The most recent bug in Skype is another clue to enterprises that they should steer clear of the VoIP service, research firm Gartner recently warned. Two weeks ago, Skype patched a critical vulnerability that could let an attacker send a file to another user without his or her consent, and potentially obtain access to the recipient’s computer and data. “This vulnerability follows three in 2005 (two high-risk, one low-risk) and highlights the risk of not establishing and implementing an enterprise policy for Skype,” wrote Gartner research director Lawrence Orans in an online research note. “Because the Skype client is a free download…most businesses have no idea how many Skype clients are installed on their systems or how much Skype traffic passes over their networks.” The problem, said Orans, is that Skype doesn’t demand that vulnerable clients be updated, and sans administrative management controls to force this, the VoIP client leaves corporate networks open to attack.