This article talks about Kon-Boot, a tool that can be used for security purposes, such as to legitimately rescue a dead system, or malicious purposes too. Does anyone know another such tool?

In the case of Microsoft Windows and certain Linux distributions, this concern is not just theory. It is also a very concrete reality. Piotr Bania has put together a proof of concept, a boot compromise tool called Kon-Boot, which so far has been tested and confirmed to work on at least four Linux distribution releases and a slew of common MS Windows releases.

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