www.siteground.com/joomla-hosting/joomla...ons/ver1.5/jhack.htm
usefull plugin from Siteground:
jHackGuard is designed by SiteGround to protect Joomla websites from hacking attacks. Just add it to your Joomla and it will be safe against SQL Injections, Remote URL/File Inclusions, Remote Code Executions and XSS Based Attacks!
This plugin has been successfully used by SiteGround customers during the past few years. Now we make its latest version public, so that you can easily protect your Joomla site. All you need to do is to install jHackGuard and enable it – no additional configuration needed!
You have to to register to get the free download ...