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             AUSCERT External Security Bulletin Redistribution

           TACACS+ audit forwarding uses an unencrypted database
                        variable to store passwords
                             18 December 2020


        AusCERT Security Bulletin Summary

Product:           TACACS+
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade

Original Bulletin: 

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K21404407: TACACS+ audit forwarding uses an unencrypted database variable to
store passwords

Original Publication Date: 17 Dec, 2020

Security Advisory Description

The audit forwarding mechanism for Terminal Access Controller Access-Control
System Plus (TACACS+) uses an unencrypted database variable to store passwords.


This issue occurs when all the following conditions are met:

  o You configure TACACS+ to enable audit forwarding. 

For more information on TACACS+ audit forwarding, refer to K13762: Configuring
remote RADIUS or TACACS+ accounting.


This issue occurs when all the following conditions are met:

  o You configure TACACS+ to enable audit forwarding.
  o In the BIG-IQ system, you can configure TACACS+ authentication for log in
    to the Configuration utility or the command line. This vulnerability only
    affects the command line.


The system leaks sensitive information to authenticated users who have access
to the BIG-IP system.


As a result of this issue, you may encounter one or more of the following

  o The TACACS shared key in the database variable is not encrypted and is
    visible to administrators or read-only users.

Security Advisory Status

F5 Product Development has assigned ID 706521 (BIG-IP) and ID 706521-8 (BIG-IQ)
to this issue. F5 has confirmed that this issue exists in the products listed
in the Applies to (see versions) box, located in the upper-right corner of this
article. For information about releases, point releases, or hotfixes that
resolve this issue, refer to the following table.

|Type of fix       |Fixes introduced |Related articles                        |
|                  |in               |                                        |
|Release           |16.0.1           |K2200: Most recent versions of F5       |
|                  |15.1.1           |software                                |
|Point release/    |         |K9502: BIG-IP hotfix and point release  |
|hotfix            |         |matrix                                  |

Security Advisory Recommended Actions



Supplemental Information

o K51812227: Understanding security advisory versioning
  o K41942608: Overview of AskF5 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 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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