metadata
license: mit
tags:
- security-research
- modelscan-bypass
modelscan-bypass-importlib-shutil
Security Research — Modelscan Bypass PoC
Severity: HIGH
Module: importlib + operator.methodcaller → shutil
Description: File operations via importlib.import_module("shutil") + methodcaller
Impact: Bypasses shutil.* blocklist. Can copy/move/delete files. shutil.rmtree for recursive deletion.
Modelscan Result
$ modelscan scan -p pytorch_model.bin
No issues found! ✅ (FALSE NEGATIVE)
Tested against: modelscan 0.8.8 (latest)
How It Works
The pickle file uses importlib + operator.methodcaller → shutil which is NOT in modelscan's unsafe_globals blocklist.
When loaded via torch.load() or pickle.loads(), it executes the payload.
Responsible Disclosure
This PoC is part of responsible security research submitted via Huntr MFV program to help ProtectAI improve modelscan's detection capabilities.