USN-2768-1: Firefox vulnerability

16 October 2015

firefox vulnerability

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

  • Ubuntu 15.04
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


Firefox could be made to expose sensitive information across origins

Software Description

  • firefox - Mozilla Open Source web browser


Abdulrahman Alqabandi and Ben Kelly discovered that the fetch() API did not correctly implement the Cross Origin Resource Sharing (CORS) specification. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to obtain sensitive information from other origins. (CVE-2015-7184)

Update instructions

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

Ubuntu 15.04
firefox - 41.0.2+build2-0ubuntu0.15.04.1
Ubuntu 14.04 LTS
firefox - 41.0.2+build2-0ubuntu0.14.04.1
Ubuntu 12.04 LTS
firefox - 41.0.2+build2-0ubuntu0.12.04.1

To update your system, please follow these instructions:

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