[Skunkworks] Linux Vulnerability or What Went Wrong?

I've used Ubuntu Linux for a while now, virus free as per the reputation. However, something strange happened; while working I realize that PHP and HTML files have been altered, with a new 'iframe' html tag with a malicious site as the src. ALL the files in the public directory. I experienced this in windows long time ago; it's a fujack. On the other hand: settling in a new office and the internet service is yet to conclude their work. The place has several wireless networks. I tried to explore with a free one; and I'm beggining to realize that doing this was probably suicide. What could have happened to the maverick? It was really humiliating... -- Samuel Waithaka http://www.linkedin.com/in/waithaka http://twitter.com/samwaithaka