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Ubuntu Security Notice USN-5321-3
March 24, 2022

firefox regressions
==========================================================================

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

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

USN-5321-1 introduced minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-5321-1 fixed vulnerabilities in Firefox. The update introduced
several minor regressions. 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 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                         98.0.2+build1-0ubuntu0.21.10.1

Ubuntu 20.04 LTS:
  firefox                         98.0.2+build1-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  firefox                         98.0.2+build1-0ubuntu0.18.04.1

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

References:
  https://ubuntu.com/security/notices/USN-5321-3
  https://ubuntu.com/security/notices/USN-5321-1
  https://launchpad.net/bugs/1966306

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/98.0.2+build1-0ubuntu0.21.10.1
  https://launchpad.net/ubuntu/+source/firefox/98.0.2+build1-0ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/firefox/98.0.2+build1-0ubuntu0.18.04.1