7.1

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2025-67747

CVE-2025-67747: Fickling has missing detection for marshal.loads and types.FunctionType in unsafe modules list

Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 are missing marshal and types from the block list of unsafe module imports. Fickling started blocking both modules to address this issue. This allows an attacker to craft a malicious pickle file that can bypass fickling since it misses detections for types.FunctionType and marshal.loads. A user who deserializes such a file, believing it to be safe, would inadvertently execute arbitrary code on their system. This impacts any user or system that uses Fickling to vet pickle files for security issues. The issue was fixed in version 0.1.6.

(GitHub Advisory)

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CVE-2025-67747

CVE-2025-67747:

7.1

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
fickling	pip	< 0.1.6	0.1.6

Technical Details

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Miggo AI

Root Cause Analysis

The vulnerability lies in an incomplete blocklist of unsafe modules within the fickling library. The provided patch from commit 4e34561301bda1450268d1d7b0b2b151de33b913 clearly shows the fix: adding 'marshal' and 'types' to the list of unsafe modules in the unsafe_imports function in fickling/fickle.py. This function is called during the analysis of a pickle file to detect potentially dangerous imports. Before the patch, a pickle file using marshal.loads or types.FunctionType would not be flagged as unsafe, allowing for a bypass of the security checks. The traceback in the vulnerability description confirms that the analysis process involves checking for non-standard imports, which leads to the execution of the vulnerable unsafe_imports function. Therefore, this function is the root cause of the vulnerability.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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