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Modelscan Bypass PoC: poplib.POP3 SSRF

Security Research — Responsible Disclosure

This model file demonstrates a modelscan bypass using poplib.POP3. The POP3 constructor connects to the specified host immediately on construction, enabling Server-Side Request Forgery (SSRF) attacks.

Vulnerability

Module: poplib.POP3 (Python stdlib)
Type: SSRF (CWE-918)
Impact: Network access to attacker-controlled server on model load
Modelscan result: "No issues found" on both .pkl and pytorch_model.bin

How it works

poplib.POP3(host) connects to the host immediately when the constructor is called. This module is NOT in modelscan's unsafe_globals blocklist, so the pickle passes scanning but executes a network connection when loaded with pickle.load() or torch.load().

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