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Ubuntu: USN-4637-1 Critical: Firefox Denial Of Service Risks

ubuntu
Calendar Grey November 18, 2020
Dist Ubuntu Esm H88
Update concerning security flaws in Firefox impacting Ubuntu versions 20.10, 20.04 LTS, and 18.04 LTS identified in November 2020.
Firefox could be made to crash or run programs as your login if it opened a malicious website.

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, 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.

Topics%20covered

Topics Covered

security advisory denial of service critical firefox ubuntu

Update Instructions

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

Ubuntu 20.10:
  firefox                         83.0+build2-0ubuntu0.20.10.1

Ubuntu 20.04 LTS:
  firefox                         83.0+build2-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  firefox                         83.0+build2-0ubuntu0.18.04.2

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

References

https://ubuntu.com/security/notices/USN-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

Severity
critical
Lowest
Low
Medium
High
Critical

November 18, 2020

Topics%20covered

Topics Covered

security advisory denial of service critical firefox ubuntu

Package Information

https://launchpad.net/ubuntu/+source/firefox/83.0+build2-0ubuntu0.20.10.1
https://launchpad.net/ubuntu/+source/firefox/83.0+build2-0ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/firefox/83.0+build2-0ubuntu0.18.04.2

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