  The universal Turing machine is generally considered to be the simplest, most
abstract model of a computer. This paper reports on the discovery of an
accidental arbitrary code execution vulnerability in Marvin Minsky's 1967
implementation of the universal Turing machine. By submitting crafted data, the
machine may be coerced into executing user-provided code. The article presents
the discovered vulnerability in detail and discusses its potential
implications. To the best of our knowledge, an arbitrary code execution
vulnerability has not previously been reported for such a simple system.
