Message-ID: <4C61CCFB.2020300@idefense.com>
Date: Tue, 10 Aug 2010 18:04:43 -0400
From: iDefense Labs <labs-no-reply@...fense.com>
To: bugtraq@...urityfocus.com, vulnwatch@...nwatch.org,
	full-disclosure@...ts.grok.org.uk
Subject: iDefense Security Advisory 08.10.10: Microsoft Word RTF File Parsing
 Heap Buffer Overflow Vulnerability

iDefense Security Advisory 08.10.10
http://labs.idefense.com/intelligence/vulnerabilities/
Aug 10, 2010

I. 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.

II. 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.

III. 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.

IV. 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.

V. WORKAROUND

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

VI. 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

VII. 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.

VIII. DISCLOSURE TIMELINE

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

IX. CREDIT

This vulnerability was reported to iDefense by wushi of team509.

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X. LEGAL NOTICES

Copyright © 2010 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@...fense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
 There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.

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