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Mozilla Foundation Security Advisory 2006-40

Title: Double-free on malformed VCard
Impact: Critical
Date: June 1, 2006
Reporter: Masatoshi Kimura
Products: Thunderbird, SeaMonkey

Fixed in: Thunderbird
  SeaMonkey 1.0.2


Masatoshi Kimura reported a hang caused by a double-free in Thunderbird when processing a large VCard with invalid base64 characters in it. Since an attacker can supply an arbitrary amount of well-formed VCard data before introducing the error we presume this could be exploited to run code of the attacker's choosing.


From the View menu de-select "Display Attachments Inline", and do not open any VCard attachments (.vcf extension) until you upgrade to a fixed version.