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ESB-2005.0237 -- ISS Protection Brief -- Mozilla Foundation GIF Overflow

Date: 24 March 2005
References: ESB-2005.0242  ESB-2005.0243  

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             AUSCERT External Security Bulletin Redistribution

                   ESB-2005.0237 -- ISS Protection Brief
                      Mozilla Foundation GIF Overflow
                               24 March 2005


        AusCERT Security Bulletin Summary

Product:           Mozilla
                   Mozilla Firefox
                   Mozilla Thunderbird
Publisher:         ISS
Operating System:  Windows
                   Linux variants
                   Mac OS X
Impact:            Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated

Original Bulletin:

Comment: The Mozilla Foundation has released an update to fix this
         vulnerability, which is available at:

- --------------------------BEGIN INCLUDED TEXT--------------------


Internet Security Systems Protection Brief
March 23, 2005

Mozilla Foundation GIF Overflow


ISS has shipped protection for a flaw X-Force has discovered in the GIF 
image processing library used in software developed by the Mozilla 
Foundation. This library is used by the Firefox web browser, the Mozilla 
browser, and Mozilla.s Thunderbird Mail client. By crafting a GIF file in 
a malicious manner, an attacker is able to trigger a heap overflow within 
the application viewing the image, leading to arbitrary code execution and 
remote compromise.

Business Impact:

Compromise of networks and machines using affected Mozilla products 
may lead to exposure of confidential information, loss of productivity, 
and further network compromise. An attacker would be required to cause 
a user to view a malicious website or email containing a maliciously 
crafted image. Successful exploitation would grant an attacker the privileges 
of the user viewing the image, up to and including administrative privileges. 

For the complete X-Force Protection Advisory, please visit:


Internet Security Systems, Inc. (ISS) is the trusted expert to global 
enterprises and world governments, providing products and services 
that protect against Internet threats. An established world leader 
in security since 1994, ISS delivers proven cost efficiencies and 
reduces regulatory and business risk across the enterprise for 
more than 11,000 customers worldwide. ISS products and services 
are based on the proactive security intelligence conducted by ISS. 
X-ForceĀ® research and development team . the unequivocal world 
authority in vulnerability and threat research. Headquartered 
in Atlanta, Internet Security Systems has additional operations 
throughout the Americas, Asia, Australia, Europe and the Middle East. 

Copyright (c) 2005 Internet Security Systems, Inc. All rights reserved 

This document is not to be edited or altered in any way without the 
express written consent of Internet Security Systems, Inc. If you wish 
to reprint the whole or any part of this document, please email for permission. You may provide links to this document 
from your web site, and you may make copies of this document in 
accordance with the fair use doctrine of the U.S. copyright laws. 

Disclaimer: The information within this paper may change without notice. 
Use of this information constitutes acceptance for use in an AS IS 
condition. There are NO warranties, implied or otherwise, with regard 
to this information or its use. Any use of this information is at 
the user's risk. In no event shall the author/distributor (Internet 
Security Systems X-Force) be held liable for any damages whatsoever 
arising out of or in connection with the use or spread of this 

X-Force PGP Key available on MIT's PGP key server and's key 
server, as well as at 
Please send suggestions, updates, and comments to: of Internet Security Systems, Inc. 

Version: 2.6.2


- --------------------------END INCLUDED TEXT--------------------

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