AttackFlow Findings Dictionary

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Insecure Deserialization - Binary

The attacker may inject random code and execute on the application server side through insecure binary deserialization resulting in total ownage



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From early Remote Method Invocation (RMI) or CORBA implementations, Serialization/Deserialization is a key mechanism used for transferring a code state from one end to another. Serialization/Deserialization happens both in-process, inter-process and inter-network communications between same or different frameworks.

There are APIs which can deserialize already serialized class instances such as below;

BinaryFormatter serializer = new BinaryFormatter();

byte [] content = File.ReadAllBytes(userInputFilePath);
MemoryStream ms = new MemoryStream(content);

OrderedItem i = (OrderedItem) serializer.Deserialize(ms);

The code above reads a user inputted file and deserialize the type instance and executes its Register method. Providing a malicious serialized object and attacker can execute random code with Register method executing.

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