USN-2893-1: Firefox vulnerability

11 February 2016

firefox vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 15.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


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

Software Description

  • 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. (CVE-2016-1949)

Update instructions

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

Ubuntu 15.10
firefox - 44.0.2+build1-0ubuntu0.15.10.1
Ubuntu 14.04 LTS
firefox - 44.0.2+build1-0ubuntu0.14.04.1
Ubuntu 12.04 LTS
firefox - 44.0.2+build1-0ubuntu0.12.04.1

To update your system, please follow these instructions:

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