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Mozilla Foundation Security Advisory 2006-40

Double-free on malformed VCard

Announced
June 1, 2006
Reporter
Masatoshi Kimura
Impact
Critical
Products
SeaMonkey, Thunderbird
Fixed in
  • SeaMonkey 1.0.2
  • Thunderbird 1.5.0.4

Description

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.

Workaround

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.

References