What is SHELL and How to use it ?

After getting the admin access in the website attacker will upload his own control penal that’s called shell. It helps attacker to maintain access for the long time. There are many types of shells like DDOSE shell, symlink shell etc.

Using shell attacker can destroy whole database and he can leak the database of the website and using the shell he can root the server. (Only Linux server can be rooted windows server cant be rooted because there is no ROOT :P) After rooting he can destroy whole server. Suppose One server contains 500 websites and attacker got the admin access in the single site and he have rooted that server then 500 sites can be destroyed ! 

USES  OF  SHELL

1. Using shell you can Destroy the INDEX page of the website
2. You can host your files in the server :D
3. You can root the server

Now if you want to destroy the index page of the website then find the “INDEX” page from the list and replace that coding with your own deface page. And using browse option you can host your own file in the server. You can create your own shell and you can add your own tools in your shell. for that you know PHP.

- See more at: http://www.hackforsecurity.net/2012/10/what-is-shell-and-how-to-use-it.html#sthash.LTj6upNM.dpuf