Cross-Site Scripting in Siemens SIMATIC WinCC

Executive Summary

This vulnerability involves affected Siemens devices failing to properly sanitize signal data in imported calculated signal files before displaying it on the Trace page. An attacker could trick an authorized user with 'Read diagnostics' rights into importing a malicious file, leading to attacker-controlled JavaScript execution in the user's browser session. This could allow the attacker to perform PLC operations within the user's authorized scope.

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Detection Guidance

This vulnerability involves improper sanitization of signal data in imported files, leading to potential JavaScript execution. Detection requires monitoring for suspicious file imports and unauthorized browser activity. No specific commands are provided in the context.

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Impact Analysis

The impact includes potential unauthorized execution of PLC operations through the web server, which could disrupt industrial processes or cause equipment malfunctions. Attackers might gain control over critical systems within the user's authorization scope, leading to operational disruptions or safety hazards in industrial environments.

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Compliance Impact

The vulnerability could allow unauthorized execution of JavaScript in a user's browser session, potentially leading to unauthorized access to sensitive data or system operations. This may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data security) by enabling unauthorized data access or modification.

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Mitigation Strategies

Restrict user permissions to minimize the impact of potential exploitation. Ensure only authorized users with the 'Read diagnostics' function right can import calculated signal files. Regularly update and patch affected Siemens SIMATIC devices to the latest firmware versions.

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