Swagger UI API Definition Override in WSO2 API Manager

Executive Summary

The Swagger UI Try-out console in the API Publisher documentation allows loading an external Swagger API definition URL, which replaces the existing API definitions in the Publisher portal. Attackers can exploit this to trick users into interacting with malicious API definitions, potentially exposing sensitive data or triggering unintended backend requests.

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Detection Guidance

This vulnerability involves the Swagger UI Try-out console in the API Publisher documentation loading external Swagger API definitions. To detect it, inspect network traffic for unexpected API definition loads or unauthorized modifications to API endpoints. Check server logs for unusual requests to the Swagger UI console or API Publisher portal.

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Impact Analysis

This vulnerability could lead to sensitive information exposure or unauthorized actions on backend services if users interact with the malicious API definitions. It may also result in data breaches or service disruptions depending on the API's functionality.

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Compliance Impact

This vulnerability could lead to exposure of sensitive information or unintended requests to backend services, which may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data privacy). Unauthorized access or data leaks could result in regulatory penalties or breaches of confidentiality.

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Mitigation Strategies

Disable the Swagger UI Try-out console in the API Publisher documentation to prevent external API definition URLs from being loaded. Review API definitions for unauthorized changes and restrict access to sensitive backend services.

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