VUPEN Security Research - Microsoft Office Excel RTD Stack Overflow 
Vulnerability (CVE-2010-1246)

http://www.vupen.com/english/research.php


I. BACKGROUND
---------------------

"Microsoft Office Excel is a powerful tool you can use to create and
format spreadsheets, and analyze and share information to make more
informed decisions. With the Microsoft Office Fluent user interface,
rich data visualization, and PivotTable views, professional-looking
charts are easier to create and use." (microsoft.com)


II. DESCRIPTION
---------------------

VUPEN Vulnerability Research Team discovered a critical vulnerability
affecting Microsoft Office Excel.

The vulnerability is caused by a stack overflow error when processing
malformed RTD (recType 0x813) records, which could be exploited by
attackers to execute arbitrary code by tricking a user into opening
a specially crafted Excel document.


III. AFFECTED PRODUCTS
---------------------------

Microsoft Office Excel 2002 Service Pack 3


IV. Binary Analysis & Proof-of-concept
---------------------------------------

In-depth binary analysis of the vulnerability and a code execution exploit
have been published by VUPEN through the VUPEN Binary Analysis & Exploits
portal :

http://www.vupen.com/exploits/


V. SOLUTION
----------------

Apply MS10-038 security update:
http://www.microsoft.com/technet/security/bulletin/ms10-038.mspx


VI. CREDIT
--------------

The vulnerability was discovered by Nicolas Joly of VUPEN Security


VII. ABOUT VUPEN Security
---------------------------

VUPEN is a leading IT security research company providing vulnerability
management and security intelligence solutions which enable enterprises
and institutions to eliminate vulnerabilities before they can be exploited,
ensure security policy compliance and meaningfully measure and manage risks.

Governmental and federal agencies, and global enterprises in the financial
services, insurance, manufacturing and technology industries rely on VUPEN
to improve their security, prioritize resources, cut time and costs, and
stay ahead of the latest threats.

* VUPEN Vulnerability Notification Service:
http://www.vupen.com/english/services/

* VUPEN Binary Analysis & Exploits Service :
http://www.vupen.com/exploits/

* VUPEN Web Application Security Scanner (WASS):
http://www.vupen.com/english/wass/


VIII. REFERENCES
----------------------

http://www.vupen.com/english/advisories/2010/1395
http://www.microsoft.com/technet/security/bulletin/ms10-038.mspx
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-1246


IX. DISCLOSURE TIMELINE
-----------------------------

2009-12-03 - Vendor notified
2009-12-03 - Vendor response
2009-12-23 - Status update received
2010-02-19 - Status update received
2010-04-27 - Status update received
2010-06-08 - Coordinated public Disclosure