USN-3516-1: Firefox vulnerabilities

Ubuntu Security Notice USN-3516-1

5th January, 2018

firefox vulnerabilities

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

  • Ubuntu 17.10
  • Ubuntu 17.04
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Firefox could be made to expose sensitive information.

Software description

  • firefox - Mozilla Open Source web browser


It was discovered that speculative execution performed by modern CPUs
could leak information through a timing side-channel attack, and that
this could be exploited in web browser JavaScript engines. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit this to obtain sensitive information from other
domains, bypassing same-origin restrictions. (CVE-2017-5715,
CVE-2017-5753, CVE-2017-5754).

Update instructions

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

Ubuntu 17.10:
firefox 57.0.4+build1-0ubuntu0.17.10.1
Ubuntu 17.04:
firefox 57.0.4+build1-0ubuntu0.17.04.1
Ubuntu 16.04 LTS:
firefox 57.0.4+build1-0ubuntu0.16.04.1
Ubuntu 14.04 LTS:
firefox 57.0.4+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.


CVE-2017-5715, CVE-2017-5753, CVE-2017-5754