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AUSCERT External Security Bulletin Redistribution
ESB-2021.3921
Advisory (icsa-21-320-02) Mitsubishi Electric GOT products
17 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric GOT
Publisher: ICS-CERT
Operating System: Network Appliance
Windows
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20601
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-320-02
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ICS Advisory (ICSA-21-320-02)
Mitsubishi Electric GOT products
Original release date: November 16, 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 Vendor: Mitsubishi Electric
o Equipment: GOT2000 series, GOT SIMPLE series, GT SoftGOT2000
o Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow the system's
operations to be adversely affected.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Mitsubishi Electric human-machine interface (HMI) products are
affected:
o GOT2000 series
GT27 model: All versions
GT25 model: All versions
GT23 model: All versions
GT21 model: All versions
o GOT SIMPLE series
GS21 model: All versions
o GT SoftGOT2000: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
The affected product is vulnerable to an information tampering vulnerability,
which may allow an attacker to send a malicious packet to rewrite the device
value and adversely affect the system's operation.
CVE-2021-20601 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:H/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Parul Sindhwad and Dr. Faruk Kazi of COE-CNDS Lab, VJTI, Mumbai, India,
reported this vulnerability to Mitsubishi Electric.
4. MITIGATIONS
Mitsubishi Electric recommends users take measures such as installing a
firewall to protect the GOT and system from unauthorized access from external
equipment via the network.
Mitsubishi Electric recommends users take the following mitigation measures to
minimize the risk of exploiting this vulnerability:
o Use a firewall or virtual private network (VPN), etc. to prevent
unauthorized access when Internet access is required.
o Use the products within a LAN and block access from untrusted networks and
hosts.
o Install antivirus software on user computers with access to the product and
the system.
o Use the IP filter function to restrict the accessible IP addresses.
For more information, please contact the local Mitsubishi Electric
representative or refer to the Mitsubishi Electric support website .
For specific update instructions and additional details, see the Mitsubishi
Electric advisory .
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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