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Ubuntu Security Notice USN-5186-2

Ubuntu Security Notice USN-5186-2
Posted Dec 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5186-2 - USN-5186-1 fixed vulnerabilities in Firefox. The update introduced several minor regressions. This update fixes the problem. 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. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, spoof, vulnerability
systems | linux, ubuntu
advisories | CVE-2021-43539, CVE-2021-43540, CVE-2021-43545
MD5 | dfad93a492ded55859e2e1d62ade7829

Ubuntu Security Notice USN-5186-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5186-2
December 20, 2021

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

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:

USN-5186-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-5186-1 fixed vulnerabilities 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, 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 95.0.1+build2-0ubuntu0.21.10.1

Ubuntu 21.04:
firefox 95.0.1+build2-0ubuntu0.21.04.1

Ubuntu 20.04 LTS:
firefox 95.0.1+build2-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
firefox 95.0.1+build2-0ubuntu0.18.04.1

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

References:
https://ubuntu.com/security/notices/USN-5186-2
https://ubuntu.com/security/notices/USN-5186-1
https://launchpad.net/bugs/1955433

Package Information:

https://launchpad.net/ubuntu/+source/firefox/95.0.1+build2-0ubuntu0.21.10.1

https://launchpad.net/ubuntu/+source/firefox/95.0.1+build2-0ubuntu0.21.04.1

https://launchpad.net/ubuntu/+source/firefox/95.0.1+build2-0ubuntu0.20.04.1

https://launchpad.net/ubuntu/+source/firefox/95.0.1+build2-0ubuntu0.18.04.1
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