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             AUSCERT External Security Bulletin Redistribution

                F5 secure shell vulnerability CVE-2020-5873
                               16 April 2021


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP Products
                   F5 BIG-IQ Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-5873  

Original Bulletin: 

Revision History:  April 16 2021: Vendor released fixes for BIG-IQ Centralized Management.
                   May   14 2020: Vendor released minor update
                   May    1 2020: Initial Release

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K03585731: F5 secure shell vulnerability CVE-2020-5873

Original Publication Date: 30 Apr, 2020
Latest   Publication Date: 16 Apr, 2021

Security Advisory Description

A user associated with the Resource Administrator role who has access to the
secure copy (scp) utility but does not have access to Advanced Shell (bash) can
execute arbitrary commands using a maliciously crafted scp request. (


An authenticated user with Resource Administrator role can run shell commands
with elevated privilege.

Security Advisory Status

F5 Product Development has assigned ID 780601 (BIG-IP), and ID 790469 (BIG-IQ)
 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|          |          |      |          |
|                   |15.x  |15.0.0 -  |15.1.0    |          |      |          |
|                   |      |15.0.1    |  |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |14.x  |14.1.0 -  |^2|          |      |          |
|BIG-IP (LTM, AAM,  |      |14.1.2    |          |          |      |          |
|AFM, Analytics,    +------+----------+----------+          |      |          |
|APM, ASM, DNS, FPS,|13.x  |13.1.0 -  |  |High      |7.8   |SSH       |
|GTM, Link          |      |13.1.3    |          |          |      |          |
|Controller, PEM)   +------+----------+----------+          |      |          |
|                   |12.x  |12.1.0 -  |  |          |      |          |
|                   |      |12.1.5    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |11.6.1 -  |  |          |      |          |
|                   |      |11.6.5    |          |          |      |          |
|                   |8.x   |None      |8.0.0     |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |7.x   |7.0.0 -   |None      |          |      |          |
|                   |      |7.1.0     |          |          |      |          |
|BIG-IQ Centralized +------+----------+----------+High      |7.8   |SSH       |
|Management         |6.x   |6.0.0 -   |None      |          |      |          |
|                   |      |6.1.0     |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |5.x   |5.3.0 -   |None      |          |      |          |
|                   |      |5.4.0     |          |          |      |          |
|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.

^2BIG-IP is not a supported release; please use a later release. Refer
to K5903: BIG-IP software support policy.

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.


To mitigate this vulnerability, you can limit access to the management and self
IP ports and limit login access to trusted users. For more information about
securing access to the affected systems:

  o For BIG-IP or Enterprise Manager systems, refer to K13309: Restricting
    access to the Configuration utility by source IP address (11.x - 15.x) and 
    K13092: Overview of securing access to the BIG-IP system. 
  o For BIG-IQ systems, refer to K31401771: Restricting access to the BIG-IQ or
    F5 iWorkflow user interface by source IP address. For BIG-IQ systems, you
    may need to include addresses of the managed BIG-IP systems, high
    availability (HA) peers, and DCD nodes, depending on your configuration.

Supplemental Information

o K51812227: Understanding Security Advisory versioning
  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 - 15.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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