Backdoor entry as Root

The login into Run level 1,is by default the the ROOT login that is granted to the user,even without any password.Any unauthorised person can boot the system in RL 1 and just gain control of your system.
But don't take this as a hole,the security is just one file and couple of clicks away.All is needed is editing 'inittab' file present under /etc.And add a special line in there.

In steps it will be :
1. Be the root user.
2. Open the file in vi editor
vi /etc/inittab
3. Enter the 'Insert' mode,by pressing Insert button.
4. Append the line at last of the file
su:S:wait:/sbin/sulogin
5. Save the file and exit.

The back-door is now secured by the root password.

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