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Mozilla Foundation Security Advisory 2006-49
Title: Heap buffer overwrite on malformed VCard
Announced: July 25, 2006
Reporter: Daniel Veditz (Mozilla)
Products: Thunderbird, SeaMonkey
Fixed in: Thunderbird 18.104.22.168
A VCard attachment with a malformed base64 field (such as a photo) can trigger a heap buffer overwrite. These have proven exploitable in the past, though in this case the overwrite is accompanied by an integer underflow that would attempt to copy more data than the typical machine has, leading to a crash.
Turn off the in-line display of attachments and do not click on or open VCard attachments until you upgrade to a fixed version.