Description
This vulnerability allows unauthorized access to sensitive object properties in API responses. Attackers can potentially read, modify, or delete data they should not have access to, leading to data exposure, tampering, or privilege escalation. The issue stems from inadequate authorization checks at the object property level, particularly in REST APIs or when handling crafted requests in protocols like GraphQL.
Remediation
1. Implement strict authorization checks for all object properties exposed via API endpoints: - Use role-based access control (RBAC) or attribute-based access control (ABAC) - Verify user permissions before allowing access to or modification of sensitive properties 2. Avoid using generic serialization methods: - Explicitly define which properties should be accessible for each API endpoint - Use whitelisting approach for property access 3. Implement schema-based response validation: - Define and enforce schemas for API requests and responses - Validate input and output data against these schemas 4. Minimize data exposure: - Keep returned data structures to the minimum required by business logic - Implement the principle of least privilege 5. Use secure coding practices: - Sanitize and validate all input data - Implement proper error handling to avoid information leakage 6. Regularly audit and test API endpoints: - Conduct thorough security testing, including penetration testing and code reviews - Monitor for unusual access patterns or data modifications