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AUSCERT External Security Bulletin Redistribution
ESB-2022.6281
Advisory (icsa-22-335-01) Mitsubishi Electric MELSEC iQ-R Series
2 December 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MELSEC iQ-R Series
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-40265
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-335-01
Comment: CVSS (Max): 8.6 CVE-2022-40265 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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ICS Advisory (ICSA-22-335-01)
Mitsubishi Electric MELSEC iQ-R Series
Original release date: December 01, 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 8.6
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Mitsubishi Electric
o Equipment: MELSEC iQ-R Series
o Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a remote
unauthenticated attacker to cause a denial-of-service condition on a target
product by sending specially crafted packets.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Mitsubishi Electric MELSEC iQ-R Series products are affected:
o RJ71EN71: Firmware version "65" and prior
o R04/08/16/32/120ENCPU: Network part firmware version "65" and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
MELSEC iQ-R Series RJ71EN71 products with firmware versions prior to "65" and
R04/08/16/32/120ENCPU products with Network firmware versions prior to "65" are
vulnerable to improper input validation. A remote unauthenticated user could
cause a denial-of-service condition on a target product by sending specially
crafted packets. A system reset is required to recover from a denial-of-service
condition.
CVE-2022-40265 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/
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 has fixed the vulnerability in the following MELSEC iQ-R
Series products:
o RJ71EN71: Update firmware version to "66" or later .
o R04/08/16/32/120ENCPU: Update network part firmware version to "66" or
later .
Users should refer to the following product manual for instructions to update
firmware:
o MELSEC iQ-R Module Configuration Manual "Firmware Update Function."
Mitsubishi Electric recommends users take the following mitigation measures to
minimize the risk of an unauthenticated user exploiting this vulnerability:
o Use a firewall, virtual private network (VPN), etc. to prevent unauthorized
access when internet access is required.
o Use the product within a local area network (LAN)
o Block access from untrusted networks and hosts through firewalls.
o Use the IP filter function to restrict the accessible IP addresses.
Note: For using the IP filter function, users should see MELSEC iQ-R Ethernet
User's Manual (Application) Security "IP filter"
Users can refer to the Mitsubishi Electric advisory for further details.
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 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 .
Organizations observing suspected malicious activity should follow established
internal procedures and report 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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