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

                               ESB-2021.0949
                BIG-IP APM VPN vulnerability CVE-2021-23002
                               18 March 2021

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

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

Product:           BIG-IP APM
                   APM Clients
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Confidential Data -- Existing Account
                   Reduced Security         -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-23002  

Original Bulletin: 
   https://support.f5.com/csp/article/K71891773

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K71891773: BIG-IP APM VPN vulnerability CVE-2021-23002

Original Publication Date: 11 Mar, 2021
Latest   Publication Date: 18 Mar, 2021

Security Advisory Description

The session ID is visible in the arguments of the f5vpn.exe command when VPN is
launched from the browser on a Windows system. Addressing this issue requires
both the client and server fixes. (CVE-2021-23002)

Impact

An attacker with privileges to view the command line of the process may be able
to view the session ID. If the session ID is exposed to the attacker,
the attacker can use this information to launch further attacks.

Security Advisory Status

F5 Product Development has assigned IDs 937637, 976925, and 973177 (BIG-IP APM)
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 -  |16.0.1.1 ^  |          |      |             |
|              |      |16.0.1    |2,4         |          |      |             |
|              +------+----------+------------+          |      |             |
|              |15.x  |15.1.0 -  |15.1.2.1 ^  |          |      |             |
|              |      |15.1.2    |2,3         |          |      |             |
|              +------+----------+------------+          |      |             |
|              |14.x  |14.1.0 -  |14.1.4 ^2,4 |          |      |             |
|              |      |14.1.3    |            |          |      |BIG-IP APM   |
|BIG-IP APM    +------+----------+------------+Medium    |6.1   |browser-based|
|              |13.x  |13.1.0 -  |13.1.3.6 ^  |          |      |VPN          |
|              |      |13.1.3    |2,4         |          |      |             |
|              +------+----------+------------+          |      |             |
|              |12.x  |12.1.0 -  |None        |          |      |             |
|              |      |12.1.5    |            |          |      |             |
|              +------+----------+------------+          |      |             |
|              |11.x  |11.6.1 -  |None        |          |      |             |
|              |      |11.6.5    |            |          |      |             |
+--------------+------+----------+------------+----------+------+-------------+
|              |      |7.2.1     |7.2.1.1^5   |          |      |BIG-IP APM   |
|APM Clients   |7.x   |7.1.9     |7.1.9.8^5   |Medium    |6.1   |browser-based|
|              |      |7.1.5 -   |7.1.8.5^5   |          |      |VPN          |
|              |      |7.1.8     |            |          |      |             |
+--------------+------+----------+------------+----------+------+-------------+
|              |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  |          |      |             |
+--------------+------+----------+------------+----------+------+-------------+
|              |8.x   |None      |Not         |          |      |             |
|              |      |          |applicable  |          |      |             |
|BIG-IQ        +------+----------+------------+          |      |             |
|Centralized   |7.x   |None      |Not         |Not       |None  |None         |
|Management    |      |          |applicable  |vulnerable|      |             |
|              +------+----------+------------+          |      |             |
|              |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 APM 13.1.0 and later, the APM Clients components can be updated
independently from BIG-IP software. For more information, refer to K52547540:
Updating BIG-IP Edge Client for the BIG-IP APM system.

^3BIG-IP APM 15.1.2.1 includes the server fix but does not include the client
fix. After upgrading or updating to BIG-IP 15.1.2.1, you must also update APM
Clients to a version listed in the Fixes introduced in column and install the
fix on the client side. To install the fix on the client side, you can set
Component Update to Yes in the affected Connectivity Profile OR redeploy and
install the browser VPN helper application on all users' client machines. For
more information, refer to K81649656: Overview of APM Clients update on BIG-IP
APM. 

^4BIG-IP APM 13.1.3.6, 14.1.4 and 16.0.1.1 are shipped with APM Clients version
7.1.8.5, which includes the client fix. You need to install this fix on the
client side. You can do so by setting Component Update to Yes in the affected
Connectivity Profile or redeploy and install the browser VPN helper application
on all users' client machines. For more information, refer to 
K81649656: Overview of APM Clients update on BIG-IP APM 

^5When you update APM Clients to 7.1.8.5, 7.1.9.8, or 7.2.1.1 listed in the
fixed column, you may encounter the known issue described in K25173042: Browser
network access VPN clients may not establish the first time after an APM
Clients auto update and K39454429: Browser network access VPN clients fail to
establish a VPN connection.

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

To mitigate this vulnerability, you can use the BIG-IP Edge Client for VPN
access instead of the browser-based VPN.

Acknowledgements

F5 acknowledges Raeez Abdulla of CodeGreen Systems, UAE for bringing this issue
to our attention and for following the highest standards of coordinated
disclosure.

Supplemental Information

o K13757: BIG-IP Edge Client version matrix
  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 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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