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Mozilla Foundation Security Advisory 2011-24

Title: Cookie isolation error
Impact: Moderate
Announced: June 21, 2011
Reporter: David Chan
Products: Firefox, Thunderbird

Fixed in: Firefox 3.6.18
  Thunderbird 3.1.11

Description

Mozilla security researcher David Chan reported that cookies set for example.com. (note the trailing dot) and example.com were treated as interchangeable. This is a violation of same-origin conventions and could potentially lead to leakage of cookie data to the wrong party.

This issue did not affect Firefox 4, SeaMonkey 2.1, or newer Mozilla-based products.

References