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Mozilla Foundation Security Advisory 2012-82

Title: top object and location property accessible by plugins
Impact: High
Announced: October 9, 2012
Reporter: Mariusz Mlynski
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 16
  Firefox ESR 10.0.8
  Thunderbird 16
  Thunderbird ESR 10.0.8
  SeaMonkey 2.13


Security researcher Mariusz Mlynski reported that the location property can be accessed by binary plugins through top.location and top can be shadowed by Object.defineProperty as well. This can allow for possible cross-site scripting (XSS) attacks through plugins.

In general these flaws cannot be exploited through email in the Thunderbird and SeaMonkey products because scripting is disabled, but are potentially a risk in browser or browser-like contexts in those products.