A Firefox regressions update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

USN-6074-3: Firefox regressions

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Ubuntu Security Notice USN-6074-3
May 24, 2023

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

USN-6074-2 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6074-1 fixed vulnerabilities and USN-6074-2 fixed minor regressions 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, obtain sensitive
information across domains, or execute arbitrary code. (CVE-2023-32205,
CVE-2023-32207, CVE-2023-32210, CVE-2023-32211, CVE-2023-32212,
CVE-2023-32213, CVE-2023-32215, CVE-2023-32216)

Irvan Kurniawan discovered that Firefox did not properly manage memory
when using RLBox Expat driver. An attacker could potentially exploits this
issue to cause a denial of service. (CVE-2023-32206)

Anne van Kesteren discovered that Firefox did not properly validate the
import() call in service workers. An attacker could potentially exploits
this to obtain sensitive information. (CVE-2023-32208)

Sam Ezeh discovered that Firefox did not properly handle certain favicon
image files. If a user were tricked into opening a malicicous favicon file,
an attacker could cause a denial of service. (CVE-2023-32209)

Update instructions:

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

Ubuntu 20.04 LTS:
firefox 113.0.2+build1-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
firefox 113.0.2+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-6074-3
  https://ubuntu.com/security/notices/USN-6074-1
  https://launchpad.net/bugs/2020649

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/113.0.2+build1-0ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/firefox/113.0.2+build1-0ubuntu0.18.04.1