[USN-5186-1] Firefox vulnerabilities

========================================================================== Ubuntu Security Notice USN-5186-1 December 09, 2021
firefox vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.10 – Ubuntu 21.04 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Summary:
Firefox could be made to crash or run programs as your login if it opened a malicious website.
Software Description: – firefox: Mozilla Open Source web browser
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, conduct spoofing attacks, bypass CSP restrictions, or execute arbitrary code. (CVE-2021-43536, CVE-2021-43537, CVE-2021-43538, CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543, CVE-2021-43545, CVE-2021-43546)
A security issue was discovered with the handling of WebExtension permissions. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to create and install a service worker that wouldn’t be uninstalled with the extension. (CVE-2021-43540)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 21.10: firefox 95.0+build1-0ubuntu0.21.10.1
Ubuntu 21.04: firefox 95.0+build1-0ubuntu0.21.04.1
Ubuntu 20.04 LTS: firefox 95.0+build1-0ubuntu0.20.04.1
Ubuntu 18.04 LTS: firefox 95.0+build1-0ubuntu0.18.04.1
After a standard system update you need to restart Firefox to make all the necessary changes.
References: ubuntu.com/security/notices/USN-5186-1 CVE-2021-43536, CVE-2021-43537, CVE-2021-43538, CVE-2021-43539, CVE-2021-43540, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543, CVE-2021-43545, CVE-2021-43546
Package Information: launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.21.10.1 launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.21.04.1 launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.20.04.1 launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.18.04.1