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source: http://www.securityfocus.com/bid/36523/info Xen is prone to a local authentication-bypass vulnerability. A local attacker with physical access to an affected host can exploit this issue to bypass authentication and modify the 'grub.conf' file. This may aid in a complete compromise of the affected system. Xen 3.0.3, 3.3.0, and 3.3.1 are affected; other versions may also be vulnerable. xm create -c guest press space bar to stop the grub count down press e to edit select the kernel line and press e Append a "1" to the end of the kernel line and press return press "b" to boot