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USN-2893-1: Firefox vulnerability

11 February 2016

A same-origin-policy bypass was discovered in Firefox.



  • firefox - Mozilla Open Source web browser


Jason Pang discovered that service workers intercept responses to plugin
network requests made through the browser. An attacker could potentially
exploit this to bypass same origin restrictions using the Flash plugin.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 15.10
Ubuntu 14.04
Ubuntu 12.04

After a standard system update you need to restart Firefox to make
all the necessary changes.