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Microsoft Corp. is warning computer users that attackers are now exploiting a previously unknown security hole in the company's Excel spreadsheet software to break into vulnerable systems.The vulnerability, which appears to be present in all supported versions of Microsoft Excel and Microsoft Office (including Office 2004 and Office 2008 for Mac), could be exploited merely by convincing a user to open a booby-trapped Excel file hosted on a hacked or malicious Web site, or sent as an attachment in an e-mail message.Microsoft reports that it is "aware only of limited and targeted attacks that attempt to use this vulnerability," and that it is working on shipping a fix for the flaw. Symantec researchers report on the company's blog more or less supporting Microsoft's claim that this flaw is not yet widely being exploited.But that should not deter readers from following this tried-and-true advice: If you didn't ask for it, be very cautious about opening e-mail attachments. If you're not sure whether someone you know meant to send you an attachment, reply back and check with the sender before deciding whether to download and open it.
