Andrew Brooks identified and reported to The Zero Day Initiative (ZDI) a File Parsing Vulnerability: Schneider Electric StruxureWare SCADA Expert ClearSCADA ServerMain.exe OPF File Parsing Vulnerability. Schneider Electric has prepared workarounds and helped develop security upgrades for a third‑party component that is affected.
The following SCADA Expert ClearSCADA versions are affected:
Successful exploitation of this vulnerability can cause the process to crash, resulting in a denial of service.
Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Schneider Electric corporate headquarters is located in Paris, France, and maintains offices in 190 countries worldwide.
According to Schneider Electric, SCADA Expert ClearSCADA is deployed across several sectors including Commercial Facilities, Energy, and Water and Wastewater Systems.
An input project-file validation vulnerability has been discovered in the KepServerEX V4 component, present within the PLC Driver in versions of SCADA Expert ClearSCADA released prior to January 2014. Kepware has confirmed that this vulnerability is not present in KepServerEX V5.
The PLC Driver is an optional component that requires selection during installation. Most SCADA Expert ClearSCADA users may have installed this component inadvertently during a full installation.
The flawed PLC Driver is located in the ServerMain.exe file, which is part of KepServerEX V4. This product contains several vulnerabilities that will cause the process to crash.
CVE-2014-0779b has been assigned to this vulnerability. ZDI has assessed a CVSS v2 base score of 6.8; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:P).c
This vulnerability is not exploitable remotely.
No known public exploits specifically target this vulnerability.
An attacker with a moderate skill would be able to exploit this vulnerability.
Schneider Electric recommends that customers using the vulnerable product versions to:
Kepware has confirmed this vulnerability is not present in KepServerEX V5.
The security announcement affecting the SCADA Expert ClearSCADA File Parsing Vulnerability is available here:
ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Additional mitigation guidance and recommended practices are publicly available in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B—Targeted Cyber Intrusion Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/).
Organizations observing 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
For industrial control systems cybersecurity information: https://www.us-cert.gov/ics
or incident reporting: https://www.us-cert.gov/report
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