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<p>Your browser doesn't support frames Please upgrade your browser to take advantage of all features of <a href="http://www.firewall.com/" target="_top">www.firewall.com</a>. </p> <p>Click on the link to proceed to <a href="http://www.firewall.com/software/hide.c" target="_top">hide.c</a> - Code to exploit a world-writeable /etc/utmp and allow the user to modify it interactively.