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Mozilla Foundation Security Advisory 2008-46

Title: Heap overflow when canceling newsgroup message
Impact: Critical
Announced: September 25, 2008
Reporter: Georgi Guninski
Products: Thunderbird, SeaMonkey

Fixed in: Thunderbird 2.0.0.17
  SeaMonkey 1.1.12

Description

Georgi Guninski reported a buffer overflow in the handling of cancelled newsgroup messages. The error was caused by too small a heap buffer being allocated to store message header information. This buffer could be overrun by an attacker using a specially crafted message which could crash the mail reader and potentially be used to run arbitrary code on the victim's computer.

References