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Mozilla Foundation Security Advisory 2013-53

Title: Execution of unmapped memory through onreadystatechange event
Impact: Critical
Announced: June 25, 2013
Reporter: Nils
Products: Firefox, Thunderbird, Seamonkey

Fixed in: Firefox 22.0
  Firefox ESR 17.0.7
  Thunderbird 17.0.7
  Thunderbird ESR 17.0.7
  SeaMonkey 2.19


Security researcher Nils reported that specially crafted web content using the onreadystatechange event and reloading of pages could sometimes cause a crash when unmapped memory is executed. This crash is potentially exploitable.

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.