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Ubuntu Security Notice USN-4165-2
November 05, 2019

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

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN-4165-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-4165-1 fixed vulnerabilities in Firefox. The update introduced various
minor regressions. This update fixes the problems.

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, bypass same-origin restrictions, conduct cross-site
 scripting (XSS) attacks, bypass content security policy (CSP) protections,
 or execute arbitrary code.

Update instructions:

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

Ubuntu 19.10:
  firefox                         70.0.1+build1-0ubuntu0.19.10.1

Ubuntu 19.04:
  firefox                         70.0.1+build1-0ubuntu0.19.04.1

Ubuntu 18.04 LTS:
  firefox                         70.0.1+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox                         70.0.1+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/4165-2
  https://usn.ubuntu.com/4165-1
  https://launchpad.net/bugs/1851445

Package Information:

https://launchpad.net/ubuntu/+source/firefox/70.0.1+build1-0ubuntu0.19.10.1

https://launchpad.net/ubuntu/+source/firefox/70.0.1+build1-0ubuntu0.19.04.1

https://launchpad.net/ubuntu/+source/firefox/70.0.1+build1-0ubuntu0.18.04.1

https://launchpad.net/ubuntu/+source/firefox/70.0.1+build1-0ubuntu0.16.04.1