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Mozilla Foundation Security Advisory 2013-99

Security bypass of PDF.js checks using iframes

October 29, 2013
Cody Crews
Firefox, Firefox ESR
Fixed in
  • Firefox 25
  • Firefox ESR 24.1


Security researcher Cody Crews discovered a method to append an iframe into an embedded PDF object rendered with the chrome privileged PDF.js. This can used to bypass security restrictions to load local or chrome privileged files and objects within the embedded PDF object. This can lead to information disclosure of local system files.

In general this flaw cannot be exploited through email in the Thunderbird and Seamonkey products because scripting is disabled, but is potentially a risk in browser or browser-like contexts.