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Ubuntu Security Notice USN-6143-3
June 21, 2023

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

- Ubuntu 20.04 LTS

Summary:

USN-6143-2 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6143-1 fixed vulnerabilities and USN-6143-2 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-2023-34414,
 CVE-2023-34416, CVE-2023-34417)
 
 Jun Kokatsu discovered that Firefox did not properly validate site-isolated
 process for a document loaded from a data: URL that was the result of a
 redirect, leading to an open redirect attack. An attacker could possibly
 use this issue to perform phishing attacks. (CVE-2023-34415)

Update instructions:

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

Ubuntu 20.04 LTS:
  firefox                         114.0.2+build1-0ubuntu0.20.04.1

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

References:
  https://ubuntu.com/security/notices/USN-6143-3
  https://ubuntu.com/security/notices/USN-6143-1
  https://launchpad.net/bugs/2024513

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/114.0.2+build1-0ubuntu0.20.04.1