CVE-2011-3330 in Telemecanique Driver Pack
Summary
by MITRE
Buffer overflow in the UnitelWay Windows Device Driver, as used in Schneider Electric Unity Pro 6 and earlier, OPC Factory Server 3.34, Vijeo Citect 7.20 and earlier, Telemecanique Driver Pack 2.6 and earlier, Monitor Pro 7.6 and earlier, and PL7 Pro 4.5 and earlier, allows local users, and possibly remote attackers, to execute arbitrary code via an unspecified system parameter.
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Analysis
by VulDB Data Team • 01/09/2025
The vulnerability described in CVE-2011-3330 represents a critical buffer overflow flaw within the UnitelWay Windows Device Driver component that affected multiple industrial automation and SCADA systems from Schneider Electric. This vulnerability exists in several widely deployed software products including Unity Pro 6 and earlier versions, OPC Factory Server 3.34, Vijeo Citect 7.20 and earlier, Telemecanique Driver Pack 2.6 and earlier, Monitor Pro 7.6 and earlier, and PL7 Pro 4.5 and earlier. The affected systems are commonly used in critical infrastructure environments where industrial control systems and supervisory control and data acquisition platforms operate. The buffer overflow occurs within the device driver's handling of system parameters, creating a potential execution path for malicious code injection.
The technical nature of this vulnerability stems from improper bounds checking within the UnitelWay Windows Device Driver implementation. When the driver processes unspecified system parameters, it fails to validate the length or content of input data, allowing an attacker to provide excessive data that overflows allocated memory buffers. This classic buffer overflow condition can be exploited to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling arbitrary code execution. The vulnerability's classification as potentially accessible to remote attackers indicates that the exploitation vector may not be limited to local system access, extending the threat surface to network-based attacks. This characteristic significantly increases the severity and potential impact of the vulnerability.
The operational impact of CVE-2011-3330 is particularly severe given the industrial control systems that are affected. These systems typically operate in environments where continuous operation is critical, such as power generation, water treatment, manufacturing processes, and other critical infrastructure sectors. A successful exploitation could result in complete system compromise, leading to unauthorized access to industrial processes, data manipulation, or system disruption that could have cascading effects throughout critical infrastructure operations. The vulnerability affects multiple Schneider Electric products that are commonly deployed across various industrial environments, amplifying the potential scope of impact. Organizations using these legacy systems face significant risk as the vulnerability may have remained undetected for extended periods due to the specialized nature of industrial environments and limited security monitoring.
Mitigation strategies for this vulnerability should encompass multiple layers of defense given the critical nature of the affected systems. Organizations should prioritize applying available vendor patches and updates from Schneider Electric as soon as they become available, though the age of these affected products may limit patch availability. Network segmentation and access controls should be implemented to restrict access to these systems, particularly limiting direct network access to industrial control systems. The principle of least privilege should be enforced, ensuring that only authorized personnel have access to these systems. Monitoring for unusual system behavior and implementing intrusion detection systems specifically designed for industrial environments can help identify potential exploitation attempts. Additionally, organizations should conduct thorough vulnerability assessments and consider implementing industrial cybersecurity frameworks such as those recommended by NIST or IEC 62443 standards. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and could potentially map to ATT&CK techniques involving privilege escalation and execution of malicious code within industrial control environments.