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.


External Reference:

http://www.mozilla.org/security/announce/2014/mfsa2014-05.html


Acknowledgements:

Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Jordan Milne as the original reporter.

Statement:

This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5 and 6