Deserialization of untrusted data using dill

Description

The application uses `dill` which is vulnerable to deserialization attacks. Deserialization attacks exploit the process of reading serialized data and turning it back into an object. By constructing malicious objects and serializing them, an adversary may attempt to inject code that is executed upon object construction or exploit mass assignment.

Examples

Insecure Code

import dill; dill.loads(b'R\x80\x03cdill.dill\x90.', fix_imports=True, ignore=True)

Secure Code

import json; user_object = json.loads('{"name": "test user"}'); user_object['is_admin'] = False

Remediation

Consider safer alternatives such as serializing data in the JSON format. Ensure any format chosen allows the application to specify exactly which object types are allowed to be deserialized. To protect against mass assignment, only allow deserialization of the specific fields that are required.

Rule Details

Field	Value
ID	CODE-0136
Category	Deserialization
Severity	HIGH
CWE	CWE-502
Confidence	HIGH
Impact	HIGH
Likelihood	MEDIUM
Exploitability	MODERATE
Tags	deserialization, insecure deserialization
OWASP	A8:2017-Insecure Deserialization, A08:2021-Software and Data Integrity Failures

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