ICS Advisory (ICSA-22-335-01)

Mitsubishi Electric MELSEC iQ-R Series

Click to Tweet.
Click to send to Facebook.
Click to Share.

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

  • CVSS v3 8.6
  • ATTENTION: Exploitable remotely/low attack complexity 
  • Vendor: Mitsubishi Electric 
  • Equipment: MELSEC iQ-R Series 
  • 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: 

  • RJ71EN71: Firmware version “65” and prior 
  • 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

  • CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing 
  • COUNTRIES/AREAS DEPLOYED: Worldwide 
  • 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: 

Users should refer to the following product manual for instructions to update firmware: 

Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of an unauthenticated user exploiting this vulnerability: 

  • Use a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required. 
  • Use the product within a local area network (LAN)  
  • Block access from untrusted networks and hosts through firewalls. 
  • 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:

  • Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet.
  • Locate control system networks and remote devices behind firewalls and isolate them from business networks.
  • 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. 


Contact Information

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
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

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.

This product is provided subject to this Notification and this Privacy & Use policy.

Please share your thoughts.

We recently updated our anonymous product survey; we'd welcome your feedback.