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             AUSCERT External Security Bulletin Redistribution

                              ESB-2020.2918.2
               BIG-IP Server SSL vulnerability CVE-2020-5913
                             17 September 2020

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

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

Product:           BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Provide Misleading Information -- Remote with User Interaction
                   Access Confidential Data       -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-5913  

Original Bulletin: 
   https://support.f5.com/csp/article/K72752002

Revision History:  September 17 2020: Vendor updated vulnerable component or features
                   August    26 2020: Initial Release

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K72752002:BIG-IP SSL/TLS CRL vulnerability CVE-2020-5913

Security Advisory

Original Publication Date: 26 Aug, 2020

Latest   Publication Date: 17 Sep, 2020

Security Advisory Description

The BIG-IP Client or Server SSL profile ignores revoked certificates, even when
a valid CRL is present. This impacts SSL/TLS connections and may result in a
man-in-the-middle attack on the connections. (CVE-2020-5913)

Impact

The BIG-IP system does not enforce Transport Layer Security (TLS) certificate
chain restrictions as expected. As a result, SSL/TLS connections may experience
man-in-the-middle attacks. This vulnerability affects connections that use a
BIG-IP Client or Server SSL profile enabled with Certificate Revocation List
(CRL) and a valid revoked intermediate certificate.

Security Advisory Status

F5 Product Development has assigned ID 879025 (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  |               |          |CVSSv3|Vulnerable|
|Product       |Branch|known to  |Fixes          |Severity  |score^|component |
|              |      |be        |introduced in  |          |1     |or feature|
|              |      |vulnerable|               |          |      |          |
+--------------+------+----------+---------------+----------+------+----------+
|              |16.x  |None      |16.0.0         |          |      |          |
|              +------+----------+---------------+          |      |          |
|              |15.x  |15.0.0 -  |15.1.0.2       |          |      |          |
|              |      |15.1.0    |               |          |      |          |
|BIG-IP (LTM,  +------+----------+---------------+          |      |          |
|AAM, Advanced |      |14.1.0 -  |14.1.2.5       |          |      |          |
|WAF, AFM,     |14.x  |14.1.2    |14.1.2-0.89.37^|          |      |BIG-IP    |
|Analytics,    |      |          |2              |          |      |Client or |
|APM, ASM,     +------+----------+---------------+High      |7.4   |Server SSL|
|DDHD, DNS,    |13.x  |13.1.0 -  |None           |          |      |profile   |
|FPS, GTM, Link|      |13.1.3    |               |          |      |          |
|Controller,   +------+----------+---------------+          |      |          |
|PEM, SSLO)    |12.x  |12.1.0 -  |12.1.5.2       |          |      |          |
|              |      |12.1.5    |               |          |      |          |
|              +------+----------+---------------+          |      |          |
|              |11.x  |11.6.1 -  |None           |          |      |          |
|              |      |11.6.5    |               |          |      |          |
+--------------+------+----------+---------------+----------+------+----------+
|              |7.x   |None      |Not applicable |          |      |          |
|BIG-IQ        +------+----------+---------------+Not       |      |          |
|Centralized   |6.x   |None      |Not applicable |vulnerable|None  |None      |
|Management    +------+----------+---------------+          |      |          |
|              |5.x   |None      |Not applicable |          |      |          |
+--------------+------+----------+---------------+----------+------+----------+
|Traffix SDC   |5.x   |None      |Not applicable |Not       |None  |None      |
|              |      |          |               |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.

^2An Engineering Hotfix was released for virtual images of BIG-IP 14.1.2
(BIGIP-14.1.2-0.89.37) on various platforms and the public cloud marketplace to
fix this vulnerability.

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

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 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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