N/A - USN-4353-1

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

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 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. (CVE-2020-12392)

Update instructions:

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

Ubuntu 20.04 LTS:
firefox 76.0+build2-0ubuntu0.20.04.1

Ubuntu 19.10:
firefox 76.0+build2-0ubuntu0.19.10.1

Ubuntu 18.04 LTS:
firefox 76.0+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
firefox 76.0+build2-0ubuntu0.16.04.1

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

References:
https://usn.ubuntu.com/4353-1
CVE-2020-12387, CVE-2020-12390, CVE-2020-12391, CVE-2020-12392,
CVE-2020-12394, CVE-2020-12395, CVE-2020-12396, CVE-2020-6831

Package Information:
https://launchpad.net/ubuntu/+source/firefox/76.0+build2-0ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/firefox/76.0+build2-0ubuntu0.19.10.1
https://launchpad.net/ubuntu/+source/firefox/76.0+build2-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/firefox/76.0+build2-0ubuntu0.16.04.1