A Firefox security update has been released for Ubuntu 14.04 ESM and 16.04 ESM.

USN-5321-2: Firefox vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5321-2
March 17, 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:

USN-5321-1 fixed vulnerabilities in Firefox. The update didn't include
arm64 because of a regression. This update provides the corresponding
update for arm64.

This update also removes Yandex and Mail.ru as optional search providers
in the drop-down search menu.

Original advisory 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, spoof the browser
UI, bypass security restrictions, obtain sensitive information, or execute
arbitrary code. (CVE-2022-0843, CVE-2022-26381, CVE-2022-26382,
CVE-2022-26383, CVE-2022-26384, CVE-2022-26385)
A TOCTOU bug was discovered when verifying addon signatures during
install. A local attacker could potentially exploit this to trick a
user into installing an addon with an invalid signature.
(CVE-2022-26387)

Update instructions:

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

Ubuntu 21.10:
firefox 98.0.1+build2-0ubuntu0.21.10.1

Ubuntu 20.04 LTS:
firefox 98.0.1+build2-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
firefox 98.0.1+build2-0ubuntu0.18.04.1

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

References:
https://ubuntu.com/security/notices/USN-5321-2
https://ubuntu.com/security/notices/USN-5321-1
CVE-2022-0843, CVE-2022-26381, CVE-2022-26382, CVE-2022-26383,
CVE-2022-26384, CVE-2022-26385, CVE-2022-26387

Package Information:

https://launchpad.net/ubuntu/+source/firefox/98.0.1+build2-0ubuntu0.21.10.1

https://launchpad.net/ubuntu/+source/firefox/98.0.1+build2-0ubuntu0.20.04.1

https://launchpad.net/ubuntu/+source/firefox/98.0.1+build2-0ubuntu0.18.04.1