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

USN-5782-3: Firefox regressions

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Ubuntu Security Notice USN-5782-3
January 10, 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-5782-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-5782-1 fixed vulnerabilities in Firefox. The update introduced
several minor regressions. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Firefox was using an out-of-date libusrsctp library.
An attacker could possibly use this library to perform a reentrancy issue
on Firefox. (CVE-2022-46871)

Nika Layzell discovered that Firefox was not performing a check on paste
received from cross-processes. An attacker could potentially exploit this
to obtain sensitive information. (CVE-2022-46872)

Pete Freitag discovered that Firefox did not implement the unsafe-hashes
CSP directive. An attacker who was able to inject markup into a page
otherwise protected by a Content Security Policy may have been able to
inject an executable script. (CVE-2022-46873)

Matthias Zoellner discovered that Firefox was not keeping the filename
ending intact when using the drag-and-drop event. An attacker could
possibly use this issue to add a file with a malicious extension, leading
to execute arbitrary code. (CVE-2022-46874)

Hafiizh discovered that Firefox was not handling fullscreen notifications
when the browser window goes into fullscreen mode. An attacker could
possibly use this issue to spoof the user and obtain sensitive information.
(CVE-2022-46877)

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-2022-46878,
CVE-2022-46879)

Update instructions:

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

Ubuntu 20.04 LTS:
firefox 108.0.2+build1-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
firefox 108.0.2+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-5782-3
  https://ubuntu.com/security/notices/USN-5782-1
  https://launchpad.net/bugs/2002377

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/108.0.2+build1-0ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/firefox/108.0.2+build1-0ubuntu0.18.04.1