From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Jul 06 2006 - 11:32:12 CDT

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TITLE:
Microsoft Excel Style Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA20268

VERIFY ADVISORY:
http://secunia.com/advisories/20268/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
From remote

SOFTWARE:
Microsoft Office XP
http://secunia.com/product/23/
Microsoft Office 2003 Student and Teacher Edition
http://secunia.com/product/2278/
Microsoft Office 2003 Standard Edition
http://secunia.com/product/2275/
Microsoft Office 2003 Small Business Edition
http://secunia.com/product/2277/
Microsoft Office 2003 Professional Edition
http://secunia.com/product/2276/
Microsoft Office 2000
http://secunia.com/product/24/
Microsoft Excel 2003
http://secunia.com/product/4970/
Microsoft Excel 2002
http://secunia.com/product/4043/
Microsoft Excel 2000
http://secunia.com/product/3054/

DESCRIPTION:
Nanika has reported a vulnerability in Microsoft Excel, which
potentially can be exploited by malicious people to compromise a
user's system.

The vulnerability is caused due to a boundary error when handling
overly long styles. This can be exploited to cause a buffer overflow
by tricking a user into opening a specially crafted spreadsheet.

Successful exploitation may allow execution of arbitrary code, but
requires that the user chooses to repair the document (Excel
2002/2003) or clicks the "Style" option (Excel 2000).

NOTE: The vulnerability only affects certain Asian language versions
(e.g. Chinese) of the product.

SOLUTION:
Do not open untrusted office documents.

PROVIDED AND/OR DISCOVERED BY:
Nanika

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