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Mozilla Foundation Security Advisory 2013-36

Title: Bypass of SOW protections allows cloning of protected nodes
Impact: Critical
Announced: April 2, 2013
Reporter: Cody Crews
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 20.0
  Firefox ESR 17.0.5
  Thunderbird 17.0.5
  Thunderbird ESR 17.0.5
  SeaMonkey 2.17

Description

Security researcher Cody Crews reported a mechanism to use the cloneNode method to bypass System Only Wrappers (SOW) and clone a protected node. This allows violation of the browser's same origin policy and could also lead to privilege escalation and the execution of arbitrary code.

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