Information Disclosure in Spring Framework via WebSocket Exception Headers

Executive Summary

A Spring WebFlux application with WebSocket support may leak sensitive user information through exception messages that include request headers during WebSocket handshake failures.

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Detection Guidance

To detect this vulnerability, check if your Spring Framework version falls within the affected ranges (5.2.25.RELEASE and earlier, 5.3.0-5.3.49, 6.0.0-6.0.30, 6.1.0-6.1.28, 6.2.0-6.2.19, or 7.0.0-7.0.8). Inspect WebSocket handshake logs for exception messages containing request headers.

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Impact Analysis

Attackers could access sensitive data such as session tokens or authentication headers if an exception occurs during WebSocket connection setup, potentially leading to unauthorized access or data breaches.

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Compliance Impact

This vulnerability could result in unauthorized exposure of personal data, violating GDPR's data protection principles and HIPAA's safeguards for protected health information, potentially leading to compliance violations and penalties.

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Mitigation Strategies

Upgrade to a fixed version of Spring Framework: 5.2.26, 5.3.50, 6.0.31, 6.1.29, 6.2.20, or 7.0.9 based on your current version. No additional mitigation steps are required beyond applying these updates.

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