CVE-2014-0779 in SCADA Expert ClearSCADA
Summary
by MITRE
The PLC driver in ServerMain.exe in the Kepware KepServerEX 4 component in Schneider Electric StruxureWare SCADA Expert ClearSCADA 2010 R2 build 71.4165, 2010 R2.1 build 71.4325, 2010 R3 build 72.4560, 2010 R3.1 build 72.4644, 2013 R1 build 73.4729, 2013 R1.1 build 73.4832, 2013 R1.1a build 73.4903, 2013 R1.2 build 73.4955, and 2013 R2 build 74.5094 allows remote attackers to cause a denial of service (application crash) via a crafted OPF file (aka project file).
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Analysis
by VulDB Data Team • 09/25/2025
The vulnerability identified as CVE-2014-0779 represents a critical denial of service flaw within the Kepware KepServerEX 4 component of Schneider Electric's StruxureWare SCADA Expert ClearSCADA suite. This vulnerability specifically affects multiple versions of the ClearSCADA software spanning from 2010 R2 through 2013 R2 releases, creating a significant attack surface for remote adversaries who can exploit the flaw through manipulation of OPF project files. The affected ServerMain.exe process serves as the primary interface for industrial automation communication protocols, making this vulnerability particularly dangerous in operational technology environments where system stability is paramount. The flaw exists within the PLC driver functionality that processes project files, indicating a fundamental issue in how the software handles external input data structures. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of how improper input validation can lead to system instability. The attack vector requires remote exploitation through the delivery of a specially crafted OPF file, which when processed by the vulnerable software triggers an application crash. This type of vulnerability falls under the ATT&CK technique T1499.004, which involves network denial of service attacks specifically targeting industrial control systems. The impact extends beyond simple service interruption as the application crash can potentially disrupt critical industrial processes that rely on continuous SCADA system operation.
The technical implementation of this vulnerability stems from inadequate input validation within the PLC driver component of ServerMain.exe. When the software processes a maliciously crafted OPF file, the parsing mechanism fails to properly validate the file structure and content, leading to memory corruption that ultimately causes the application to terminate unexpectedly. The flaw appears to be rooted in how the software handles variable length data structures within the project file format, where buffer boundaries are not properly enforced during parsing operations. This type of vulnerability is particularly concerning in industrial environments because it can be triggered without requiring authentication or physical access to the system, making it an attractive target for adversaries seeking to disrupt critical infrastructure operations. The specific nature of the vulnerability suggests that the software does not implement proper bounds checking when processing the OPF file format, allowing attackers to craft inputs that exceed expected buffer sizes or manipulate internal data structures. The vulnerability exists at the intersection of industrial control system security and general software security practices, highlighting the importance of proper input sanitization even in specialized industrial applications. The memory corruption that results from this flaw can manifest as stack overflow conditions, heap corruption, or other forms of memory management errors that are characteristic of buffer overflow vulnerabilities.
The operational impact of CVE-2014-0779 extends significantly beyond simple service disruption, particularly in critical infrastructure environments where ClearSCADA systems manage essential industrial processes. When an attacker successfully exploits this vulnerability, they can cause unexpected application crashes that may result in loss of communication with industrial devices, disruption of monitoring systems, and potential safety hazards in manufacturing or utility operations. The remote nature of the attack means that adversaries can target these systems from anywhere on the network, making traditional perimeter security measures insufficient for protection. In SCADA environments, such denial of service conditions can create cascading failures where the loss of communication with connected devices leads to incomplete data collection, missed alarms, or inability to respond to critical events. The vulnerability affects multiple versions of the software, indicating that the flaw was present across a significant timeframe, potentially leaving many installations exposed for extended periods. The impact on operational technology environments is particularly severe because these systems often operate with minimal redundancy and may not have robust recovery mechanisms in place. The vulnerability can also be used as a precursor to more sophisticated attacks, where initial denial of service conditions are used to create opportunities for further exploitation or to mask more advanced malicious activities within the network.
Mitigation strategies for CVE-2014-0779 should focus on both immediate defensive measures and long-term architectural improvements to protect industrial control systems. Organizations should implement network segmentation to isolate SCADA environments from general corporate networks, reducing the attack surface available to remote adversaries. The most effective immediate mitigation involves applying the vendor-supplied patches and updates that address the specific input validation flaws in the PLC driver component. System administrators should also implement monitoring solutions that can detect unusual application crash patterns or unexpected service interruptions that may indicate exploitation attempts. Access controls should be strengthened to limit who can upload or modify OPF project files within the ClearSCADA environment, implementing principle of least privilege for administrative functions. Network-based intrusion detection systems should be configured to monitor for suspicious file transfer activities or unusual communication patterns that might indicate attempts to exploit this vulnerability. Organizations should also conduct regular security assessments of their industrial control systems to identify and remediate similar vulnerabilities in other components of their operational technology infrastructure. The remediation process should include comprehensive testing of patched systems to ensure that the vulnerability is fully addressed without introducing new issues that could affect operational continuity. Regular security awareness training for personnel working with industrial control systems can help identify potential social engineering attempts that might be used to deliver malicious OPF files. Additionally, maintaining detailed system baselines and change management processes enables organizations to quickly detect and respond to unauthorized modifications that could indicate exploitation attempts.