USN-4383-1: Firefox vulnerabilities

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Ubuntu security notices

firefox vulnerabilities

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

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

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, spoof the addressbar, or execute arbitrary code. (CVE-2020-12405, CVE-2020-12406, CVE-2020-12407, CVE-2020-12408, CVE-2020-12409, CVE-2020-12410, CVE-2020-12411)

It was discovered that NSS showed timing differences when performing DSA signatures. An attacker could potentially exploit this to obtain private keys using a timing attack. (CVE-2020-12399)

Update instructions

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

Ubuntu 20.04 LTS
firefox - 77.0.1+build1-0ubuntu0.20.04.1
Ubuntu 19.10
firefox - 77.0.1+build1-0ubuntu0.19.10.1
Ubuntu 18.04 LTS
firefox - 77.0.1+build1-0ubuntu0.18.04.1
Ubuntu 16.04 LTS
firefox - 77.0.1+build1-0ubuntu0.16.04.1

To update your system, please follow these instructions:

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


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