Microsoft Excel 2007 SP2; Excel in Office 2007 SP2; Excel Viewer SP2; Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP2; and Excel Services on Office SharePoint Server 2007 SP2 do not properly validate the sign of an unspecified array index, which allows remote attackers to execute arbitrary code via a crafted spreadsheet, aka "Excel Out of Bounds Array Indexing Vulnerability."