Recently, Gumtree, a site offering classified ads and with a large community around it, has been affected by a rogue ad that contained potentially malicious software.Upon trying to access the website, users would be warned by the defense mechanisms in the web browser that the page contained malware. Worry that the website suffered a security breach soon spread on Facebook.According to the site representatives, the risk did not come from Gumtree and the customer data was not compromised, becaus…