Computer vandals have been exploiting a flaw in Microsoft's Windows 2000 operating system even before the software giant warned people of its existence. A server operated by the US Army has already been attacked via the security hole. If successfully exploited the loophole can give attackers control over a target machine. In an advisory, Microsoft called the flaw "critical" and has been telling customers to patch their computers in case they fall victim. http://news.bbc.co.uk/1/hi/technology/2860189.stm
