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ICS-CERT is aware of a public report of Structured Exception Handler (SEH) overwrite vulnerability with proof-of-concept (PoC) exploit code affecting Sielco Sistemi WinLog Lite SCADA HMI, a supervisory control and data acquisition/human-machine interface (SCADA/HMI) product. According to this report, the vulnerability is exploitable by overwriting the SEH to allow insertion and execution of shell-code. This report was released by independent security researcher “FaryadR” (a.k.a. Ciph3r) on the Web site packetstormsecurity.org 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.
|Vulnerability Type||Remotely Exploitable||Impact|
|Structured Exception Handler||No||Possible Code Execution|
Please report any issues affecting control systems in critical infrastructure environments to ICS-CERT.
Sielco Sistemi--WinLog Lite SCADA HMI, ver. 2.06.17
Sielco Sistemi is based in Italy with numerous sales and support offices worldwide providing multiple SCADA/HMI solutions.
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 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.
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.
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.
- a. ICS-CERT ALERT, http://ics-cert.us-cert.gov/alerts/ICS-ALERT-10-301-01, Web site last accessed October 3, 2012.
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