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Mozilla Foundation Security Advisory 2013-55

Title: SVG filters can lead to information disclosure
Impact: High
Announced: June 25, 2013
Reporter: Paul Stone
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 Paul Stone of Context Information Security discovered that timing differences in the processing of SVG format images with filters could allow for pixel values to be read. This could potentially allow for text values to be read across domains, leading to information disclosure.

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.