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AUSCERT External Security Bulletin Redistribution
ESB-2021.3525
Advisory (icsa-21-294-03) ICONICS GENESIS64 and Mitsubishi
Electric MC Works64 OPC UA
22 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: ICONICS GENESIS64
Mitsubishi Electric MC Works64
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27432
Reference: ESB-2021.1652
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-294-03
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ICS Advisory (ICSA-21-294-03)
ICONICS GENESIS64 and Mitsubishi Electric MC Works64 OPC UA
Original release date: October 21, 2021
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 7.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendors: ICONICS, Mitsubishi Electric
o Equipment: ICONICS GENESIS64, Mitsubishi Electric MC Works64
o Vulnerability: Uncontrolled Recursion
2. RISK EVALUATION
Successful exploitation of this vulnerability could trigger a stack overflow.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following ICONICS and Mitsubishi Electric modules are affected in some
third-party OPC Foundation products:
o GENESIS64: Versions 10.97 and prior
o Hyper Historian: Versions 10.97 and prior
o AnalytiX: Versions 10.97 and prior
o MobileHMI: Versions 10.97 and prior
o MC Works64: Versions 4.04E and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 UNCONTROLLED RECURSION CWE-674
The affected products are vulnerable to an uncontrollable recursion, which may
trigger a stack-based buffer overflow.
CVE-2021-27432 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: ICONICS is headquartered in the United
States. Mitsubishi Electric is headquartered in Japan.
3.4 RESEARCHER
Eran Jacob with the Otorio Research Team reported this vulnerability to CISA.
4. MITIGATIONS
ICONICS and Mitsubishi Electric are releasing Critical Fix Rollup packages or
patches that will include the solution to this vulnerability. GENESIS64
Versions 10.97.1 and later will not be vulnerable to this exploit.
ICONICS and Mitsubishi Electric recommend users take the following mitigations:
o Place control system networks and devices behind firewalls to isolate them
from the business network.
o Minimize network exposure for all control system devices. Control system
devices should not directly face the Internet.
o Do not click web links or open unsolicited attachments in e-mail messages.
o Leverage OPC UA security and certificates to ensure ICONICS products only
connect to trusted OPC UA servers and clients.
o Install the applicable Critical Fixes Rollup, if available.
ICONICS provides information and useful links related to its security updates
at its company website .
Mitsubishi Electric provides information and useful links related to its
security updates its company website .
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 that 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 us-cert.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 us-cert.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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