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1. EXECUTIVE SUMMARY
- CVSS v3 8.1
- ATTENTION: Exploitable remotely
- Vendor: Mitsubishi Electric
- Equipment: MELSEC-Q/L Series and iQ-R Series
- Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could result in a denial-of-service condition and/or enable remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of MELSEC-Q Ethernet Interface Module, MELSEC-L Ethernet Interface Module, and MELSEC iQ-R MES Interface Module are affected:
- MELSEC-Q Series QJ71E71-100: First five digits of serial number 24061 and prior
- MELSEC-L Series LJ71E71-100: First five digits of serial number 24061 and prior
- MELSEC iQ-R Series RD81MES96N: firmware Version 08 and prior
3.2 VULNERABILITY OVERVIEW
The affected product is vulnerable to an improper input validation in various web functions, which could allow an attacker to perform remote code execution or cause a denial-of-service condition.
CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: Japan
Mitsubishi Electric reported this vulnerability to CISA.
Mitsubishi Electric has fixed this vulnerability in the following products:
- MELSEC-Q Series QJ71E71-100: First five digits of serial number 24062 and later
- MELSEC-L Series LJ71E71-100: First five digits of serial number 24062 and later
- MELSEC iQ-R Series RD81MES96N: firmware Version 09 and later
For more information on how to patch individual systems, please contact Mitsubishi Electric support.
If updating to a fixed version is not possible, Mitsubishi Electric recommends users take the following mitigations to minimize risk:
- Use a firewall, virtual private network (VPN), web application firewall (WAF), etc. to prevent unauthorized access when Internet access is required.
- 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. 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.
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:
Toll Free: 1-888-282-0870
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