Question: How to extract root password in linux? 

Answer: you could use a root kit (http://en.wikipedia.org/wiki/Rootkit)\nhttp://packetstormsecurity.org/groups/teso/adore-0.14.tar.gz\nadore is a linux LKM based rootkit. Features smart PROMISC flag hiding, persistant file and directory hiding (still hidden after reboot), process-hiding, netstat hiding, rootshell-backdoor, and an uninstall routine. Includes a userspace program to control everything.\n\nor an old school way is to use cracker jack to perform a passwd bruteforce attack on the shadow file (/etc/shadow), but ironically you have to have root access to get that file ;)
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