JSON deserialization with automatic type handling can pose security threats. This article aims to clarify the potential vulnerabilities when using TypeNameHandling with settings set to Auto in Json.Net.
Understanding TypeNameHandling in Json.Net
TypeNameHandling controls how JSON.Net deserializes types with "$type" properties, which specify the fully qualified name of the type to instantiate. When set to Auto, Json.Net attempts to resolve the specified type and construct an instance.
Potential Hazards
Without immediate object or dynamic members in your data model, you may assume protection from deserialization attacks. However, certain scenarios can still introduce risks:
Mitigation Measures
To enhance security, consider the following:
Conclusion
While certain mechanisms in Json.Net help mitigate vulnerabilities, it is crucial to carefully consider the potential risks posed by TypeNameHandling in external JSON deserialization. By following the recommended precautions, such as implementing a custom SerializationBinder and verifying your data model's typing, you can increase the security of your application while utilizing Json.Net's features.
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