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Microsoft Office MSO Size Handling Integer Overflow

Microsoft Office MSO Size Handling Integer Overflow
Posted Apr 14, 2011
Authored by Nicolas Joly, Chaouki Bekrar, VUPEN | Site vupen.com

The VUPEN Vulnerability Research Team discovered a critical vulnerability in Microsoft Office. The vulnerability is caused by an integer overflow error in the MSO component when parsing certain values within an Office document, which could be exploited by attackers to compromise a vulnerable system by tricking a user into opening a malformed Office file (e.g. Word). Microsoft Office XP Service Pack 3 is affected.

tags | advisory, overflow
MD5 | f1627e5afa6438550bbc9e70526c3418

Microsoft Office MSO Size Handling Integer Overflow

Change Mirror Download
VUPEN Security Research - Microsoft Office MSO Size Handling Integer 
Overflow Vulnerability

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


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

"Microsoft Office is a proprietary commercial office suite of inter-related
desktop applications, servers and services for the Microsoft Windows and
Mac OS X" (Wikipedia)


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

VUPEN Vulnerability Research Team discovered a critical vulnerability
in Microsoft Office.

The vulnerability is caused by an integer overflow error in the MSO
component
when parsing certain values within an Office document, which could be
exploited
by attackers to compromise a vulnerable system by tricking a user into
opening
a malformed Office file (e.g. Word).

CVSS Score: 10 (AV:N/AC:L/Au:N/C:C/I:C/A:C) / CVE-2011-0041


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

Microsoft Office XP Service Pack 3


IV. Binary Analysis & Exploits/PoCs
---------------------------------------

In-depth binary analysis of the vulnerability and a proof-of-concept code
are available through the VUPEN Binary Analysis & Exploits Service :

http://www.vupen.com/english/services/ba-index.php


V. VUPEN Threat Protection Program
-----------------------------------

To proactively protect critical networks and infrastructures against
unpatched
vulnerabilities and reduce risks related to zero-day attacks, VUPEN shares
its
vulnerability research with governments and organizations members of the
VUPEN
Threat Protection Program (TPP).

VUPEN TPP customers receive fully detailed and technical reports about
security
vulnerabilities discovered by VUPEN and in advance of their public
disclosure.

http://www.vupen.com/english/services/tpp-index.php


VI. SOLUTION
----------------

Apply the MS11-029 security update.


VII. CREDIT
--------------

This vulnerability was discovered by Nicolas Joly and Chaouki Bekrar of
VUPEN Security


VIII. 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 (VNS) :
http://www.vupen.com/english/services/vns-index.php

* VUPEN Binary Analysis & Exploits Service (BAE) :
http://www.vupen.com/english/services/ba-index.php

* VUPEN Threat Protection Program for Govs (TPP) :
http://www.vupen.com/english/services/tpp-index.php

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


IX. REFERENCES
----------------------

http://www.vupen.com/english/research-vuln.php
http://www.vupen.com/english/advisories/2011/0947
http://www.microsoft.com/technet/security/Bulletin/MS11-029.mspx


X. DISCLOSURE TIMELINE
-----------------------------

2010-05-05 - Vulnerability Discovered by VUPEN
2011-04-12 - MS11-029 security update released

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