Thunderbird security flaw (highly critical)

This vulnerability caused due to a boundary error in the GIF image processing of Netscape extension 2 blocks and can be exploited to cause a heap-based buffer overflow via a specially crafted image.

This vulnerability is leveled as highly critical!

Successful exploitation may allow execution of arbitrary code.

The vulnerability has been reported in versions prior to 1.0.2.

Solution:
Update to version 1.0.2.
http://www.mozilla.org/products/thunderbird/

Provided and/or discovered by:
Mark Dowd, ISS X-Force