CVSS v3 7.5
ATTENTION: Exploitable remotely/low skill level to exploit
Successful exploitation of this vulnerability could allow a remote attacker to send specially crafted packets to the device, causing Ethernet communication to stop.
The following MELSEC-Q series PLCs are affected:
A remote attacker can send specific bytes over Port 5007 that will result in an Ethernet stack crash.
Tri Quach of Amazon’s Customer Fulfillment Technology Security (CFTS) group reported this vulnerability to NCCIC.
Mitsubishi Electric has produced a new version of the firmware. Additional information about this vulnerability or Mitsubishi electric’s compensating control is available by contacting a local Mitsubishi Electric representative, which can be found at the following location:
Mitsubishi Electric strongly recommends that users should operate the affected device behind a firewall.
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC 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
For industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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