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modelscan-bypass-wave

Modelscan Bypass PoC — wave.open

Severity: MEDIUM Impact: Arbitrary file write — wave.open(path, "wb") creates/overwrites files on disk modelscan version: 0.7.6 (latest on PyPI) Result: "No issues found!" ✅ (false negative)

Chain

wave.open("/target/path", "wb") → creates file at arbitrary path

Why It Works

wave.open is NOT in modelscan's unsafe_globals blocklist. wave is NOT in the blocklist.

Reproduction

pip install modelscan
modelscan scan -p bypass_poc.pkl
# Output: "No issues found!"
python3 -c "import pickle; pickle.loads(open('bypass_poc.pkl','rb').read())"
# Executes arbitrary code

Responsible Disclosure

This PoC is part of a responsible disclosure to ProtectAI via Huntr MFV program.

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