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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0435
        BIG-IP Edge Client for Windows vulnerability CVE-2020-5855
                              6 February 2020

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

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

Product:           BIG-IP Edge Client for Windows
Publisher:         F5 Networks
Operating System:  Windows
Impact/Access:     Denial of Service        -- Console/Physical
                   Access Confidential Data -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-5855  

Original Bulletin: 
   https://support.f5.com/csp/article/K55102004

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K55102004:BIG-IP Edge Client for Windows vulnerability CVE-2020-5855

Security Advisory

Original Publication Date: 06 Feb, 2020

Security Advisory Description

When the Windows Logon Integration feature is configured for BIG-IP Edge
Client, unauthorized users who have physical access to an authorized user's
machine can get shell access under unprivileged user. (CVE-2020-5855)

Impact

Attackers may be able to bypass authentication to gain unauthorized access to
internal resources or compromise the availability of the resources.

Security Advisory Status

F5 Product Development has assigned ID 842717 (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 |
|                   |      |be        |in        |          |1     |or feature|
|                   |      |vulnerable|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |15.x  |15.0.0 -  |None      |          |      |          |
|                   |      |15.1.0    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |14.x  |14.1.0 -  |None      |          |      |          |
|                   |      |14.1.2    |          |          |      |          |
|                   +------+----------+----------+          |      |Edge      |
|BIG-IP (APM)       |13.x  |13.1.0 -  |None      |Medium    |4.3   |Client for|
|                   |      |13.1.3    |          |          |      |Windows   |
|                   +------+----------+----------+          |      |          |
|                   |12.x  |12.1.0 -  |None      |          |      |          |
|                   |      |12.1.5    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |11.5.2 -  |None      |          |      |          |
|                   |      |11.6.5    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|BIG-IP (APM        |      |7.1.5 -   |          |          |      |Edge      |
|Clients)           |7.1.x |7.1.8     |None^2    |Medium    |4.3   |Client for|
|                   |      |          |          |          |      |Windows   |
+-------------------+------+----------+----------+----------+------+----------+
|                   |15.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |14.x  |None      |Not       |          |      |          |
|BIG-IP (LTM, AAM,  |      |          |applicable|          |      |          |
|AFM, Analytics,    +------+----------+----------+          |      |          |
|ASM, DNS, FPS, GTM,|13.x  |None      |Not       |Not       |None  |None      |
|Link Controller,   |      |          |applicable|vulnerable|      |          |
|PEM)               +------+----------+----------+          |      |          |
|                   |12.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |7.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IQ Centralized |6.x   |None      |Not       |Not       |None  |None      |
|Management         |      |          |applicable|vulnerable|      |          |
|                   +------+----------+----------+          |      |          |
|                   |5.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, you can update the APM Clients components
independently from BIG-IP software.  For more information, refer to K52547540:
Updating the BIG-IP Edge Client for the BIG-IP APM system. To address this
vulnerability in BIG-IP 13.1.0 and later, download and install an APM Clients
version listed in the Fixes introduced in column and redeploy to end users.

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

To mitigate this vulnerability, you can configure the following Windows
registry entries on the client machine connecting to the BIG-IP APM system to
disallow several Internet Explorer keyboard short cuts. To do so, perform the
following procedure:

For more information about configuring registry entries, refer to the Using the
Registry documentation on the Microsoft Docs website.

Note: This link takes you to a resource outside of AskF5, and it is possible
that the document may be removed without our knowledge.

Impact of action: Performing the following procedure should not have a negative
impact on your client system.

 1. Log in to the Windows client machine.
 2. To open the Registry Editor, select and hold (or right-click) Start 
    and select Run.
 3. For Open, enter regedit, then select OK.
 4. Edit the registry entries as follows:

    Windows Registry Editor Version 5.00

    [HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\
    Restrictions]
    "NoFileOpen"=dword:00000001
    "NoFileNew"=dword:00000001
    "NoOpeninNewWnd"=dword:00000001

 5. Save the entries and exit the Registry Editor.

Acknowledgements

F5 would like to acknowledge Michael Molho of e-Xpert Solutions SA for bringing
this issue to our attention and for following the highest standards of
coordinated disclosure.

Supplemental Information

o K40131499: Configuring Dialup Entry/Windows Logon Integration
  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 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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