“An advertisement on a news site in Russia was serving a Firefox exploit that searched for sensitive files and uploaded them to a server that appears to be in Ukraine. This morning Mozilla released security updates that fix the vulnerability. All Firefox users are urged to update to Firefox 39.0.3. The fix has also been shipped in Firefox ESR 38.1.1. The vulnerability comes from the interaction of the mechanism that enforces JavaScript context separation (the ‘same origin policy’) and Firefox’s PDF Viewer. Mozilla products that don’t contain the PDF Viewer, such as Firefox for Android, are not vulnerable. The exploit leaves no trace it has been run on the local machine.”
https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/
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