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CVE-2021-32471 describes insufficient input validation in the Marvin Minsky 1967 implementation of the Universal Turing Machine, which allows users to execute arbitrary code by providing crafted input data. Specifically, the vulnerability arises when the tape head can be manipulated to an unexpected location after processing input composed of non-standard symbols (such as As and Bs instead of 0s and 1s).
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This repository implements a Universal Turing Machine (UTM) as described in Minsky's 1967 work, with a focus on demonstrating a theoretical vulnerability (CVE-2021-32471) that allows for arbitrary code execution within the simulated environment. The main entry point is 'minskys_turing_machine.py', which runs the UTM with user-supplied or default arguments. The default tape input is a crafted exploit that triggers the vulnerability. The core logic and UTM implementation reside in 'minskys_turing_machine_lib.py'. The 'test_minsky.py' file provides automated tests to explore the exploit's effectiveness under various configurations. The README provides detailed background, usage instructions, and references to academic and visual resources. The exploit is a proof-of-concept demonstrating the intrinsic vulnerability in the UTM model, rather than targeting a real-world software product. No network or system endpoints are targeted; the attack vector is local, requiring the user to run the Python code with malicious input. The repository is structured for research and educational purposes, illustrating a fundamental property of Turing-complete systems.
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