Find Vulnerability in joomla Website

How to Find Vulnerability in 

joomla Website using Backtrack

using Backtrack 5.

Joomla! Vulnerability Scanner.

Joomscan Security Scanner is a vulnerability scanner for the Joomla!
First Open Your backtrack and Follow these path

Applications->Backtrack->Vulnerability Assessment->Web Application assessment->CMS vulnerabilities identification->Joomscan

hackingterritory

Now type ./joomscan.pl -u example.com -x localhost:8080


there it goes, and the local port.