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Microsoft PowerPoint OEPlaceholderAtom Invalid Array Indexing Vulnerability

02.09.10

BACKGROUND

Microsoft PowerPoint is an application used for constructing presentations, and comes with the Microsoft Office suite. For more information, see the vendor's site found at the following link.

http://office.microsoft.com/en-us/powerpoint/default.aspx

DESCRIPTION

Remote exploitation of an invalid array indexing vulnerability in Microsoft Corp.'s PowerPoint could allow an attacker to execute arbitrary code with the privileges of the current user.

This vulnerability occurs when parsing an "OEPlaceholderAtom" record. This record type is used to create a placeholder for an object (picture, text, etc.) on a slide. By providing a value greater than the size of an array, it is possible to corrupt stack memory beyond the bounds of the array with a fixed value. By overwriting critical structures like the saved return address, it is possible to execute arbitrary code.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user opening the file. To exploit this vulnerability, an attacker needs to convince a user to open a malicious file. If the targeted user is running PowerPoint 2000, and the "Office Document Open Confirmation Tool" is not installed, then it is possible to exploit this vulnerability directly through the browser.

DETECTION

iDefense has confirmed the existence of this vulnerability in the following versions of PowerPoint:

PowerPoint 2000 SP3

PowerPoint 2002 (XP) SP3

PowerPoint 2003 SP3

PowerPoint 2007 and PowerPoint 2007 SP1 are not affected.

WORKAROUND

iDefense is currently unaware of any workarounds for this issue.

VENDOR RESPONSE

Microsoft Corp. has released a patch which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown. http://www.microsoft.com/technet/security/Bulletin/MS10-004.mspx

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-0031 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

07/08/2009 Initial Vendor Notification
07/08/2009 Initial Vendor Reply
02/09/2010 Coordinated Public Disclosure

CREDIT

This vulnerability was discovered by Sean Larsson, iDefense Labs.

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LEGAL NOTICES

Copyright © 2010 Verisign, Inc.

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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.