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iDefense Security Advisory 04.17.08: Multiple Vendor OpenOffice EMF EMR_BITBLT Record Integer Overflow Vulnerability
From: iDefense Labs <labs-no-reply () idefense com>
Date: Thu, 17 Apr 2008 17:59:37 -0400

iDefense Security Advisory 04.17.08
http://labs.idefense.com/intelligence/vulnerabilities/
Apr 17, 2008

I. BACKGROUND

OpenOffice is an open-source desktop office suite for many of today's
popular operating systems. One of the file formats that OpenOffice
supports is Windows Enhanced Metafile (EMF). EMF files are used to
render images. More information is available from the following URL.

http://www.openoffice.org/

II. DESCRIPTION

Remote exploitation of an integer overflow vulnerability in OpenOffice,
as included in various vendors' operating system distributions, allows
attackers to execute arbitrary code with the privileges of the logged
in user.

The vulnerability exists within the code responsible for parsing the
EMR_STRETCHBLT record in an EMF file. This code reads in two 32-bit
integers from the file, and then uses them in an arithmetic operation
that calculates the number of bytes to allocate for a dynamic buffer.
This calculation can overflow, resulting in an insufficiently sized
buffer being allocated. Subsequently, this buffer is overflowed with
data from the file.

III. ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary
code with the privileges of the user opening the file. In order to
exploit this vulnerability, an attacker must persuade a user to open a
malicious file.

IV. DETECTION

iDefense confirmed the existence of this vulnerability in OpenOffice
version 2.3. Other versions may also be affected.

V. WORKAROUND

iDefense is currently unaware of any workarounds for this issue.

VI. VENDOR RESPONSE

The OpenOffice.org team has addressed these vulnerabilities with the
release of version 2.4. For more information, consult the OOo Security
Bulletin at the following URL.

http://www.openoffice.org/security/cves/CVE-2007-5746.html

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-5746 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

10/29/2007  Initial vendor notification
10/30/2007  Initial vendor response
04/17/2008  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2008 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 () idefense 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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