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             AUSCERT External Security Bulletin Redistribution

                     cURL vulnerability CVE-2020-8284
                             14 September 2021


        AusCERT Security Bulletin Summary

Product:           BIG-IP
                   Traffix SDC
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-8284  

Reference:         ESB-2020.4506

Original Bulletin: 

Revision History:  September 14 2021: Vendor updated versions known to be vulnerable
                   February  19 2021: Initial Release

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K63525058: cURL vulnerability CVE-2020-8284

Original Publication Date: 19 Feb, 2021
Latest   Publication Date: 13 Sep, 2021

Security Advisory Description

A malicious server can use the FTP PASV response to trick curl 7.73.0 and
earlier into connecting back to a given IP address and port, and this way
potentially make curl extract information about services that are otherwise
private and not disclosed, for example doing port scanning and service banner
extractions. (CVE-2020-8284)


If curl is used from the F5 product and it connects to a malicious FTP server,
an attacker can manipulate curl to access restricted information.

Security Advisory Status

F5 Product Development has assigned ID 978441 (BIG-IP) ID 978441-6 (BIG-IQ), ID
999345 (F5OS), and CPF-25231 (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, 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 or|
|                   |      |be        |in        |        |1     |feature     |
|                   |      |vulnerable|          |        |      |            |
|                   |16.x  |16.0.0 -  |None      |        |      |            |
|                   |      |16.0.1    |          |        |      |            |
|                   +------+----------+----------+        |      |            |
|                   |15.x  |15.1.0 -  |None      |        |      |            |
|                   |      |15.1.2    |          |        |      |            |
|BIG-IP (LTM, AAM,  +------+----------+----------+        |      |curl/libcurl|
|Advanced WAF, AFM, |14.x  |14.1.0 -  |None      |        |      |(Command    |
|Analytics, APM,    |      |14.1.3    |          |        |      |Line        |
|ASM, DDHD, DNS,    +------+----------+----------+Low     |3.1   |Interface,  |
|FPS, GTM, Link     |13.x  |None      |Not       |        |      |EAV         |
|Controller, PEM,   |      |          |applicable|        |      |Monitors,   |
|SSLO)              +------+----------+----------+        |      |iRules)     |
|                   |12.x  |None      |Not       |        |      |            |
|                   |      |          |applicable|        |      |            |
|                   +------+----------+----------+        |      |            |
|                   |11.x  |None      |Not       |        |      |            |
|                   |      |          |applicable|        |      |            |
|                   |8.x   |8.0.0     |None      |        |      |            |
|                   +------+----------+----------+        |      |curl/libcurl|
|BIG-IQ Centralized |7.x   |None      |Not       |        |      |(Command    |
|Management         |      |          |applicable|Low     |3.1   |Line        |
|                   +------+----------+----------+        |      |Interface)  |
|                   |6.x   |None      |Not       |        |      |            |
|                   |      |          |applicable|        |      |            |
|                   |      |          |          |        |      |curl/libcurl|
|                   |      |1.0.0 -   |          |        |      |(Command    |
|F5OS               |1.x   |1.1.4     |None      |Low     |3.1   |Line        |
|                   |      |          |          |        |      |Interface,  |
|                   |      |          |          |        |      |confd)      |
|Traffix SDC        |5.x   |5.1.0     |None      |Low     |3.1   |curl/libcurl|

^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.

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.


  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 FTP servers.
  o Use the following curl command line option:


    This option causes curl to ignore the IP address that the server suggests
    for the data connection. Instead, curl uses the same IP address it is using
    for the control connection.

    For example:

    curl --ftp-skip-pasv-ip -k -u user -o /shared/tmp

    Note: This could cause problems in situations where you expect the
    server to need the client to connect back to an IP address other than the
    control connection IP address.

  o If feasible, use the --ftp-skip-pasv-ip mitigation with the EAV monitors or
    iRules that use curl to access the FTP servers, or just remove the EAV
    monitors or iRules.

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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