USN-3552-1: Firefox vulnerability

31 January 2018

firefox vulnerability

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

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Firefox could be made to run programs as your login if it opened a malicious website.

Software Description

  • firefox - Mozilla Open Source web browser


Johann Hofmann discovered that HTML fragments created for chrome-privileged documents were not properly sanitized. An attacker could exploit this to execute arbitrary code. (CVE-2018-5124)

Update instructions

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

Ubuntu 17.10
firefox - 58.0.1+build1-0ubuntu0.17.10.1
Ubuntu 16.04 LTS
firefox - 58.0.1+build1-0ubuntu0.16.04.1
Ubuntu 14.04 LTS
firefox - 58.0.1+build1-0ubuntu0.14.04.1

To update your system, please follow these instructions:

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