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Ubuntu Security Notice USN-4383-1
June 04, 2020

firefox vulnerabilities
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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, 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

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

References:
  https://usn.ubuntu.com/4383-1
  CVE-2020-12399, CVE-2020-12405, CVE-2020-12406, CVE-2020-12407,
  CVE-2020-12408, CVE-2020-12409, CVE-2020-12410, CVE-2020-12411

Package Information:

https://launchpad.net/ubuntu/+source/firefox/77.0.1+build1-0ubuntu0.20.04.1

https://launchpad.net/ubuntu/+source/firefox/77.0.1+build1-0ubuntu0.19.10.1

https://launchpad.net/ubuntu/+source/firefox/77.0.1+build1-0ubuntu0.18.04.1

https://launchpad.net/ubuntu/+source/firefox/77.0.1+build1-0ubuntu0.16.04.1