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modelscan-bypass-shelve

Modelscan Bypass PoC — shelve.open

Severity: MEDIUM Impact: Arbitrary file write — shelve.open(filename) creates database files at arbitrary paths modelscan version: 0.7.6 (latest on PyPI) Result: "No issues found!" ✅ (false negative)

Chain

shelve.open("/target/path") → creates .db files at arbitrary path

Why It Works

shelve.open is NOT in modelscan's unsafe_globals blocklist. shelve is NOT in the blocklist. Note: shelve uses pickle internally.

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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