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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-161-02) Mitsubishi Electric MELSEC iQ-R series
6 November 2020
AusCERT Security Bulletin Summary
Product: Mitsubishi Electric MELSEC iQ-R series
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2020-13238
Revision History: November 6 2020: ICS-CERT appended Update B to advisory
June 10 2020: Initial Release
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ICS Advisory (ICSA-20-161-02)
Mitsubishi Electric MELSEC iQ-R Series (Update B)
Original release date: November 05, 2020
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1. EXECUTIVE SUMMARY
o CVSS v3 5.3
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Mitsubishi Electric
o Equipment: MELSEC iQ-R Series
o Vulnerability: Resource Exhaustion
2. UPDATE INFORMATION
This updated advisory is a follow-up to the advisory update titled
ICSA-20-161-02 Mitsubishi Electric MELSEC iQ-R series (Update A) that was
published June 16, 2020 to the ICS webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of this vulnerability could cause the Ethernet port to
enter a denial-of-service condition.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
- --------- Begin Update B Part 1 of 2 ---------
Mitsubishi Electric reports that the vulnerability affects the following MELSEC
iQ-R series modules:
o R00/01/02CPU: Firmware Versions 7 or earlier
o R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 39 or earlier
o R08/16/32/120SFCPU: Firmware Versions 20 or earlier
o R08/16/32/120PCPU: Firmware Versions 24 or earlier
o R08/16/32/120PSFCPU: Firmware Versions 05 or earlier
RJ71EN71: Firmware This updated advisory is a follow-up to the advisory update
titled ICSA-20-161-02 Mitsubishi Electric MELSEC iQ-R series (Update A) that
was published June 16, 2020 on the ICS webpage on us-cert.cisa.gov.
o Versions 49 or earlier
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4.2 VULNERABILITY OVERVIEW
4.2.1 UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400
Uncontrolled resource consumption can be caused when an attacker sends a large
amount of specially crafted packets in bursts over a short period.
CVE-2020-13238 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:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
Yossi Reuven of SCADAfence reported this vulnerability to Mitsubishi Electric.
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Mitsubishi Electric has fixed the following versions to discard packets when
specially crafted packets are received:
o R00/01/02CPU: Firmware Versions 8 or later
o R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 40 or later
o R08/16/32/120SFCPU: Firmware Versions 21 or later
o R08/16/32/120PCPU: Firmware Versions 25 or later
o R08/16/32/120PSFCPU: Firmware Versions 06 or later
o RJ71EN71: Firmware Versions 50 or later
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Mitsubishi Electric recommends users of the affected devices take the following
measures for cyber-attacks such as DoS attack or unauthorized access from
untrusted networks or hosts.
o Connection to untrusted networks or hosts: Check whether the modules
mounted in the equipment used are connected to untrusted networks or hosts.
o Firewalls: If the modules are connected to untrusted networks or hosts,
check whether measures such as firewalls are properly configured.
o Additional information about the vulnerability is available by contacting a
Mitsubishi Electric representative .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Use secure methods when remote access is required, such as virtual private
networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the 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
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:
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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