alphabot | A node.js app to control the AlphaBot | Runtime Evironment library

I faced the same error recently. Here's how you can fix it

1. Delete the node_modules directory
2. Open PowerShell(not command prompt) and run npm i

If it doesn't work, delete package-lock.json and then try the above steps again.

Ok, right, plain TypeNameHandling.All makes it vulnerable. What about this approach?

TL/DR: In the absence of any obvious object or dynamic members, you may well be safe, but you are not guaranteed to be safe. To further decrease your risk you should follow the recommendations from the Newtonsoft documentation:

TypeNameHandling should be used with caution when your application deserializes JSON from an external source. Incoming types should be validated with a custom SerializationBinder when deserializing with a value other than None.

Full Answer

The attacks described in How to configure Json.NET to create a vulnerable web API, TypeNameHandling caution in Newtonsoft Json and Alvaro Muñoz & Oleksandr Mirosh's blackhat paper all depend on using the TypeNameHandling setting of Json.NET to trick the receiver into constructing an attack gadget - a instance of a type that when constructed, populated or disposed effects an attack on the receiving system.

Json.NET does two things that help protect against such attacks. Firstly, it ignores unknown properties. Thus simply adding an additional, unknown property to a JSON payload whose value contains a "$type" property should do no harm. Secondly, during deserialization of a polymorphic value, when resolving the "$type" property, it checks to see whether the resolved type is compatible with the expected type in JsonSerializerInternalReader.ResolveTypeName():