CVE-2012-0930 in Modicon Quantum PLC
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Schneider Electric Modicon Quantum PLC allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 11/29/2021
The CVE-2012-0930 vulnerability represents a critical cross-site scripting flaw discovered in Schneider Electric Modicon Quantum Programmable Logic Controllers, which are widely deployed in industrial control systems and supervisory control and data acquisition environments. This vulnerability exists within the web-based interface of the Modicon Quantum PLC, creating a significant security risk for industrial networks that rely on these devices for critical operations. The flaw allows remote attackers to inject malicious web scripts or HTML code into the device's web interface, potentially compromising the entire industrial control infrastructure. The vulnerability is particularly concerning because it affects devices that operate in environments where security is paramount, such as power generation, water treatment, and manufacturing facilities. The unspecified vectors indicate that the attack surface may encompass multiple input points within the web interface, making it difficult for administrators to fully understand and protect against all potential exploitation methods. This type of vulnerability directly violates the principle of input validation and demonstrates a fundamental weakness in the device's web application security architecture.
The technical implementation of this XSS vulnerability stems from inadequate sanitization of user-supplied input within the Modicon Quantum PLC web interface. When users interact with the device through web browsers, the system fails to properly validate or escape data entered into form fields, URL parameters, or other input mechanisms. This allows attackers to craft malicious payloads that are executed in the context of other users who view the affected web pages. The vulnerability is classified under CWE-79 as Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly sanitize user input before it is rendered in web applications. The attack vector typically involves an attacker constructing malicious HTML or JavaScript code that gets stored or reflected in the device's web interface, subsequently executing in the browsers of legitimate users who access the affected pages. This creates a persistent threat that can be exploited to steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users within the industrial control environment.
The operational impact of CVE-2012-0930 extends beyond simple web application compromise, as it represents a potential gateway for more sophisticated attacks within industrial control systems. In the context of industrial networks, this vulnerability can enable attackers to gain unauthorized access to critical control functions, potentially leading to operational disruptions, safety hazards, or even physical damage to industrial processes. The Modicon Quantum PLC serves as a foundational component in many industrial environments, making this vulnerability particularly dangerous when considering the potential for lateral movement within networked industrial systems. Attackers could leverage this vulnerability to establish persistent access points, monitor network communications, or manipulate control parameters that affect production processes. The threat landscape for such vulnerabilities aligns with ATT&CK technique T1566 for Phishing and T1071 for Application Layer Protocol, as attackers can use the XSS vulnerability to deliver malicious payloads and establish command and control channels within industrial networks. The impact is compounded by the fact that many industrial environments lack the sophisticated web application security monitoring that would typically detect such attacks in enterprise environments.
Organizations should implement comprehensive mitigation strategies that address both immediate remediation and long-term security enhancements for affected Modicon Quantum PLC devices. The primary mitigation involves applying firmware updates from Schneider Electric that address the XSS vulnerability, though this requires careful planning due to the critical nature of industrial control systems. Network segmentation and access controls should be strengthened to limit exposure of the affected devices to untrusted networks, while implementing web application firewalls specifically designed for industrial environments can provide additional protection. Regular security assessments and vulnerability scanning should be conducted to identify similar vulnerabilities in other industrial control system components, as the Modicon Quantum PLC represents only one potential entry point within complex industrial networks. The vulnerability also highlights the importance of secure coding practices in industrial software development, as evidenced by the CWE-79 classification, and underscores the need for regular security training for industrial control system operators and administrators. Organizations should also consider implementing intrusion detection systems specifically tuned to identify suspicious web-based activity targeting industrial control system interfaces, as the attack patterns associated with such vulnerabilities often differ significantly from traditional enterprise web application threats.