Microsoft posted a security advisory warning of a vulnerability in several versions of Microsoft Office Excel that affects both Windows and Mac OS users.
The affected versions include Microsoft Office Excel 2003 Service Pack 2, Excel Viewer 2003, Excel 2002, Excel 2000, and Excel 2004 for Mac.
The attack relies on a maliciously crafted Excel file that contains malformed header information. Attempting to open the file, either through a Web browser or as an e-mail attachment, can corrupt system memory, which could give an attacker the opportunity to execute remote code on the victim's system or to obtain elevated user privileges.
Microsoft said it is working on a fix that will be released either as part of its regular patch schedule or in an out-of-band release.
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