USN-3761-2: Firefox regressions

13 September 2018

firefox regressions

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

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


USN-3761-1 caused several regressions in Firefox.

Software Description

  • firefox - Mozilla Open Source web browser


USN-3761-1 fixed vulnerabilities in Firefox. The update caused several regressions affecting spellchecker dictionaries and search engines. This update fixes the problems.

We apologize for the inconvenience.

Original advisory details:

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, or execute arbitrary code. (CVE-2018-12375, CVE-2018-12376, CVE-2018-12377, CVE-2018-12378)

It was discovered that if a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords would still be accessible. A local user could exploit this to obtain sensitive information. (CVE-2018-12383)

Update instructions

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

Ubuntu 18.04 LTS
firefox - 62.0+build2-0ubuntu0.18.04.4
Ubuntu 16.04 LTS
firefox - 62.0+build2-0ubuntu0.16.04.4
Ubuntu 14.04 LTS
firefox - 62.0+build2-0ubuntu0.14.04.4

To update your system, please follow these instructions:

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