ICS Alert (ICS-ALERT-12-020-05A)

Koyo ECOM100 Multiple Vulnerabilities (Update A)

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This Alert Update is a follow-up to the original ICS-CERT Alert titled “ICS-ALERT-12-020-05 - Koyo Ecom100 Vulnerabilities” that was published January 20, 2012, on the ICS-CERT web page.

ICS-CERT is aware of a public report of vulnerabilities with proof-of-concept (PoC) exploit code affecting the Koyo ECOM100 Ethernet Module. This module is used to communicate between a PLC and the control system. This report is based on information presented by Reid Wightman during Digital Bond’s SCADA Security Scientific Symposium (S4) on January19, 2012. Vulnerability details were released without coordination with either the vendor or ICS-CERT.

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A brute force password cracking tool has been released that targets the weak authentication vulnerability in the ECOM series modules. This tool may greatly reduce the time and skill level required to attack a vulnerable system.

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ICS-CERT is attempting to notify the affected vendor of the report to ask the vendor to confirm the vulnerabilities and identify mitigations. ICS-CERT is issuing this alert to provide preliminary notice of the reported vulnerable products and to begin identifying baseline mitigations that can reduce the risk of cybersecurity attacks exploiting these vulnerabilities.

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

Vulnerability TypeExploitabilityImpact
Weak Authentication
Uses 8-byte passcode
RemoteLoss of Integrity
Replay AttackRemoteLoss of Integrity
Web Server No
RemoteOpen Authentication / Loss of Integrity
Web Server Buffer
RemoteDenial of Service
Web Server Cross-Site
Scripting (XSS)
RemoteLoss of Integrity
Resource ExhaustionRemoteDenial of Service and Web Server Crash

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


ICS-CERT released a follow-up advisory, ICSA-12-102-02 - Koyo Ecom Modules Vulnerabilities, to the ICS-CERT web page on April 11, 2012.


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

ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these 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.

The Control Systems Security Program (CSSP) also provides a recommended practices section for control systems on the US-CERT website. Several recommended practices are available for reading or download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

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 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

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