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ICS-CERT is aware of a public report of a vulnerability with proof of concept (POC) exploit code affecting Beckhoff TwinCAT, a SCADA/HMI Product. According to the report, services running on Port 48899\UDP are vulnerable. This report was released without coordination with either the vendor or ICS-CERT.
ICS-CERT has not yet verified the vulnerabilities or POC code, but has reached out to the affected vendor to notify, confirm, 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 proof-of-concept exploit code for the following vulnerability:
|Undetermined||Remote||Denial of Service|
Please report any issues affecting control systems in critical infrastructure environments to ICS-CERT.
Beckhoff TwinCAT is a software system that is capable of controlling multiple programmable logic controllers in a system. This system is used in many industries including manufacturing, energy, water and wastewater, and building automation. Beckhoff is headquartered in Verl, Germany.
ICS-CERT released a follow-up advisory, ICSA-11-263-03 - Beckhoff TwinCat Read Access Violation, on October 05, 2011.
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).
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.
The Control System Security Program 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.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
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