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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0635
                     cURL vulnerability CVE-2020-8286
                             19 February 2021

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

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

Product:           BIG-IP
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-8286  

Reference:         ESB-2020.4506
                   ESB-2020.4364

Original Bulletin: 
   https://support.f5.com/csp/article/K15402727

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K15402727: cURL vulnerability CVE-2020-8286

Original Publication Date: 19 Feb, 2021

Security Advisory Description

curl 7.41.0 through 7.73.0 is vulnerable to an improper check for certificate
revocation due to insufficient verification of the OCSP response. (
CVE-2020-8286)

Impact

An attacker could provide a forged OCSP response to the F5 product that has
made the request with curl, and this fake response could make it appear that a
TLS certificate is valid when it may have actually been revoked.

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

Security Advisory Status

F5 Product Development has assigned ID 981917 (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    |          |          |      |curl/      |
|BIG-IP (LTM, AAM, +------+----------+----------+          |      |libcurl    |
|Advanced WAF, AFM,|14.x  |14.1.0 -  |None      |          |      |(Command   |
|Analytics, APM,   |      |14.1.3    |          |          |      |Line       |
|ASM, DDHD, DNS,   +------+----------+----------+High      |7.4   |Interface, |
|FPS, GTM, Link    |13.x  |13.1.0 -  |None      |          |      |EAV        |
|Controller, PEM,  |      |13.1.3    |          |          |      |Monitors,  |
|SSLO)             +------+----------+----------+          |      |iRules)    |
|                  |12.x  |None      |Not       |          |      |           |
|                  |      |          |applicable|          |      |           |
|                  +------+----------+----------+          |      |           |
|                  |11.x  |None      |Not       |          |      |           |
|                  |      |          |applicable|          |      |           |
+------------------+------+----------+----------+----------+------+-----------+
|                  |7.x   |None      |Not       |          |      |           |
|BIG-IQ Centralized|      |          |applicable|Not       |      |           |
|Management        +------+----------+----------+vulnerable|None  |None       |
|                  |6.x   |None      |Not       |          |      |           |
|                  |      |          |applicable|          |      |           |
+------------------+------+----------+----------+----------+------+-----------+
|F5OS              |1.x   |**        |**        |**        |**    |**         |
+------------------+------+----------+----------+----------+------+-----------+
|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.

**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 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

  o Restrict the Management Interface access to only trusted users. For more
    information regarding the BIG-IP system, refer to the following article:
    K13092: Overview of securing access to the BIG-IP system.
  o Connect to only trusted OCSP responders.
  o If feasible, remove EAV monitors or iRules that use curl to access OCSP
    responders.

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 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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