USN-3705-1: Firefox vulnerabilities

5 July 2018

firefox vulnerabilities

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

  • Ubuntu 18.04 LTS
  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


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

Software Description

  • firefox - Mozilla Open Source web browser


Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, read uninitialized memory, bypass same-origin restrictions, bypass CORS restrictions, bypass CSRF protections, obtain sensitive information, or execute arbitrary code. (CVE-2018-5156, CVE-2018-5186, CVE-2018-5187, CVE-2018-5188, CVE-2018-12358, CVE-2018-12359, CVE-2018-12360, CVE-2018-12361, CVE-2018-12362, CVE-2018-12363, CVE-2018-12364, CVE-2018-12365, CVE-2018-12366, CVE-2018-12367, CVE-2018-12370, CVE-2018-12371)

A security issue was discovered with WebExtensions. If a user were tricked in to installing a specially crafted extension, an attacker could potentially exploit this to obtain full browser permissions. (CVE-2018-12369)

Update instructions

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

Ubuntu 18.04 LTS
firefox - 61.0+build3-0ubuntu0.18.04.1
Ubuntu 17.10
firefox - 61.0+build3-0ubuntu0.17.10.1
Ubuntu 16.04 LTS
firefox - 61.0+build3-0ubuntu0.16.04.2
Ubuntu 14.04 LTS
firefox - 61.0+build3-0ubuntu0.14.04.2

To update your system, please follow these instructions:

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