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ModelScan Bypass PoC — telnetlib.Telnet

Security research for responsible disclosure via Huntr MFV program.

Vulnerability

telnetlib.Telnet 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/Telnet connection to attacker-controlled server on deserialization (SSRF/RCE via telnet protocol).

Impact

Severity: HIGH
Effect: immediate TCP/Telnet connection to attacker-controlled server on deserialization (SSRF/RCE via telnet protocol)
Bypass class: Module blocklist gap

Reproduction

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

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