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Mozilla Foundation Security Advisory 2014-05

Information disclosure with *FromPoint on iframes

Announced
February 4, 2014
Reporter
Jordan Milne
Impact
Moderate
Products
Firefox, SeaMonkey
Fixed in
  • Firefox 27
  • SeaMonkey 2.24

Description

Security researcher Jordan Milne reported an information leak where document.caretPositionFromPoint and document.elementFromPoint functions could be used on a cross-origin iframe to gain information on the iframe's DOM and other attributes through a timing attack, violating same-origin policy.

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

References