Sam Costello and Jennifer DiSabatino

Microsoft Corp. disclosed in May that an "extremely serious" flaw in an extension included in Windows 2000 could allow a malicious hacker to gain complete control of any computer running the Internet Information Services (IIS) 5.0 software built into that operating system.

Microsoft Corp. disclosed today that an "extremely serious" flaw in an extension included in Windows 2000 could allow a malicious hacker to gain complete control of any computer running the Internet Information Services (IIS) 5.0 software built into that operating system.