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Ubuntu Security Notice USN-4637-2
November 19, 2020

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

- 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:

USN-4637-1 fixed vulnerabilities in Firefox. This update provides the
corresponding updates for Ubuntu 16.04 LTS.

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, obtain sensitive
 information across origins, bypass security restrictions, conduct phishing
 attacks, conduct cross-site scripting (XSS) attacks, bypass Content
 Security Policy (CSP) restrictions, conduct DNS rebinding attacks, or
 execute arbitrary code.

Update instructions:

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

Ubuntu 16.04 LTS:
  firefox                         83.0+build2-0ubuntu0.16.04.3

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

References:
  https://usn.ubuntu.com/4637-2
  https://usn.ubuntu.com/4637-1
  CVE-2020-16012, CVE-2020-26951, CVE-2020-26952, CVE-2020-26953,
  CVE-2020-26956, CVE-2020-26958, CVE-2020-26959, CVE-2020-26960,
  CVE-2020-26961, CVE-2020-26962, CVE-2020-26963, CVE-2020-26965,
  CVE-2020-26967, CVE-2020-26968, CVE-2020-26969

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/83.0+build2-0ubuntu0.16.04.3