LINUX Password Cracking

By this article “back|track 2 VS back|track 4” I wanna show ya nothing perfect in this world,
Or in other word nothing safer enough from cracker like you even linux or in this case even back|track. I’ll show ya the way to crack linux local password.

In this odd case I made a freakin’ scenario, but the focus is we’ll crack back|track 4 local password by using back|track 2. Yeah.. brotherhood fighting.
Hmm.. you may think I’m crazy.

First, boot victim computer from back|track 2 live-CD. While you waiting back|track 2 booted, let me share some information.
FYI. In linux all information about user and password stored in /etc/passwd and /etc/shadow (in Windows stored in /WINDOWS/system32/config) so we “just” need to modify this passwd and shadow file to reak trough to the system.

OK back|track 2 has booted perfectly.



Then we need to back-up passwd and shadow file, so we can restore them when we finish doing our “job” :D.

bt ~ # cd /mnt/sda3/etc

Let’s take a look at this shadow file :


Then make backup:

bt etc # cp shadow shadow_backup
bt etc # cp passwd passwd_backup

OK we’ll remount back|track 4 partition to our directory in back|track 2.
Here I made directory /mnt/bt4.

bt ~ # cd ~
bt ~ # mkdir /mnt/bt4
bt ~ # umount /dev/sda3
bt ~ # mount /dev/sda3 /mnt/bt4

Then we’ll change root directory to a new directory by using the command chroot new_directory [command]. If we don’t add [command], it will set as default: /bin/bash.

bt ~ # mkdir /mnt/bt4
bt ~ # chroot /mnt/bt4

at this rate we nearly to the final step. Next we just need to change user password, so run the command:

bt ~ # passwd [username korban]


Here’s our complete step screen shoot:



Open another terminal and reboot your computer..
login with new password that you make.

Fin.

Categories: hacking , tutorial