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There is a buffer overflow vulnerability with proof-of-concept (PoC) exploit code and three other holes affecting 3S CoDeSys web server, a supervisory control and data acquisition/human-machine interface (SCADA/HMI) product.

According to this report, the vulnerability is exploitable by sending specially crafted packets to the server Port 8080/TCP. Celil Unuver of SignalSEC Labs released the report. ICS-CERT is coordinating the vulnerability with the security researcher and the vendor.

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The three other vulnerabilites are the result of research done by Luigi Auriemma without coordination by ICS-CERT and the vendor.

ICS-CERT is issuing this updated alert to provide notice of the additional report vulnerabilities and to identify baseline mitigations for reducing risks to this and other cyber security attacks.

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The first vulnerability is a stack based buffer overflow that could lead to a denial of service or a possible remote code execution. There are three other vulnerabilities including an integer overflow, a null pointer (method 1) and a null pointer (method 2) which could lead to a denial of service. All four vulnerabilities are remotely exploitable.

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

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

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