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modelscan-bypass-zipfile

Security Research — Modelscan Bypass PoC

Severity: HIGH

Module: zipfile

Description: Zip file extraction — file write to arbitrary paths

Impact: Open zip archives. extractall() writes files. Zip slip via ../ in filenames.

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 zipfile 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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