Date: Fri, 22 Oct 2004 13:34:48 -0400
From: customer service mailbox <customerservice@idefense.com>
To: bugtraq@securityfocus.com, vulnwatch@vulnwatch.org
Subject: iDEFENSE Security Advisory XX.XX.04 - Novell SuSe Linux LibTIFF Heap Overflow Vulnerability
Novell SuSe Linux LibTIFF Heap Overflow Vulnerability
iDEFENSE Security Advisory 10.22.04
www.idefense.com/application/poi/display?id=3D154&type=3Dvulnerabilities
October 22, 2004
I. BACKGROUND
libtiff provides support for using the Tag Image File Format (TIFF), a
widely used format for storing image data.
II. DESCRIPTION
An exploitable heap overflow in the handling of malformed tiff files has
been discovered in the latest version of libtiff when JPEG support has
been enabled.
The overflow occurs in the OJPEGVSetField() function of
libtiff/tif_ojpeg.c. During processing, it is assumed that more than 255
bytes will not be processed, however in certain cases it is possible to
cause up to 16 times that amount of data to be processed, thus causing
the overflow.
III. ANALYSIS
An attacker can exploit the above-described vulnerability to execute
arbitrary code under the permissions of the target user. Successful
exploitation requires that the attacker convince the end-user to open
the malicious tiff file using an application linked with a vulnerable
version of libtiff.
IV. DETECTION
iDEFENSE has confirmed the existence of this vulnerability in version
3.6.1 of libtiff when compiled with optional OJPEG_SUPPORT. This option
is enabled by default under SuSE Linux 9.1 Personal and Suse Linux 9.1
Professional.
V. WORKAROUND
Only open files from trusted users. Alternatively, recompile libtiff
without the optional OJPEG_SUPPORT.
VI. VENDOR RESPONSE
This issue is addressed in SUSE-SA:2004:038
http://www.suse.de/de/security/2004_38_libtiff.html
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-0929 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
09/09/2004 Initial vendor notification
09/09/2004=A0=A0=A0Vendor response
10/22/2004=A0=A0=A0Coordinated public disclosure
IX. CREDIT
Andrei Nigmatulin is credited with this discovery.
Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp
X. LEGAL NOTICES
Copyright =A9 2004 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
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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.
