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UNIRAS Brief - 590/04 - iDEFENSE Security Advisory 10.22.04 - Novell SuSe Linux LibTIFF Heap Overflow



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 590/04 dated 25.10.04  Time: 12:40  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

iDEFENSE Security Advisory 10.22.04 - Novell SuSe Linux LibTIFF Heap Overflow 
Vulnerability

Detail
====== 

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.



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===========================================================================
             
           ESB-2004.0673 -- iDEFENSE Security Advisory 10.22.04
           Novell SuSe Linux LibTIFF Heap Overflow Vulnerability
                              25 October 2004

===========================================================================

        

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

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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@xxxxxxxxxxxx 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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UNIRAS wishes to acknowledge the contributions of iDEFENSE for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
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<End of UNIRAS Briefing>

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