bugtraq - iDefense Security Advisory 06.13.07: Multiple Vendor libexif Integer Overflow Heap Corruption Vulnerability

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Message-ID: <4670147B.9010602@idefense.com>
Date: Wed, 13 Jun 2007 11:59:55 -0400
From: iDefense Labs <labs-no-reply@...fense.com>
To: vulnwatch@...nwatch.org, full-disclosure@...ts.grok.org.uk,
	bugtraq@...urityfocus.com
Subject: iDefense Security Advisory 06.13.07: Multiple Vendor libexif Integer
 Overflow Heap Corruption Vulnerability

Multiple Vendor libexif Integer Overflow Heap Corruption Vulnerability

iDefense Security Advisory 06.13.07
http://labs.idefense.com/intelligence/vulnerabilities/
Jun 13, 2007

I. BACKGROUND

Exchangeable image file format (Exif) is an industry standard image
tagging technology used by many digital camera devices. libexif is an
open source library for handling the Exif format. More information can
be found at the URLs shown below.

http://en.wikipedia.org/wiki/Exif
http://libexif.sourceforge.net/

II. DESCRIPTION

Remote exploitation of a integer overflow vulnerability in libexif, as
included in various vendors' operating system distributions, could
allow attackers to crash the process or execute arbitrary code.

The problem exists while parsing a tagged image with a large number of
Exif components. Applications using this library are susceptible to a
heap overflow when an integer overflow is triggered in the
exif_data_load_data_entry function.

III. ANALYSIS

Exploitation requires that a targeted user process a malicious image
using one of several available tools that utilize libexif for Exif tag
parsing. These tools include, but are not limited to, several
applications included in the GNOME and KDE desktops.

IV. DETECTION

iDefense confirmed the existence of this vulnerability in versions
0.6.13 through 0.6.15 of libexif.

V. WORKAROUND

iDefense is currently unaware of any workarounds for this issue.

VI. VENDOR RESPONSE

The libexif maintainers have released version 0.6.16 of libexif to
address this vulnerability.

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4168 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

08/16/2006  Initial vendor notification
06/05/2007  Second vendor notification
06/11/2007  Initial vendor response
06/13/2007  Coordinated public disclosure

IX. CREDIT

This vulnerability was discovered by Sean Larsson (iDefense Labs).

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@...fense.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.