A Firefox security update has been released for Ubuntu Linux 19.10, 18.04 LTS, and 16.04 LTS.

USN-4317-1: Firefox vulnerabilities

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Ubuntu Security Notice USN-4317-1
April 04, 2020

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

- Ubuntu 19.10
- 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:

Two use-after-free bugs were discovered in Firefox. If a user were tricked
in to opening a specially crafted website, an attacker could exploit these
to cause a denial of service or execute arbitrary code.

Update instructions:

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

Ubuntu 19.10:
firefox 74.0.1+build1-0ubuntu0.19.10.1

Ubuntu 18.04 LTS:
firefox 74.0.1+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
firefox 74.0.1+build1-0ubuntu0.16.04.1

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

References:
https://usn.ubuntu.com/4317-1
CVE-2020-6819, CVE-2020-6820

Package Information:

https://launchpad.net/ubuntu/+source/firefox/74.0.1+build1-0ubuntu0.19.10.1

https://launchpad.net/ubuntu/+source/firefox/74.0.1+build1-0ubuntu0.18.04.1

https://launchpad.net/ubuntu/+source/firefox/74.0.1+build1-0ubuntu0.16.04.1