[USN-6143-3] Firefox regressions
Ubuntu Security Notice USN-6143-3
June 21, 2023
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
USN-6143-2 caused some minor regressions in Firefox.
- firefox: Mozilla Open Source web browser
USN-6143-1 fixed vulnerabilities and USN-6143-2 fixed minor regressions in
Firefox. The update introduced several minor regressions. This update fixes
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,
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)
The problem can be corrected by updating your system to the following
Ubuntu 20.04 LTS:
After a standard system update you need to restart Firefox to make all the
A Firefox regressions update has been released for Ubuntu Linux 20.04 LTS.