Microsoft Excel Invalid Object Reference Vulnerability


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Microsoft Excel Invalid Object Reference Vulnerability

2009-02-24 Extremely critical

Software: Microsoft Excel 2000

Microsoft Excel 2002

Microsoft Excel 2003

Microsoft Office 2000

Microsoft Office 2003 Professional Edition

Microsoft Office 2003 Small Business Edition

Microsoft Office 2003 Standard Edition

Microsoft Office 2003 Student and Teacher Edition

Microsoft Office 2004 for Mac

Microsoft Office 2007

Microsoft Office 2008 for Mac

Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats

Microsoft Office Excel 2007

Microsoft Office Excel Viewer 2003

Microsoft Office Excel Viewer 2007

Microsoft Office XP Description:

A vulnerability has been reported in Microsoft Excel, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error that may cause an invalid object to be referenced when opening an Excel document.

Successful exploitation allows execution of arbitrary code.

NOTE: According to Microsoft, the vulnerability is currently being actively exploited. Secunia Advisories ... http://secunia.com/advisories/33954/

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and also read the following ...........

Hackers Exploit Excel 'Zero-Day' Flaw

Gregg Keizer, Computerworld

Tuesday, February 24, 2009 1:38 PM PST

For the second time in the past five days, security researchers are warning that hackers are exploiting a critical unpatched vulnerability in widely-used software.

Attackers are exploiting a "zero-day," or unfixed, flaw in Microsoft Corp.'s popular Excel spreadsheet, using the bug to hijack select systems in Asia, many of them in government offices and high-profile corporations, said Vincent Weafer, vice president of Symantec Corp.'s security response group.

Hackers have been using another unpatched vulnerability in Adobe Reader for several weeks in a similar fashion, although now that the exploit code has gone public, experts expect to see attacks quickly increase.

The newest vulnerability, which is in all supported versions of Excel, including the latest -- Excel in Office 2007 on Windows and in Office 2008 for the Mac -- is in the program's file format, said Weafer.

PC World story: http://www.pcworld.com/businesscenter/arti...roday_flaw.html

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