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modelscan-bypass-importlib-subprocess

Security Research — Modelscan Bypass PoC

Severity: CRITICAL

Module: importlib + operator.methodcaller → subprocess

Description: Full RCE via importlib.import_module("subprocess") + operator.methodcaller("getoutput", cmd)

Impact: Command execution via subprocess.getoutput(). Bypasses subprocess.* blocklist entry via importlib indirection.

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 → subprocess 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.

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