Gordon Maddern, a security researcher in Australia, has reported a serious hole in the current Mac version of Skype that could be exploited by an attacker to remotely take control of the computer, CNet says. Skype has since responded saying they had already issued a "hotfix" for the vulnerability but will release a formal update to address it next week, over a month after Maddern reported it to the company. Maddern is not releasing details of the "extremely dangerous" problem until Skype has fixed it, he said.