[NT] Microsoft Excel DVAL Heap Corruption Vulnerability

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Microsoft Excel DVAL Heap Corruption Vulnerability


<http://office.microsoft.com/excel/> Microsoft Excel is "the spreadsheet
application that is included with Microsoft Corp's Office productivity
software suite". Remote exploitation of a heap corruption vulnerability in
Microsoft Corp.'s Excel spreadsheet application allows attackers to
execute arbitrary code in the context of the user who started Excel.


Vulnerable Systems:
* Microsoft Excel 2003
* Microsoft Excel 2007

The vulnerability exists in the handling of DVAL records in BIFF8 format
spreadsheet files. When certain fields are set to invalid values, heap
corruption occurs.

Exploitation allows attackers to execute arbitrary code in the context of
the user who started Excel. Exploitation requires that attackers persuade
users to open a maliciously crafted file in Excel.

Disabling support for legacy binary file formats in the registry will
prevent exploitation of this issue. However, this workaround is not
available for all versions of Microsoft Excel.

Vendor response:
Microsoft has officially addressed this vulnerability with Security
Bulletin MS08-014. Previous releases, specifically Office 2007 SP1 and
Office 2003 SP3, included a fix for this issue. For more information,
consult their bulletin at the following URL:

CVE Information:

Disclosure Timeline:
05/09/2007 - Initial vendor notification
05/09/2007 - Initial vendor response
03/11/2008 - Coordinated public disclosure


The information has been provided by iDefense Labs.
The original article can be found at:


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