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ModelScan Bypass PoC — codeop.compile_command

Security research for responsible disclosure via Huntr MFV program.

Vulnerability

codeop.compile_command is not in modelscan's unsafe_globals blocklist. When a pickle file containing this global is scanned by modelscan, it reports "No issues found." However, loading the file with pickle.loads() / torch.load() triggers compiles arbitrary Python code string to code object. Combined with types.FunctionType, achieves full RCE..

Impact

Severity: HIGH
Effect: compiles arbitrary Python code string to code object. Combined with types.FunctionType, achieves full RCE.

Bypass Class

builtins.compile is blocked but codeop.compile_command (which wraps compile()) is not. The returned code object can be wrapped in types.FunctionType(code, {}) to create and execute an arbitrary function.

Reproduction

pip install modelscan
modelscan scan -p bypass_poc.pkl
# Output: "No issues found!"

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