It was previously thought that only Windows 2000 machines were vulnerable to remote attack using the plug-and-play flaw. However, Microsoft in its security advisory on Tuesday specified one scenario that also exposes select Windows XP users.

Also vulnerable are systems that run Windows XP with SP1 with file and printer sharing and the Windows guest user account enabled, according to Microsoft. This would likely be home users, because PCs are not vulnerable if connected to a network domain, which is common in business environments, Microsoft said.

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Liam