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How Can I Safely Deserialize JSON with TypeNameHandling in C# to Prevent Security Risks?

Barbara Streisand
Release: 2025-01-31 16:21:09
Original
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How Can I Safely Deserialize JSON with TypeNameHandling in C# to Prevent Security Risks?

Typenamehandling: The warning story in JSON's back -sequentialization

In the field of JSON's derivativeization, TypenameHandling play plays a vital role in determining how to explain external JSON data. Although it can automatically create a specific type of instance, it needs to be cautious when dealing with JSON data from the source of trusted sources.

The default setting TypenameHandling.all looks convenient, but it hides the danger. When the JSON data contains type metadata, json.net will try the type specified in the specified type. Although this looks harmless, the malicious code can use this function to create a dangerous object in your application.

Consider this example: indicate JSON data of the CAR object:

Using Typenamehandling.all, json.net will create a new CAR instance and fill in its attributes accordingly. However, the attacker can modify the json structure to represent the system.codedom.compiler.tempFileCollection object:
<code>{
   "$type": "Car",
   "Maker": "Ford",
   "Model": "Explorer"
}</code>
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This malicious JSON will instruct JSON.NET to instantiate an TempfileCollect object, which will delete files on the victim's system without the victim's unknown or unwilling consent.
<code>{
       "$type": "System.CodeDom.Compiler.TempFileCollection",
       "BasePath": "%SYSTEMDRIVE",
       "KeepFiles": "False",
       "TempDir": "%SYSTEMROOT%"
}</code>
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In order to alleviate this vulnerability, when using TypenameHandling.all back serialization JSON, be sure to use a custom SerializationBinder. This binder can perform rigorous verification and inspection to ensure that the types of transmitted before instantiation are safe and allowed. By taking these preventive measures, you can prevent malicious JSON from damaging the integrity of the application.

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