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modelscan-bypass-tarfile

Security Research — Modelscan Bypass PoC

Severity: HIGH

Module: tarfile

Description: Tar file extraction — potential path traversal file write

Impact: Open tar archives. Combined with extractall(), enables directory traversal attack writing files to arbitrary paths.

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 tarfile 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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