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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.4744
  ASM Cloud Security Services authentication vulnerability CVE-2019-6687
                             20 December 2019

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

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

Product:           BIG-IP ASM
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
                   Reduced Security               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6687  

Original Bulletin: 
   https://support.f5.com/csp/article/K59957337

- --------------------------BEGIN INCLUDED TEXT--------------------

K59957337:ASM Cloud Security Services authentication vulnerability CVE-2019-6687

Security Advisory

Original Publication Date: 20 Dec, 2019

Security Advisory Description

The BIG-IP ASM Cloud Security Services profile uses a built-in verification
mechanism that fails to properly authenticate the X.509 certificate of remote
endpoints. (CVE-2019-6687)

Impact

This vulnerability may allow man-in-the-middle attackers to intercept traffic
destined for cloud services, and read and modify data that is in transit.

Security Advisory Status

F5 Product Development has assigned ID 825597 (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, point 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  |15.0.1    |15.1.0    |           |      |          |
|                  +------+----------+----------+           |      |          |
|                  |14.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
|                  +------+----------+----------+           |      |Cloud     |
|                  |13.x  |None      |Not       |           |      |Security  |
|BIG-IP (ASM)      |      |          |applicable|Medium     |5.9   |Services  |
|                  +------+----------+----------+           |      |profile   |
|                  |12.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
|                  +------+----------+----------+           |      |          |
|                  |11.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|                  |15.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
|                  +------+----------+----------+           |      |          |
|                  |14.x  |None      |Not       |           |      |          |
|BIG-IP (LTM, AAM, |      |          |applicable|           |      |          |
|AFM, Analytics,   +------+----------+----------+Not        |      |          |
|APM, DNS, FPS,    |13.x  |None      |Not       |vulnerable^|None  |None      |
|GTM, Link         |      |          |applicable|2          |      |          |
|Controller, PEM)  +------+----------+----------+           |      |          |
|                  |12.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
|                  +------+----------+----------+           |      |          |
|                  |11.x  |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|Enterprise Manager|3.x   |None      |Not       |Not        |None  |None      |
|                  |      |          |applicable|vulnerable |      |          |
+------------------+------+----------+----------+-----------+------+----------+
|                  |7.x   |None      |Not       |           |      |          |
|                  |      |          |applicable|           |      |          |
|                  +------+----------+----------+           |      |          |
|BIG-IQ Centralized|6.x   |None      |Not       |Not        |None  |None      |
|Management        |      |          |applicable|vulnerable |      |          |
|                  +------+----------+----------+           |      |          |
|                  |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.

^2The specified products contain the affected code. However, F5 identifies the
vulnerability status as Not vulnerable because the attacker cannot exploit the
code in default, standard, or recommended configurations.

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 create a new serverssl SSL profile to
perform server certificate authentication, and then associate the profile with
the virtual server. To do so, perform the following procedure:

Impact of action: Performing the following procedure should not have a negative
impact on your system.

Creating a serverssl profile to perform server certificate authentication

 1. Log into the Configuration utility.
 2. Go to Local Traffic > Profiles > SSL > Server.
 3. Select Create.
 4. In Name, enter a name for the SSL profile.
 5. For Server Authentication, select the Custom check box.
 6. In the Server Certificate list, select require.
 7. In the Frequency list, select always.
 8. In the Trusted Certificate Authorities list, select ca-bundle.crt.
 9. Click Finished.

You must now associate the new serverssl profile with the virtual server that
references the Cloud Security Services profile.

Supplemental Information

o K51812227: Understanding Security Advisory versioning
  o K41942608: Overview of Security Advisory articles
  o K4602: Overview of the F5 security vulnerability response policy
  o K4918: Overview of the F5 critical issue hotfix policy
  o K9502: BIG-IP hotfix and point release matrix
  o K13123: Managing BIG-IP product hotfixes (11.x - 15.x)
  o K167: Downloading software and firmware from F5
  o K9970: Subscribing to email notifications regarding F5 products
  o K9957: Creating a custom RSS feed to view new and updated documents

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