F-Secure Finds Exploits At Social Networking Sites

Web Application Worms exploit persistent Cross Site Scripting (XSS) vulnerabilities in websites. It's a new category of malware and it's a growing concern for popular websites. Social Networking sites seem to be the most popular target as of now. MySpace has already been hit by two such worms - the Samy worm in October last year and last week's Flash worm. Samy was written by a guy who wanted to become popular on MySpace. So he designed the worm to crawl through the site while furiously adding people to his friends list. The result: over a million "friends" in a couple of hours. Last week's worm exploited a vulnerability in Macromedia Flash to redirect MySpace users to an objectionable webpage.

Source: F-secure Blog