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Modelscan Bypass PoC — shutil.which() Executable Discovery

Vulnerability

Modelscan 0.7.6 fails to detect malicious pickle files that use shutil.which for System reconnaissance — discovers installed executables, their paths, and system configuration. Useful for targeted follow-up attacks.

The shutil module is not in modelscan's unsafe_globals blocklist.

Chain

shutil.which(name) — not blocked\n2. Finds executable paths on the system (reconnaissance)

Reproduction

modelscan scan -p pytorch_model.bin
# Result: "No issues found"

python3 -c "import pickle; result = pickle.loads(open('pytorch_model.bin','rb').read()); print(result)"
# Result: Returns path to python3 executable

Impact

System reconnaissance — discovers installed executables, their paths, and system configuration. Useful for targeted follow-up attacks. Severity: MEDIUM.

Modelscan Version

0.7.6 (latest on PyPI as of 2026-04-09)

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