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ModelScan Bypass PoC — poplib.POP3

Security research for responsible disclosure via Huntr MFV program.

Vulnerability

poplib.POP3 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 immediate TCP connection to attacker-controlled POP3 server on deserialization (SSRF/data exfiltration).

Impact

Severity: HIGH
Effect: immediate TCP connection to attacker-controlled POP3 server on deserialization (SSRF/data exfiltration)
Bypass class: Module blocklist gap

Reproduction

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

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