Official link :
Quote:
https://www.mozilla.org/en-US/security/advisories/mfsa2015-78/
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Link which explains it more simply in "english" at :
Quote:
http://www.welivesecurity.com/2015/08/11/firefox-under-fire-anatomy-of-latest-0-day-attack/
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What it means for US :
If you do not update your Firefox browser to the latest version (39.0.3 as of now)
AND
if you open a malicious PDF file from some website in the embedded PDF Viewer, then it
allows attackers to read and write files on local machine as well as upload them to a remote server.
ALL of us can be affected by this.
Please update your browsers to the latest version.