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Vulnerability Note VU#557948Mozilla products vulnerable to heap overflow via specially crafted GIF fileOverviewMozilla products, including the Mozilla Suite, Mozilla Firefox, and Mozilla Thunderbird, are vulnerable to a heap-based overflow in the GIF image-processing routines.I. DescriptionThe Mozilla project produces an application suite (Mozilla Suite), web browsers (Mozilla Firefox), email software (Mozilla Thunderbird), and other products.An image processing library used in some Mozilla products contains a flaw in Graphic Interchange Format (GIF) file handling. A Netscape-specific extension block (Netscape extension 2) may be present in the GIF file that contains a 32-bit integer. This integer is used to determine image buffer space. An attacker may misrepresent this value to exploit a heap overflow condition. The attacker can craft a special GIF file that, when viewed, induces a heap overflow in the Mozilla product that is processing the GIF file.
Mozilla Firefox 1.0.2 Mozilla Thunderbird 1.0.2 Note that other products that use the same image processing library may also be affected. The Mozilla project recommends turning off image loading as a temporary workaround until an update is applied. Systems Affected
References
Thanks to Mark Dowd and the rest of ISS X-Force for reporting this vulnerability. This document was written by Ken MacInnis.
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