U.S. Flag Official website of the Department of Homeland Security
U.S. Department of Homeland Security Seal. ICS-CERT. Industrial Control Systems Cyber Emergency Response Team.
TLP:WHITE

Alert (ICS-ALERT-13-091-01)

Mitsubishi Electric Automation MX Buffer Overflow Vulnerability

Original release date: April 01, 2013 | Last revised: March 12, 2014

Legal Notice

All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/.



Summary

ICS-CERT is aware of a public report of a heap-based buffer overflow vulnerability with proof-of-concept (PoC) exploit code affecting Mitsubishi Electric Automation MX, a supervisory control and data acquisition/human-machine interface (SCADA/HMI) product. According to this report, the vulnerability is exploitable when an attacker provides specially crafted input. This report was released without coordination with either the vendor or ICS-CERT.

ICS-CERT has notified the affected vendor of the report and has asked the vendor to confirm the vulnerability and identify mitigations. ICS-CERT is issuing this alert to provide early notice of the report and identify baseline mitigations for reducing risks to these and other cybersecurity attacks.

The report included vulnerability details and PoC exploit code for the following vulnerability:

Vulnerability TypeRemotely ExploitableImpact
Buffer OverflowYesPossible Remote Code Execution
   

Please report any issues affecting control systems in critical infrastructure environments to ICS-CERT.

According to the Mitsubishi Automation Web site, MX is used to link Mitsubishi PLCs with PCs running Microsoft Windows via serial, Ethernet, or other connections.

For details, please see OSVDB: http://www.osvdb.org/show/osvdb/91661.

Follow-Up

ICS-CERT released a follow-up advisory ICSA-13-140-01 Mitsubishi MX Component V3 ActiveX Vulnerability to the ICS-CERT Web site on May 20, 2013.

Mitigation

ICS-CERT is currently coordinating with the vendor and security researcher to identify mitigations.

ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of vulnerabilities. Specifically, users should:

  • Minimize network exposure for all control system devices. Control system devices should not directly face the Internet.a
  • Locate control system networks and devices behind firewalls, and isolate them from the business network.
  • If remote access is required, employ secure methods, such as Virtual Private Networks (VPNs), recognizing that VPN is only as secure as the connected devices.


ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.

ICS-CERT also provides a recommended practices section for control systems on the US-CERT Web site. Several recommended practices are available for reading or download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.b

Organizations that observe any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.


Contact Information

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

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

The NCCIC continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.

Was this document helpful?  Yes  |  Somewhat  |  No

Back to Top