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Date: Wed, 9 Jun 2010 01:31:15 +0200 From: "VUPEN Security Research" <advisories@...en.com> To: <bugtraq@...urityfocus.com> Subject: VUPEN Security Research - Microsoft Office Excel ExternName Buffer Overflow Vulnerability (CVE-2010-1249) 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. * 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-2010-1249 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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