=========================================================================Ubuntu Security Notice USN-4625-1
November 10, 2020

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Details:

A use-after-free was discovered in Firefox. If a user were tricked in
to opening a specially crafted website, an attacker could exploit this
to execute arbitrary code.

Update instructions:

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

Ubuntu 20.10:
  firefox                         82.0.3+build1-0ubuntu0.20.10.1

Ubuntu 20.04 LTS:
  firefox                         82.0.3+build1-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  firefox                         82.0.3+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox                         82.0.3+build1-0ubuntu0.16.04.1

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

References:
  https://ubuntu.com/security/notices/USN-4625-1
  CVE-2020-26950

Package Information:

https://launchpad.net/ubuntu/+source/firefox/82.0.3+build1-0ubuntu0.20.10.1

https://launchpad.net/ubuntu/+source/firefox/82.0.3+build1-0ubuntu0.20.04.1

https://launchpad.net/ubuntu/+source/firefox/82.0.3+build1-0ubuntu0.18.04.1

https://launchpad.net/ubuntu/+source/firefox/82.0.3+build1-0ubuntu0.16.04.1