USN-2557-1: Firefox vulnerability

7 April 2015

firefox vulnerability

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

  • Ubuntu 14.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


Firefox could be made to bypass SSL certificate verification.

Software Description

  • firefox - Mozilla Open Source web browser


Muneaki Nishimura discovered a flaw in Mozilla’s HTTP Alternative Services implementation which meant SSL certificate verification could be bypassed in some circumstances. A remote attacker could potentially exploit this to conduct a man in the middle attack. (CVE-2015-0799)

Update instructions

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

Ubuntu 14.10
firefox - 37.0.1+build1-0ubuntu0.14.10.1
Ubuntu 14.04 LTS
firefox - 37.0.1+build1-0ubuntu0.14.04.1
Ubuntu 12.04 LTS
firefox - 37.0.1+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.