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Modelscan Bypass PoC — shutil.copy() File Copy

Vulnerability

Modelscan 0.7.6 fails to detect malicious pickle files that use shutil.copy for Arbitrary file copy — can exfiltrate sensitive files (/etc/passwd, SSH keys, configs) or overwrite system files.

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

Chain

shutil.copy(src, dst) — not blocked\n2. Copies any readable file to any writable location

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: Copies /etc/passwd to attacker-controlled path

Impact

Arbitrary file copy — can exfiltrate sensitive files (/etc/passwd, SSH keys, configs) or overwrite system files. Severity: HIGH.

Modelscan Version

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

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