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.
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X. LEGAL NOTICES
Copyright © 2007 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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