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AUSCERT External Security Bulletin Redistribution
ESB-2020.3491.2
Advisory (icsa-20-282-02) Mitsubishi Electric MELSEC iQ-R Series
30 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MELSEC iQ-R Series
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-16850
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-282-02
Revision History: October 30 2020: Update advisory included updated affected firmware versions list
October 9 2020: Initial Release
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ICS Advisory (ICSA-20-282-02)
Mitsubishi Electric MELSEC iQ-R Series (Update A)
Original release date: October 29, 2020
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 skill level to exploit
o Vendor: Mitsubishi Electric
o Equipment: MELSEC iQ-R Series
o Vulnerability: Uncontrolled Resource Consumption
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-20-282-02 Mitsubishi Electric MELSEC iQ-R Series that was published
October 8, 2020, to the ICS webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of this vulnerability could result in a
denial-of-service condition due to uncontrolled resource consumption.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following MELSEC iQ-R series modules are affected:
- --------- Begin Update A Part 1 of 2 ---------
o R00/01/02CPU, Firmware Versions 20 and earlier
o R04/08/16/32/120(EN)CPU, Firmware Versions 52 and earlier
o R08/16/32/120SFCPU, Firmware Versions 22 and earlier
o R08/16/32/120PCPU, All versions
o R16/32/64MTCPU, All versions
- --------- End Update A Part 1 of 2 ---------
4.2 VULNERABILITY OVERVIEW
4.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
An uncontrolled resource consumption (CWE-400) vulnerability resulting in a
denial-of-service condition may be caused when an attacker sends specially
crafted packets to MELSEC iQ-R series modules.
CVE-2020-16850 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/C:N/
I:N/A:H ).
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS : Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED : Worldwide
o COMPANY HEADQUARTERS LOCATION : Japan
4.4 RESEARCHER
Yossi Reuven of SCADAfence reported this vulnerability to Mitsubishi Electric.
5. MITIGATIONS
- --------- Begin Update A Part 2 of 2 ---------
The following modules have been patched:
o R00/01/02CPU: Firmware Versions 21 or later
o R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 53 or later
o R08/16/32/120SFCPU: Firmware Versions 23 or later
- --------- End Update A Part 2 of 2 ---------
Mitsubishi Electric plans to release a patch during the coming months, and this
publication will be updated with that patch information once available. Please
contact a Mitsubishi Electric representative for additional details.
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 if Internet access is required.
o Use within a LAN and block access from untrusted networks and hosts through
firewalls.
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 .
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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