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

[USN-6267-3] Firefox regressions

==========================================================================
Ubuntu Security Notice USN-6267-3
August 21, 2023

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

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

- Ubuntu 20.04 LTS

Summary:

USN-6267-2 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6267-1 fixed vulnerabilities and USN-6267-2 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-2023-4047,
CVE-2023-4048, CVE-2023-4049, CVE-2023-4051, CVE-2023-4053, CVE-2023-4055,
CVE-2023-4056, CVE-2023-4057, CVE-2023-4058)

Max Vlasov discovered that Firefox Offscreen Canvas did not properly track
cross-origin tainting. An attacker could potentially exploit this issue to
access image data from another site in violation of same-origin policy.
(CVE-2023-4045)

Alexander Guryanov discovered that Firefox did not properly update the
value of a global variable in WASM JIT analysis in some circumstances. An
attacker could potentially exploit this issue to cause a denial of service.
(CVE-2023-4046)

Mark Brand discovered that Firefox did not properly validate the size of
an untrusted input stream. An attacker could potentially exploit this issue
to cause a denial of service. (CVE-2023-4050)

Update instructions:

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

Ubuntu 20.04 LTS:
firefox 116.0.3+build2-0ubuntu0.20.04.1

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

References:
https://ubuntu.com/security/notices/USN-6267-3
https://ubuntu.com/security/notices/USN-6267-1
https://launchpad.net/bugs/2032143

Package Information:
https://launchpad.net/ubuntu/+source/firefox/116.0.3+build2-0ubuntu0.20.04.1