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Mozilla Foundation Security Advisory 2012-82

top object and location property accessible by plugins

Announced
October 9, 2012
Reporter
Mariusz Mlynski
Impact
High
Products
Firefox, Firefox ESR, SeaMonkey, Thunderbird, Thunderbird ESR
Fixed in
  • Firefox 16
  • Firefox ESR 10.0.8
  • SeaMonkey 2.13
  • Thunderbird 16
  • Thunderbird ESR 10.0.8

Description

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.

References