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HistoryJun 14, 2010 - 12:00 a.m.

VUPEN Security Research - Microsoft Office Excel ExternName Buffer Overflow Vulnerability (CVE-2010-1249)

2010-06-1400:00:00
vulners.com
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VUPEN Security Research - Microsoft Office Excel ExternName Buffer Overflow
Vulnerability (CVE-2010-1249)

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 buffer overflow error when processing
malformed ExternName (recType 0x23) 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
Microsoft Office 2004 for Mac
Microsoft Office 2008 for Mac
Open XML File Format Converter for Mac

IV. Binary Analysis & Proof-of-concept

In-depth binary analysis of the vulnerability and a proof-of-concept
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.

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-2010-1249

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

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