Multiple Vendor OpenOffice TIFF File Parsing Multiple Integer Overflow
Vulnerabilities

iDefense Security Advisory 09.17.07
http://labs.idefense.com/intelligence/vulnerabilities/
Sep 17, 2007

I. BACKGROUND

OpenOffice is an open-source desktop office suite for many of today's
popular operating systems. Tagged Image File Format (TIFF) is a widely
supported image file format. More information about these technologies
are available from the following URLs.

http://www.openoffice.org/

http://en.wikipedia.org/wiki/Tiff

II. DESCRIPTION

Remote exploitation of multiple integer overflow vulnerabilities within
OpenOffice, as included in various vendors' operating system
distributions, allows attackers to execute arbitrary code.

These vulnerabilities exist within the TIFF parsing code of the
OpenOffice suite. When parsing the TIFF directory entries for certain
tags, the parser uses untrusted values from the file to calculate the
amount of memory to allocate. By providing specially crafted values, an
integer overflow occurs in this calculation. This results in the
allocation of a buffer of insufficient size, which in turn leads to a
heap overflow.

III. ANALYSIS

Exploitation of these vulnerabilities allows an attacker to execute
arbitrary code with the privileges of the user opening the file.

Exploitation requires that an attacker persuade a targeted user into
opening a maliciously crafted document. This could be accomplished by
hosting the document on a web site, sending the document via electronic
mail, or other means.

IV. DETECTION

iDefense has confirmed the existence of these vulnerabilities in
OpenOffice version 2.0.4. All versions prior to version 2.3 are
suspected to be vulnerable.

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 2.3. For more information, consult the OOo Security
Bulletin at the following URL.

http://www.openoffice.org/security/cves/CVE-2007-2834.html

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-2834 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

05/01/2007  Initial vendor notification
06/14/2007  Initial vendor response
09/17/2007  Coordinated public disclosure

IX. CREDIT

The discoverer of these vulnerabilities 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 © 2007 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.