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From: Chris Coulson <chris.coulson@canonical.com>
Reply-To: Ubuntu Security <security@ubuntu.com>
To: ubuntu-security-announce@lists.ubuntu.com
Message-ID: <2e356eb7-ad23-7fc4-c5ff-0943867b4365@canonical.com>
Subject: [USN-5186-1] Firefox vulnerabilities
--03F2TNv5Us97ZglwyATVY8uyb8M6zHyZA
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==========================================================================
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:
https://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:
https://launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.21.10.1
https://launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.21.04.1
https://launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/firefox/95.0+build1-0ubuntu0.18.04.1
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