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ModelScan Bypass PoC — _posixsubprocess.fork_exec

Security research for responsible disclosure via Huntr MFV program.

Vulnerability

_posixsubprocess.fork_exec 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 DIRECT fork() + exec() syscall — spawns arbitrary process. subprocess module is blocked but its C implementation _posixsubprocess is NOT..

Impact

Severity: CRITICAL
Effect: DIRECT fork() + exec() syscall — spawns arbitrary process. subprocess module is blocked but its C implementation _posixsubprocess is NOT.

Bypass Class

subprocess is blocked with * wildcard, but _posixsubprocess (the C extension that subprocess uses internally) is not in the blocklist. This function directly calls fork() and execvp() — full arbitrary command execution.

Reproduction

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

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