ISS Protection Brief: Mozilla Foundation GIF Overflow

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Internet Security Systems Protection Brief
March 23, 2005

Mozilla Foundation GIF Overflow

Summary:

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:
http://xforce.iss.net/xforce/alerts/id/191

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.
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authority in vulnerability and threat research. Headquartered
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