6645
                              12 August 2019

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

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

Product:           F5 BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6645  

Original Bulletin: 
   https://support.f5.com/csp/article/K15759349

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K15759349:BIG-IP FTP profile vulnerability CVE-2019-6645

Security Advisory

Original Publication Date: 09 Aug, 2019

Security Advisory Description

FTP traffic passing through a virtual server with both an active FTP profile
associated and connection mirroring configured may cause the Traffic Management
Microkernel (TMM) to stop responding, causing the configured high availability
(HA) action to be taken. (CVE-2019-6645)

Impact

This vulnerability allows remote attackers to cause a denial-of-service (DoS)
on the BIG-IP system.

Security Advisory Status

F5 Product Development has assigned ID 756538 (BIG-IP) 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|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |15.x  |None      |15.0.0    |          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IP (LTM, AAM,  |      |14.1.0    |14.1.0.6  |          |      |          |
|AFM, Analytics,    |14.x  +----------+----------+          |      |          |
|APM, ASM, DNS, Edge|      |14.0.0    |None      |          |      |          |
|Gateway, FPS, GTM, +------+----------+----------+          |      |          |
|Link Controller,   |13.x  |13.1.0 -  |13.1.3    |High      |7.5   |FTP       |
|PEM,               |      |13.1.1    |          |          |      |Profile   |
|WebAccelerator)    +------+----------+----------+          |      |          |
|                   |12.x  |12.1.0 -  |12.1.5    |          |      |          |
|                   |      |12.1.4    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |11.5.2 -  |None      |          |      |          |
|                   |      |11.6.4    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |6.x   |None      |Not       |          |      |          |
|BIG-IQ Centralized |      |          |applicable|Not       |      |          |
|Management         +------+----------+----------+vulnerable|None  |None      |
|                   |5.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow       |2.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC        |5.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+

^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

To mitigate this vulnerability, you can disable connection mirroring for FTP
virtual servers, or use passive FTP.  To do so, perform the following
procedure:

Disabling connection mirroring

Impact of action: Disabling connection mirroring may disrupt in-flight FTP
connections in the event of a failover.

 1. From the BIG-IP configuration utility, navigate to Local Traffic > Virtual
    Servers > Virtual Servers List.
 2. Select your FTP virtual server.
 3. Set the Configuration mode to Advanced.
 4. Clear the Connection mirroring option.
 5. To save the changes, click Update.

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