Operating System:

[Win]

Published:

11 February 2021

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0507
                BIG-IP APM CTU vulnerability CVE-2021-22980
                             11 February 2021

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

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

Product:           APM Clients
                   BIG-IP (APM)
Publisher:         F5 Networks
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Provide Misleading Information  -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-22980  

Original Bulletin: 
   https://support.f5.com/csp/article/K29282483

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K29282483: BIG-IP APM CTU vulnerability CVE-2021-22980

Original Publication Date: 11 Feb, 2021

Security Advisory Description

An untrusted search path vulnerability in the BIG-IP APM Client Troubleshooting
Utility (CTU) for Windows can allow an attacker to load a malicious DLL library
from its current directory. User interaction is required to exploit this
vulnerability because the victim must run this utility on the Windows system. (
CVE-2021-22980)

Impact

For some diagnostic functions, you must run the CTU as a privileged user. The
CTU prompts the user to escalate privileges for those functions. This
vulnerability can allow attackers to trick a victim into loading an arbitrary
DLL as a privileged user on the vulnerable Windows system.

For more information about the CTU, refer to K12444: Overview of the Client
Troubleshooting Utility for Windows.

Security Advisory Status

F5 Product Development has assigned ID 949933 (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 or   |
|              |      |be        |in        |          |1     |feature        |
|              |      |vulnerable|          |          |      |               |
+--------------+------+----------+----------+----------+------+---------------+
|              |7.2.x |7.2.1     |7.2.1.1   |          |      |               |
|              +------+----------+----------+          |      |Client         |
|APM Clients   |      |7.1.9 -   |          |High      |7.8   |Troubleshooting|
|              |7.1.x |7.1.9.7   |None      |          |      |Utility on     |
|              |      |7.1.5 -   |7.1.8.5   |          |      |Windows        |
|              |      |7.1.8     |          |          |      |               |
+--------------+------+----------+----------+----------+------+---------------+
|              |16.x  |16.0.0 -  |16.0.1.1  |          |      |               |
|              |      |16.0.1    |          |          |      |               |
|              +------+----------+----------+          |      |               |
|              |15.x  |15.1.0 -  |None      |          |      |               |
|              |      |15.1.2^2  |          |          |      |               |
|              +------+----------+----------+          |      |               |
|              |14.x  |14.1.0 -  |None      |          |      |Client         |
|              |      |14.1.3^2  |          |          |      |Troubleshooting|
|BIG-IP (APM)  +------+----------+----------+High      |7.8   |Utility on     |
|              |13.x  |13.1.0 -  |13.1.3.6  |          |      |Windows        |
|              |      |13.1.3    |          |          |      |               |
|              +------+----------+----------+          |      |               |
|              |12.x  |12.1.0 -  |None      |          |      |               |
|              |      |12.1.5    |          |          |      |               |
|              +------+----------+----------+          |      |               |
|              |11.x  |11.6.1 -  |None      |          |      |               |
|              |      |11.6.5    |          |          |      |               |
+--------------+------+----------+----------+----------+------+---------------+
|              |16.x  |None      |Not       |          |      |               |
|              |      |          |applicable|          |      |               |
|              +------+----------+----------+          |      |               |
|              |15.x  |None      |Not       |          |      |               |
|BIG-IP (LTM,  |      |          |applicable|          |      |               |
|AAM, Advanced +------+----------+----------+          |      |               |
|WAF, AFM,     |14.x  |None      |Not       |          |      |               |
|Analytics,    |      |          |applicable|Not       |      |               |
|ASM, DDHD,    +------+----------+----------+vulnerable|None  |None           |
|DNS, FPS, GTM,|13.x  |None      |Not       |          |      |               |
|Link          |      |          |applicable|          |      |               |
|Controller,   +------+----------+----------+          |      |               |
|PEM, SSLO)    |12.x  |None      |Not       |          |      |               |
|              |      |          |applicable|          |      |               |
|              +------+----------+----------+          |      |               |
|              |11.x  |None      |Not       |          |      |               |
|              |      |          |applicable|          |      |               |
+--------------+------+----------+----------+----------+------+---------------+
|              |7.x   |None      |Not       |          |      |               |
|BIG-IQ        |      |          |applicable|Not       |      |               |
|Centralized   +------+----------+----------+vulnerable|None  |None           |
|Management    |6.x   |None      |Not       |          |      |               |
|              |      |          |applicable|          |      |               |
+--------------+------+----------+----------+----------+------+---------------+
|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.

^2In BIG-IP 13.1.0 and later, you can update APM client components
independently from BIG-IP software. For more information about BIG-IP Edge
Client versions, refer to K13757: BIG-IP Edge Client version matrix. To address
this vulnerability, customers running BIG-IP 13.1.0 and later can download and
install an APM Clients version listed in the Fixed introduced in column, and
then redeploy the CTU to end users. For more information, refer to K52547540:
Updating the BIG-IP Edge Client for the BIG-IP APM system.

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

Acknowledgements

F5 acknowledges Shahee Mirza of Beetles Cyber Security for bringing this issue
to our attention and for following the highest standards of coordinated
disclosure.

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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