Public Vulnerability Reports

Microsoft Word RTF File Parsing Heap Buffer Overflow Vulnerability

08.10.10

BACKGROUND

Microsoft Word is a word processing application from Microsoft Office. For more information about Microsoft Word, see the following website: http://office.microsoft.com/en-us/word/default.aspx

Rich-Text Format (RTF) is a document file format developed by Microsoft for cross-platform document interchange.

DESCRIPTION

Remote exploitation of a heap buffer overflow vulnerability in Microsoft Corp.'s Word could allow attackers to execute arbitrary code under the privileges of the targeted user.

This vulnerability specifically exists in the handling of some drawing object control words in an RTF document. Under certain circumstances, Word will copy a property value into a heap buffer without checking the length, which causes a heap buffer overflow.

ANALYSIS

Exploitation allows remote attackers to execute arbitrary code on the affected host under the context of the user who opened the malicious RTF document with Microsoft Word.

Exploitation might require that the user open a specially crafted RTF document with a vulnerable application. The most likely exploitation vector involves convincing a user to open an RTF document sent to the user via e-mail or linked on a website.

DETECTION

iDefense has confirmed the existence of this vulnerability in Microsoft Word 2003, Microsoft Word 2007, and Microsoft Outlook 2007. A full list of vulnerable Microsoft products can be found in Microsoft Security Bulletin MS10-056.

WORKAROUND

Microsoft suggested workarounds can be found in Microsoft Security Bulletin MS10-056.

VENDOR RESPONSE

Microsoft Corp. has released patches which address this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown. http://www.microsoft.com/technet/security/bulletin/MS10-056.mspx

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-1902 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

08/12/2009 Initial Vendor Notification
08/12/2009 Initial Vendor Reply
08/10/2010 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by wushi of team509.

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LEGAL NOTICES

Copyright © 2010 Verisign, Inc.

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