ICS Alert

3S CoDeSys Vulnerabilities (Update A)

Last Revised
Alert Code
ICS-ALERT-11-336-01A

Description

This December 2011 alert is a follow-up to the original ICS-CERT Alert titled “ICS-ALERT-11-336-01—3S CODESYS WEBSERVER BUFFER OVERFLOW” that was published December 02, 2011.

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Summary

This Alert Update is a follow-up to the original ICS-CERT Alert titled “ICS-ALERT-11-336-01—3S CODESYS WEBSERVER BUFFER OVERFLOW” that was published December 02, 2011, on the ICS-CERT web page.

ICS-CERT is aware of public reporting of a buffer overflow vulnerability with proof-of-concept (PoC) exploit code 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. This report was released by Celil Unuver of SignalSEC Labs.

ICS-CERT had been coordinating the vulnerability with the security researcher and affected vendor prior to the public release.

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ICS-CERT is aware of additional public reporting of vulnerabilities with PoC exploit code affecting 3S CoDeSys web server. This report includes the buffer overflow previously reported, as well as three additional vulnerabilities. This report was released by Luigi Auriemma without coordination by ICS-CERT, the vendor, or any other coordination entity of which ICS-CERT is aware.

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 cybersecurity attacks.

The reports include vulnerability details and PoC exploit code for the following vulnerabilities:

Vulnerability Type Exploitability Impact
Stack Based Buffer Overflow Remote Denial of Service/Possible Remote Code Execution
Integer overflow Remote Denial of Service
Null pointer (method 1) Remote Denial of Service
Null pointer (method 2) Remote Denial of Service

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

Follow-Up

ICS-CERT released a follow-up advisory, ICSA-12-006-01 - 3S CoDeSys Vulnerabilities, to the ICS-CERT Web page on January 06, 2012.

Mitigations

Mitigation

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

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

The Control Systems Security Program also provides a recommended practices section for controlsystems 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 internalprocedures and report their findings to ICS-CERT for tracking and correlation against other incidents.

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

Vendor

3S-Smart Software Solutions