Deserialization of Untrusted Data Affecting picklescan package, versions [,0.0.33)

picklescan is a Security scanner detecting Python Pickle files performing suspicious actions

Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the scanner.py deserialization scanning logic. An attacker can achieve remote code execution by crafting a malicious pickle whose __reduce__ method returns the NumPy F2PY gadget numpy.f2py.crackfortran._eval_length with attacker-controlled arguments, allowing the payload to bypass picklescan’s blocklist/allowlist checks and be incorrectly classified as safe.

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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