Apache XmlSchema Walker Stack Overflow via Cyclic Schema

Executive Summary

The Apache XmlSchema walker (xmlschema-walker) fails to detect cycles in schema components like type derivation or substitution groups. A malicious schema with such cycles causes the walker to recurse indefinitely until the stack overflows, leading to a denial of service.

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Detection Guidance

This vulnerability can be detected by checking the version of Apache XmlSchema walker in use. If it is below 2.3.3, the system is vulnerable. No specific commands are provided in the context to detect cycles in schemas.

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Impact Analysis

This vulnerability can cause system crashes or unresponsiveness if a malicious schema is processed by the xmlschema-walker. It may disrupt services relying on Apache XmlSchema, especially those parsing untrusted schemas.

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Compliance Impact

This vulnerability causes a denial of service by triggering stack overflows in the xmlschema-walker component. It does not directly impact data privacy or security controls required by standards like GDPR or HIPAA, as it does not lead to unauthorized data access or disclosure.

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Mitigation Strategies

Upgrade Apache XmlSchema walker to version 2.3.3 or later to fix the issue. No other mitigation steps are mentioned in the provided context.

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