WowBB view_user.php SQL Injection Vulnerability

[Megasky <magasky@xxxxxxxxxxx>]

An attacker can exploit this vulnerability to gain admin username and password.

http://www.wowbb.com/

Vulnerable versions: 1.6 
                     1.61
                     1.62

Proof of concept: 
http://www.example.com/wowbb/view_user.php?list=1&letter=&sort_by='[SQL 
Injection]