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iDefense Security Advisory 03.11.08: Microsoft Excel DVAL Heap Corruption Vulnerability
iDefense Security Advisory 03.11.08
Mar 11, 2008
Microsoft Excel is the spreadsheet application that is included with
Microsoft Corp's Office productivity software suite. More information
is available at the following website.
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.
The vulnerability exists in the handling of DVAL records in BIFF8 format
spreadsheet files. When certain fields are set to invalid values, heap
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.
iDefense has confirmed the existence of this vulnerability in Microsoft
Excel 2003 and Excel 2007. Previous versions may also be affected.
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.
VI. 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.
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2008-0111 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
05/09/2007 Initial vendor notification
05/09/2007 Initial vendor response
03/11/2008 Coordinated public disclosure
This vulnerability was discovered by Greg MacManus, iDefense Labs.
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X. LEGAL NOTICES
Copyright © 2008 iDefense, Inc.
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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.