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AUSCERT External Security Bulletin Redistribution
ESB-2022.6218
Advisory (icsa-22-333-01) Mitsubishi Electric GOT2000
30 November 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric GOT2000
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-40266
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-333-01
Comment: CVSS (Max): 5.3 CVE-2022-40266 (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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ICS Advisory (ICSA-22-333-01)
Mitsubishi Electric GOT2000
Original release date: November 29, 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 5.3
o ATTENTION: Exploitable remotely
o Vendor: Mitsubishi Electric
o Equipment: GOT2000 Series
o Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to cause
a denial-of-service condition by sending a specially crafted command.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Mitsubishi Electric GOT2000 Series products are affected:
o GT27 Model: FTP server versions 01.39.000 and prior
o GT25 Model: FTP server versions 01.39.000 and prior
o GT23 Model: FTP server versions 01.39.000 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
The affected GOT2000 Series devices with FTP server versions 01.39.000 and
prior are vulnerable to improper input validation, which could allow an
attacker to cause a denial-of-service condition by sending a specially crafted
command.
CVE-2022-40266 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/
C:N/I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Mitsubishi Electric reported this vulnerability to CISA.
4. MITIGATIONS
Mitsubishi Electric recommends users update to the latest software versions:
o GT27 Model: Update to FTP server versions 01.47.000 or later
o GT25 Model: Update to FTP server versions 01.47.000 or later
o GT23 Model: Update to FTP server versions 01.47.000 or later
The following steps were provided by Mitsubishi Electric to assist users in
applying the update:
1. Download the fixed version of GT Designer3 Version1 (GOT2000) and install on
a compatible device.
o Users should contact Mitsubishi Electric for GT Designer3 Version1
(GOT2000).
2. Start the GT Designer3 Version1 (GOT2000) and open the project data used in
affected products.
3. Select [Write to GOT] from [Communication] menu to write the required
package data to the GOT.
o Users can refer to the GT Designer3 Version1 (GOT2000) Screen Design Manual
(SH-081220ENG). "COMMUNICATING WITH GOT"
4. After writing the required package data to the GOT, refer to the <How to
check the versions in use> and ensure the software has been updated to the
fixed versions.
Mitsubishi Electric also recommends users to take steps to mitigate risk of
vulnerability exploitation:
o When internet access is required, use a virtual private network (VPN) or
other secure means to prevent unauthorized access.
o Only use products inside a local area network (LAN).
o Block access from untrusted networks and hosts.
o Install antivirus software on the host where products are installed.
o Set strong passwords to prevent unauthorized login.
o Use the IP filter function*1 to control IP address access to the host
machine with installed software
*1: GT Designer3 (GOT2000) Screen Design Manual (SH-081220ENG). "5.4.3
Setting the IP filter"
Users should refer to Mitsubishi Electric's security advisory for further
information.
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/ics 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/ics 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.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open attachments in unsolicited email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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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