How to check the security and health of my Joomla installation?
For checking the overall health and security of your Joomla-based website you can use a free extension called
Joomla! Tools Suite. It can be downloaded at:
http://joomlacode.org/gf/project/jts/
With this component you can perform an environment audit of your Joomla, diagnose, report and advise on common installation, health and security issues, including performing several common performance and recovery actions.