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Modelscan Bypass PoC — plistlib.loads() macOS Plist Deserialization

Vulnerability

Modelscan 0.7.6 fails to detect malicious pickle files that use plistlib.loads for macOS config access — can deserialize plist data. Combined with file read primitives, can access macOS system preferences, app configs, and keychain-adjacent files.

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

Chain

plistlib.loads(data) — not blocked\n2. Deserializes macOS property list data\n3. Combined with io.open, can read system plist configs

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: Deserializes plist XML data

Impact

macOS config access — can deserialize plist data. Combined with file read primitives, can access macOS system preferences, app configs, and keychain-adjacent files. Severity: MEDIUM.

Modelscan Version

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

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