Executive Summary

Title Firefox regression
Name USN-4353-2 First vendor Publication 2020-05-12
Vendor Ubuntu Last vendor Modification 2020-05-12
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores


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

- Ubuntu 20.04 LTS - Ubuntu 19.10 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS


USN-4353-1 caused a regression in Firefox.

Software Description: - firefox: Mozilla Open Source web browser


USN-4353-1 fixed vulnerabilities in Firefox. The update caused a regression that impaired the functionality of some addons. 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 in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, bypass security
restrictions, spoof the URL bar, or execute arbitrary code.
(CVE-2020-6831, CVE-2020-12387, CVE-2020-12390, CVE-2020-12391,
CVE-2020-12394, CVE-2020-12395, CVE-2020-12396)
It was discovered that the Devtools’ ‘Copy as cURL’ feature did not
properly HTTP POST data of a request. If a user were tricked in to using
the ‘Copy as cURL’ feature to copy and paste a command with specially
crafted data in to a terminal, an attacker could potentially exploit this
to obtain sensitive information from local files.

Update instructions:

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

Ubuntu 20.04 LTS:
firefox 76.0.1+build1-0ubuntu0.20.04.1

Ubuntu 19.10:
firefox 76.0.1+build1-0ubuntu0.19.10.1

Ubuntu 18.04 LTS:
firefox 76.0.1+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
firefox 76.0.1+build1-0ubuntu0.16.04.1

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


Package Information:





Original Source

Url : http://www.ubuntu.com/usn/USN-4353-2

Alert History

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Date Informations
2020-05-13 00:19:12
  • First insertion