SEC Consult Vulnerability Lab Security Advisory < 20230214-0 >

           title: Multiple XSS Vulnerabilities  
         product: B&R Systems Diagnostics Manager  

vulnerable version: >=3.00 and <=C4.93
fixed version: >=D4.93
CVE number: CVE-2022-4286
impact: medium
homepage: https://www.br-automation.com
found: 2022-10-28
by: S. Robertz (Office Vienna)
G. Hechenberger (Office Vienna)
SEC Consult Vulnerability Lab

                  An integrated part of SEC Consult, an Atos company  
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                  https://www.sec-consult.com

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

Vendor description:

"Our slogan is our mission. The pursuit of Perfection in Automation has
inspired and guided B&R for over 40 years. To us, perfection means more
than developing the best solutions in industrial automation. It also means
developing the best relationships – with our customers and partners as
well as our employees and suppliers.

Keen foresight and entrepreneurial courage helped us rise quickly into
the ranks of top global players in industrial automation. An intuitive sense
of market dynamics and emerging trends has established us as a pioneer,
leading the way with the most innovative technology on the market.

Our role as the ABB Group’s global center for machine and factory automation
strengthens our position of leadership and adds new momentum to our
impressive record of sustained growth."

Source: https://www.br-automation.com/en/about-us/

Business recommendation:

The vendor provides a software update which should be installed immediately.

SEC Consult highly recommends to perform a thorough security review of the
product conducted by security professionals to identify and resolve potential
further security issues.

Vulnerability overview/description:

1. Multiple Reflected Cross-Site-Scripting Vulnerabilities (CVE-2022-4286)
   An attacker can execute arbitrary JavaScript code in the context of the
   victim’s session, thus perform all actions, exfiltrate information, etc.
   In order to exploit this vulnerability the attacker will have to trick
   the user into visiting a manipulated URL.

Proof of concept:

1. Multiple Reflected Cross-Site-Scripting Vulnerabilities (CVE-2022-4286)
   The following URL has to be visited by the victim in order to execute
   arbitrary JavaScript code.

http://<PLC-IP>/sdm/cgiFileLoop.cgi?service=javascript:alert(document.domain);%2f%2f&type=512&scope=%3Cfile:///etc/passwd%3E&module=Snapshot&option=3

A very similar vulnerability can be found at another endpoint of the
System Diagnostic Manager (SDM).

http://<PLC-IP>/sdm/svg.cgi?type=cpuusage&index=1%3Cscript%3Ealert(document.domain)%3C/script%3E

Vulnerable / tested versions:

The following device and firmware version has been tested:

• B&R X20CP3687X SwModuleVersion 186

According to the vendor, all B&R Automation Runtime (AR) versions >=3.00 and <=C4.93
are affected.

Vendor contact timeline:

2022-11-21: Contacting vendor through [email protected].
Sent encrypted advisory.
2022-11-22: Vendor requests B&R Automation Runtime version.
2022-12-01: Vendor confirms vulnerability. Will be fixed with next release.
Asking for timeline.
2022-12-13: Advisory and patch will be published on 2023-02-10.
Vendor offers to share the advisory for review purposes.
2023-01-25: Reviewing vendor advisory, receiving CVE + affected/fixed version
numbers
2023-02-10: Vendor provides the patch.
2023-02-14: Coordinated release of security advisory.

Solution:

The vendor supplies a patch, which should be installed immediately.
The following version mitigates the identified XSS issues:

• B&R Automation Runtime version >=D4.93

The vendor has published the following security advisory:
https://www.br-automation.com/downloads_br_productcatalogue/assets/1675607299099-en-original-1.0.pdf

Workaround:

Administrators can deactivate the System Diagnostics Manager in case it is not
needed.

Advisory URL:

https://sec-consult.com/vulnerability-lab/

SEC Consult Vulnerability Lab

SEC Consult, an Atos company  
Europe | Asia | North America

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EOF S. Robertz, G. Hechenberger / @2023