CVE-2013-0672 in Wincc Tia Portal
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the HMI web application in Siemens WinCC (TIA Portal) 11 allows remote authenticated users to inject arbitrary web script or HTML via unspecified data.
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Analysis
by VulDB Data Team • 01/01/2022
The CVE-2013-0672 vulnerability represents a critical cross-site scripting flaw within Siemens WinCC HMI web application component of the TIA Portal 11 suite. This vulnerability specifically affects the human machine interface web application that enables operators to interact with industrial control systems through web-based interfaces. The flaw exists in how the application processes and handles data inputs from authenticated users, creating a potential pathway for malicious actors to execute arbitrary web scripts or HTML code within the context of other users' sessions. The vulnerability is particularly concerning as it requires only remote authentication to exploit, meaning that an attacker who has gained legitimate access credentials can leverage this weakness to compromise the web interface and potentially escalate their privileges within the industrial control environment.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the HMI web application. When authenticated users submit data through various web forms or interface elements, the application fails to properly sanitize or escape user-supplied content before rendering it back to the browser. This allows maliciously crafted input containing HTML tags or JavaScript code to be executed in the victim's browser context, effectively enabling the attacker to hijack user sessions, steal sensitive information, or manipulate the web interface to perform unauthorized actions. The vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, where applications fail to properly validate or escape user-controllable data before incorporating it into dynamically generated web pages. This weakness creates a persistent threat vector that can be exploited through multiple attack vectors including form submissions, URL parameters, or any other data input mechanisms within the HMI web interface.
The operational impact of this vulnerability extends beyond simple web interface compromise, as it can significantly affect industrial control system security and integrity. In industrial environments where Siemens WinCC systems are deployed for critical infrastructure monitoring and control, an attacker could potentially manipulate the HMI interface to alter operational parameters, hide critical alarms, or inject false data that could lead to incorrect operational decisions. The vulnerability is particularly dangerous in environments where operators rely on the HMI web interface for real-time monitoring and control decisions, as malicious actors could create misleading visual representations of system states or disable critical safety mechanisms. This risk is amplified by the fact that the vulnerability exists within the TIA Portal 11 environment, which serves as a comprehensive integration platform for industrial automation and control systems, potentially allowing attackers to gain deeper insights into the industrial network architecture and operational procedures.
Mitigation strategies for CVE-2013-0672 should focus on both immediate defensive measures and long-term architectural improvements. Organizations should implement comprehensive input validation and output encoding mechanisms to prevent malicious scripts from being executed within the web interface, following secure coding practices that align with industry standards such as those outlined in the OWASP Secure Coding Practices. Network segmentation and access controls should be enhanced to limit the scope of potential exploitation, ensuring that even if an attacker gains access to the web interface, they cannot easily escalate privileges or access critical control functions. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities within the industrial control system environment, with particular attention to the TIA Portal components and their web interface implementations. Additionally, organizations should maintain up-to-date security patches and firmware updates from Siemens, as this vulnerability was addressed in subsequent versions of the WinCC software. The ATT&CK framework categorizes this vulnerability under the T1059.007 technique for Scripting, specifically targeting web-based scripting environments where user input is not properly sanitized, making it a significant concern for industrial cybersecurity programs that must defend against both traditional and industrial-specific attack vectors.