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AUSCERT External Security Bulletin Redistribution
ESB-2020.0435.6
BIG-IP Edge Client for Windows vulnerability CVE-2020-5855
15 March 2021
===========================================================================
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
Revision History: March 15 2021: Issue with vendor update and fixes introduced
November 19 2020: Vendor added fixes introduced
September 18 2020: Vendor updated advisory
September 4 2020: Vendor updated product matrix
March 4 2020: Additional versions known vulnerable
February 6 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K55102004: BIG-IP Edge Client for Windows vulnerability CVE-2020-5855
Original Publication Date: 06 Feb, 2020
Latest Publication Date: 12 Mar, 2021
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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |16.0.0 - |16.0.1.1 | | | |
| | |16.0.1^2 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |15.1.2 | | | |
| | |15.1.1^2 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |14.1.3.1 | | | |
| | |14.1.2^2 | | | |Edge |
|BIG-IP (APM) +------+----------+----------+Medium |4.3 |Client for|
| |13.x |13.1.0 - |13.1.3.5 | | |Windows |
| | |13.1.3^2 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |12.1.5.3* | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |None | | | |
| | |11.6.5^3 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| | | |7.2.1 | | |Edge |
|BIG-IP (APM |7.x |7.1.9 |7.1.9.7 |Medium |4.3 |Client for|
|Clients) | |7.1.5 - |7.1.8.4 | | |Windows |
| | |7.1.8 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |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| | |
+-------------------+------+----------+----------+----------+------+----------+
^*An issue with the bigd process has been discovered in version 12.1.5.3. For
more information, refer to K50524736: Bigd process memory leak after updating
to BIG-IP 12.1.5.3.
^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.
^3F5 will not develop a fix for vulnerable products that do not already have a
fixed version listed in this article, and will not update this table with
subsequent vulnerable releases in the associated branches. F5 recommends that
you update to more recent, non-vulnerable versions whenever feasible. For more
information, refer to K4602: Overview of the F5 security vulnerability response
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.
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 - 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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