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iDefense Security Advisory 04.17.08: Multiple Vendor OpenOffice QPRO File Parsing Integer Underflow Vulnerability
From: iDefense Labs <labs-no-reply () idefense com>
Date: Thu, 17 Apr 2008 18:00:19 -0400

iDefense Security Advisory 04.17.08
Apr 17, 2008


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 Quattro Pro (QPRO). This format is used by Corel's
QuattroPro spreadsheet application. More information is available from
the following URL.



Remote exploitation of an integer underflow 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 converting the
QPRO file into an internal representation used by OpenOffice. A 16-bit
integer is read in from the file, and later used as a loop counter that
controls how many values are stored into local stack buffers. When
verifying the value of this counter, the code decrements the counter
without checking to see if this operation will underflow. This results
in the loop running for many iterations, which leads to a stack based
buffer overflow. This allows for the execution of arbitrary code.


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.


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


Renaming the shared library that contains the vulnerable code will
prevent OpenOffice from opening QPRO files. On Fedora Core 7, the
library can be found at:


Renaming this file to libsc680li.so.bak will prevent it from being
loaded. In addition to preventing the use of QPRO files, this also
prevents users from opening various other file formats.


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



The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-5747 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.


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


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2008 iDefense, 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.

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