Microsoft on Tuesday issued alerts on several security flaws in Windows, the most serious of which could allow an attacker to gain control over a victim's computer. Microsoft released six security bulletins as part of its monthly patching cycle, three of which it deems "critical." The Redmond, Wash., software gives that rating to any security issue that could allow a malicious Internet worm to spread without any action required on the part of the user. One bulletin addresses three flaws in Internet Explorer. Of all the issues Microsoft offered fixes for Tuesday, these put users at most risk of attack,...