Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2004.0673 -- iDEFENSE Security Advisory 10.22.04
Novell SuSe Linux LibTIFF Heap Overflow Vulnerability
25 October 2004
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libtiff 3.6.1
Publisher: iDEFENSE
Operating System: SuSE Linux
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CAN-2004-0929
Original Bulletin URL:
http://www.idefense.com/application/poi/display?id=154&type=vulnerabilities
See also the SuSE announcement:
http://www.suse.de/de/security/2004_38_libtiff.html
- --------------------------BEGIN INCLUDED TEXT--------------------
Novell SuSe Linux LibTIFF Heap Overflow Vulnerability
iDEFENSE Security Advisory 10.22.04
www.idefense.com/application/poi/display?id=154&type=vulnerabilities
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 Vendor response
10/22/2004 Coordinated 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 © 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
email 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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQCVAwUBQXxLjyh9+71yA2DNAQJebQP+OMAlzKoglovUsRY69zyAH7geKBMmyE/d
qoOFsSw3b6QBXkpWxoIIkGq+cqwzJTS3Hmm/5TKZlLd1HWetiwvkGOaGqJAf4chp
jUrVuTGebUyuF+1og5MaXen3qgwjiu8mBuZMKRPddIO+L2ZAxiyabGOMMoQ9qpzO
7Y58P5jelSQ=
=pJrC
-----END PGP SIGNATURE-----