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AUSCERT External Security Bulletin Redistribution
ESB-2010.0579
Multiple Vendor LibTIFF 3.9.2 Stack Buffer Overflow Vulnerability
29 June 2010
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AusCERT Security Bulletin Summary
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Product: libTIFF
Publisher: iDEFENSE
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2010-2067
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iDefense Security Advisory 06.21.10
http://labs.idefense.com/intelligence/vulnerabilities/
Jun 21, 2010
I. BACKGROUND
libTIFF is a free and popular image library that provides support for
displaying and manipulating Tag Image File Format (TIFF) image data.
This library is used by numerous applications and is included in
various vendor operating system distributions. For more information,
see the vendor's site found at the following link:
http://www.libtiff.org
II. DESCRIPTION
Remote exploitation of a stack buffer overflow vulnerability in version
3.9.2 of LibTIFF, as included in various vendors' operating system
distributions, could allow an attacker to execute arbitrary code with
the privileges of the current user.
This vulnerability is due to insufficient bounds checking when copying
data into a stack allocated buffer. During the processing of a certain EXIF
tag a fixed sized stack buffer is used as a destination location for a memory
copy. This memory copy can cause the bounds of a stack buffer to be overflown
and this condition may lead to arbitrary code execution.
III. ANALYSIS
Exploitation of this vulnerability results in the execution of arbitrary
code with the privileges of the current user. In order to exploit this
vulnerability, a user must load a web page containing a specially
crafted TIFF image. An attacker typically accomplishes this via social
engineering or injecting content into compromised, trusted sites.
Typical social engineering attacks will pass URLs as part of instant
messages or electronic mail.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in version
3.9.2 of libTIFF. Previous versions are not affected.
V. WORKAROUND
iDefense is currently unaware of any workaround for this issue.
VI. VENDOR RESPONSE
Multiple vendors have released patches to address this issue.
Information about downloadable vendor updates can be found by clicking
on the URL shown.
http://www.remotesensing.org/libtiff/v3.9.4.html#libtiff
http://www.ubuntu.com/usn/usn-954-1
https://bugzilla.redhat.com/show_bug.cgi?id=599576
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2010-2067 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
05/27/2010 Initial Vendor Notification
05/27/2010 Initial Vendor Reply
06/21/2010 Coordinated Public Disclosure
IX. CREDIT
This vulnerability was reported to iDefense by Dan Rosenberg.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
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http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2010 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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