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             AUSCERT External Security Bulletin Redistribution

                              ESB-2020.3515.2
                OpenSSH client vulnerability CVE-2020-14145
                              6 January 2021

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

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

Product:           BIG-IP
Publisher:         F5 Networks
Operating System:  Network Appliance
                   UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
                   Read-only Data Access          -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2020-14145  

Original Bulletin: 
   https://support.f5.com/csp/article/K48050136

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than F5 Networks. It is recommended that 
         administrators running BIG-IP check for an updated version of the 
         software for their operating system.

Revision History:  January  6 2021: Additional vulnerable versions added by vendor
                   October 14 2020: Initial Release

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

K48050136: OpenSSH client vulnerability CVE-2020-14145

Original Publication Date: 14 Oct, 2020
Latest   Publication Date: 06 Jan, 2021

Security Advisory Description

The client side in OpenSSH 5.7 through 8.3 has an Observable Discrepancy
leading to an information leak in the algorithm negotiation. This allows
man-in-the-middle attackers to target initial connection attempts (where no
host key for the server has been cached by the client). (CVE-2020-14145)

Impact

SSH sessions may be vulnerable to a man-in-the-middle attack.

Security Advisory Status

F5 Product Development has assigned ID 950605 (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|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |16.x  |16.0.0 -  |None      |          |      |          |
|                   |      |16.0.1    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |15.x  |15.1.0 -  |None      |          |      |          |
|                   |      |15.1.2    |          |          |      |          |
|BIG-IP (LTM, AAM,  +------+----------+----------+          |      |          |
|Advanced WAF, AFM, |14.x  |14.1.0 -  |None      |          |      |          |
|Analytics, APM,    |      |14.1.3    |          |          |      |OpenSSH   |
|ASM, DDHD, DNS,    +------+----------+----------+Medium    |5.3   |Client    |
|FPS, GTM, Link     |13.x  |13.1.0 -  |None      |          |      |          |
|Controller, PEM,   |      |13.1.3    |          |          |      |          |
|SSLO)              +------+----------+----------+          |      |          |
|                   |12.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |7.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IQ Centralized |6.x   |None      |Not       |Not       |None  |None      |
|Management         |      |          |applicable|vulnerable|      |          |
|                   +------+----------+----------+          |      |          |
|                   |5.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|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

Connect only to SSH servers with known and trusted host keys.

Supplemental Information

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 - 16.x)
  o K15106: Managing BIG-IQ product hotfixes
  o K15113: BIG-IQ hotfix and point release matrix
  o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
    systems (11.4.x and later)
  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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