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AUSCERT External Security Bulletin Redistribution
ESB-2022.4081
Advisory (icsa-22-228-05) B&R Industrial Automation Automation Studio 4
17 August 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Automation Studio 4
Publisher: ICS-CERT
Operating System: Windows
Resolution: Mitigation
CVE Names: CVE-2021-22289
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-228-05
Comment: CVSS (Max): 8.3 CVE-2021-22289 (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
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ICS Advisory (ICSA-22-228-05)
B&R Industrial Automation Automation Studio 4
Original release date: August 16, 2022
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.3
o ATTENTION: Exploitable remotely
o Vendor: B&R Industrial Automation
o Equipment: Automation Studio 4
o Vulnerability: Unrestricted Upload of File with Dangerous Type
2. RISK EVALUATION
An attacker could leverage this vulnerability to execute code within the
context of the affected system, which may threaten the integrity and
confidentiality of data or cause a denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
B&R Automation reports the vulnerabilities affect the following versions of
Automation Studio, a programmable logic controller (PLC) automation programming
software:
o Automation Studio 4: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
If the PLC has not been sufficiently secured, an attacker could manipulate
stored project information. Alternatively, a remote attacker may use spoofing
techniques to connect B&R Automation Studio to an attacker-controlled device
with manipulated project files. When using project upload in B&R Automation
Studio, such crafted projects will be loaded and opened in the security context
of Automation Studio. This may result in remote code execution, information
disclosure, and denial-of-service of the system running B&R Automation Studio.
CVE-2021-22289 has been assigned to this vulnerability. A CVSS v3 base score of
8.3 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:C/C:H/
I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Austria
3.4 RESEARCHER
Mr. Mashav Sapir of Claroty reported this vulnerability to CISA.
4. MITIGATIONS
Note: This feature is not activated by default. Do not use or enable the
feature if it is not necessary for projects.
B&R recommends users using this vulnerable project upload feature employ the
following mitigations to minimize the risk of vulnerability exploitation:
o Use only Automation Network Service Link (ANSL) over SSL and enable
authentication on the PLC.
o Configure password protection when using the "Backing up project source
files on the target system" feature. Use strong passwords.
o Protect networks with PLCs from unauthorized access by using firewalls.
o Do not run B&R Automation Studio with elevated user privileges.
o Verify the integrity of B&R Automation Studio project files, which are
exchanged via potentially insecure channels (e. g., using hashes or digital
signatures).
o Ensure Windows User Access Control (UAC) is enabled
In general, B&R recommends implementing B&R Cyber Security guidelines . For
additional information and support, users should contact B&R directly.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability these vulnerabilities. Specifically, users
should:
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls and
isolate them from business networks.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage at cisa.gov/ics . Several CISA products detailing cyber
defense best practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
No known public exploits specifically target this vulnerability. This
vulnerability has a high attack complexity.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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