Ubuntu 20.04 LTS: USN-4353-2 Critical Firefox Regression Fix

ubuntu

May 12, 2020

USN-4353-1 caused a regression in Firefox.

Summary

USN-4353-1 caused a regression in Firefox.

Software Description:

- firefox: Mozilla Open Source web browser

Details:

USN-4353-1 fixed vulnerabilities in Firefox. The update caused a

regression that impaired the functionality of some addons. This update

fixes the problem.

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, bypass security

restrictions, spoof the URL bar, or execute arbitrary code.

(CVE-2020-6831, CVE-2020-12387, CVE-2020-12390, CVE-2020-12391,

CVE-2020-12394, CVE-2020-12395, CVE-2020-12396)

It was discovered that the Devtools’ ‘Copy as cURL’ feature did not

properly HTTP POST data of a request. If a user were tricked in to using

the ‘Copy as cURL’ feature to copy and paste a command with specially

crafted data in t...

Read the Full Advisory

Topics Covered

security advisory denial of service update Ubuntu firefox regression add-on issues

Update Instructions

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

Ubuntu 20.04 LTS:
  firefox                         76.0.1+build1-0ubuntu0.20.04.1

Ubuntu 19.10:
  firefox                         76.0.1+build1-0ubuntu0.19.10.1

Ubuntu 18.04 LTS:
  firefox                         76.0.1+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox                         76.0.1+build1-0ubuntu0.16.04.1

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