ESB-2019.0346 - [Appliance] F5 products: Modify arbitrary files - Remote with user interaction - 2019-02-06


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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0346
            A vulnerability has been identified in F5 products
                              6 February 2019

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

Product:           F5 products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Modify Arbitrary Files         -- Remote with User Interaction
                   Provide Misleading Information -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6110  

Reference:         ESB-2019.0164.2

Original Bulletin: 
   https://support.f5.com/csp/article/K42531048

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K42531048: OpenSSH vulnerability CVE-2019-6110

Security Advisory

Original Publication Date: Jan 18, 2019
Updated Date: Feb 06, 2019

Applies to (see versions):

  o Product: BIG-IQ, BIG-IQ Centralized Management
      - 6.1.0, 6.0.1, 6.0.0, 5.4.0, 5.3.0, 5.2.0, 5.1.0, 5.0.0
  o Product: BIG-IP, BIG-IP AAM, BIG-IP AFM, BIG-IP Analytics, BIG-IP APM,
    BIG-IP ASM, BIG-IP DNS, BIG-IP Edge Gateway, BIG-IP FPS, BIG-IP GTM, BIG-IP
    Link Controller, BIG-IP LTM, BIG-IP PEM, BIG-IP WebAccelerator
      - 14.1.0, 14.0.0, 13.1.1, 13.1.0, 13.0.1, 13.0.0, 12.1.4, 12.1.3, 12.1.2,
        12.1.1, 12.1.0, 11.6.3, 11.6.2, 11.6.1, 11.5.8, 11.5.7, 11.5.6, 11.5.5,
        11.5.4, 11.5.3, 11.5.2, 11.5.1
  o Product: Enterprise Manager
      - 3.1.1
  o Product: F5 iWorkflow
      - 2.3.0
  o Product: Traffix SDC
      - 5.1.0, 5.0.0, 4.4.0

Security Advisory Description

In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from
the server, a malicious server (or Man-in-The-Middle attacker) can manipulate
the client output, for example to use ANSI control codes to hide additional
files being transferred. (CVE-2019-6110)

Impact

Acceptance and display of arbitrary stderr allows for spoofing of OpenSSH SCP
client output.

For products with None in the Versions known to be vulnerable column, there is
no impact.

For products with ** in the various columns, F5 is still researching the issue
and will update this article after confirming the required information. F5
Technical Support has no additional information about this issue.

Security Advisory Status

F5 Product Development has assigned ID 757604 (BIG-IP), ID 757604-8 (BIG-IQ),
CPF-25054 and CPF-25055 (Traffix) 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  |14.0.0 -  |None      |        |      |          |
|                     |      |14.1.0    |          |        |      |          |
|BIG-IP (LTM, AAM,    +------+----------+----------+        |      |          |
|AFM, Analytics, APM, |13.x  |13.0.0 -  |None      |        |      |          |
|ASM, DNS, Edge       |      |13.1.1    |          |        |      |OpenSSH   |
|Gateway, FPS,        +------+----------+----------+Low     |3.1   |(SCP      |
|GTM, Link Controller,|12.x  |12.1.0 -  |None      |        |      |client)   |
|PEM, WebAccelerator) |      |12.1.4    |          |        |      |          |
|                     +------+----------+----------+        |      |          |
|                     |11.x  |11.5.1 -  |None      |        |      |          |
|                     |      |11.6.3    |          |        |      |          |
+---------------------+------+----------+----------+--------+------+----------+
|Enterprise Manager   |3.x   |**        |**        |**      |**    |**        |
+---------------------+------+----------+----------+--------+------+----------+
|                     |6.x   |6.0.0 -   |None      |        |      |          |
|BIG-IQ Centralized   |      |6.1.0     |          |        |      |OpenSSH   |
|Management           +------+----------+----------+Low     |3.1   |(SCP      |
|                     |5.x   |5.0.0 -   |None      |        |      |client)   |
|                     |      |5.4.0     |          |        |      |          |
+---------------------+------+----------+----------+--------+------+----------+
|F5 iWorkflow         |2.x   |**        |**        |**      |**    |**        |
+---------------------+------+----------+----------+--------+------+----------+
|                     |5.x   |5.0.0 -   |          |        |      |OpenSSH   |
|Traffix SDC          |      |5.1.0     |          |Low     |3.1   |(SCP      |
|                     +------+----------+----------+        |      |client)   |
|                     |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.

**Confirmation of vulnerability or non-vulnerability is not presently
available. F5 is still researching the issue for the products indicated and
will update this article with the most current information as soon as it has
been confirmed. F5 Technical Support has no additional information on this
issue.

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

There is no mitigation for a man-in-the-middle attack.

You can mitigate the vulnerability from a malicious server by verifying the
host key fingerprint when connecting to systems with the SCP client.

Supplemental Information

  o K51812227: Understanding Security Advisory versioning
  o K41942608: Overview of AskF5 Security Advisory articles
  o K4602: Overview of the F5 security vulnerability response policy
  o K4918: Overview of the F5 critical issue hotfix policy
  o K9970: Subscribing to email notifications regarding F5 products
  o K9957: Creating a custom RSS feed to view new and updated documents
  o K31781390: January 2019 OpenSSH security vulnerabilities

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