A Firefox security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 21.10.

==========================================================================
Ubuntu Security Notice USN-5370-1
April 07, 2022

firefox vulnerabilities
==========================================================================

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

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 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:

Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, execute script
unexpectedly, obtain sensitive information, conduct spoofing attacks,
or execute arbitrary code. (CVE-2022-1097, CVE-2022-24713, CVE-2022-28281,
CVE-2022-28282, CVE-2022-28284, CVE-2022-28285, CVE-2022-28286,
CVE-2022-28288, CVE-2022-28289)

A security issue was discovered with the sourceMapURL feature of devtools.
An attacker could potentially exploit this to include local files that
should have been inaccessible. (CVE-2022-28283)

It was discovered that selecting text caused Firefox to crash in some
circumstances. An attacker could potentially exploit this to cause a
denial of service. (CVE-2022-28287)

Update instructions:

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

Ubuntu 21.10:
firefox 99.0+build2-0ubuntu0.21.10.2

Ubuntu 20.04 LTS:
firefox 99.0+build2-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
firefox 99.0+build2-0ubuntu0.18.04.2

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

References:
  https://ubuntu.com/security/notices/USN-5370-1
CVE-2022-1097, CVE-2022-24713, CVE-2022-28281, CVE-2022-28282,
CVE-2022-28283, CVE-2022-28284, CVE-2022-28285, CVE-2022-28286,
CVE-2022-28287, CVE-2022-28288, CVE-2022-28289

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/99.0+build2-0ubuntu0.21.10.2
  https://launchpad.net/ubuntu/+source/firefox/99.0+build2-0ubuntu0.20.04.2
  https://launchpad.net/ubuntu/+source/firefox/99.0+build2-0ubuntu0.18.04.2