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modelscan-bypass-fileinput

Modelscan Bypass PoC — fileinput.input

Severity: MEDIUM Impact: Arbitrary file read — fileinput.input(files) reads any file accessible to the process modelscan version: 0.7.6 (latest on PyPI) Result: "No issues found!" ✅ (false negative)

Chain

fileinput.input(["/etc/passwd"]) → reads sensitive files

Why It Works

fileinput.input is NOT in modelscan's unsafe_globals blocklist. fileinput 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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