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AUSCERT External Security Bulletin Redistribution
ESB-2022.1120
Advisory (icsa-22-074-01) ABB OPC Server for AC 800M
16 March 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: ABB OPC Server for AC 800M
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22284
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-074-01
Comment: CVSS (Max): 8.4 CVE-2021-22284 (CVSS:3.0/AV:A/AC:L/PR:L/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:A/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
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ICS Advisory (ICSA-22-074-01)
ABB OPC Server for AC 800M
Original release date: March 15, 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 8.4
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: ASEA Brown Boveri (ABB)
o Equipment: OPC Server for AC 800M
o Vulnerability: Execution with Unnecessary Privileges
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a low privileged
authenticated user to remotely execute arbitrary code.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of OPC Server, a run-time data reader, are affected:
800xA, Control Software for AC 800M:
o OPC Server for AC 800M: Versions 5.1.0-x, 5.1.1-x, 6.0.0-1 to 6.0.0-3
Control Builder Safe, 1.x and 2.0 including:
o OPC Server for AC 800M: Versions 5.1.1-1 and 6.0.0-1
Compact Product Suite - Control and I/O:
o OPC Server for AC 800M: Versions 5.1.0-x, 5.1.1-x, 6.0.0-x
3.2 VULNERABILITY OVERVIEW
3.1.1 EXECUTION WITH UNNECESSARY PRIVILEGES CWE-250
The affected products are vulnerable to an authenticated remote user with low
privileges who could successfully insert and execute arbitrary code in the node
running the AC 800M OPC Server.
CVE-2021-22284 has been assigned to this vulnerability. A CVSS v3 base score of
8.4 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:L/UI:R/S:C/C:H/
I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
3.4 RESEARCHER
William Knowles of Applied Risk reported this vulnerability to CISA.
4. MITIGATIONS
ABB advises affected users to install the updates to address the vulnerability
as follows:
o 800xA control software for AC 800M to v6.1.0-0 or later.
o 800xA, Control Software for AC 800M update to 6.0.0-4 (scheduled for
release later in 2022).
Contact ABB for update information.
Users unable to install the update are advised to review the Mitigations and
Workarounds section of the ABB advisory for additional advice on how to reduce
the risk associated with this vulnerability.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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 the business network.
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 on cisa.gov . Several recommended 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 on cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
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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