==========================================================================
Ubuntu Security Notice USN-6456-2
November 14, 2023

firefox regressions
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

USN-6456-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6456-1 fixed vulnerabilities in Firefox. The update introduced
several minor regressions. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Multiple security issues were discovered in Firefox. If a user were
 tricked into opening a specially crafted website, an attacker could
 potentially exploit these to cause a denial of service, obtain sensitive
 information across domains, or execute arbitrary code. (CVE-2023-5722,
 CVE-2023-5724, CVE-2023-5728, CVE-2023-5729, CVE-2023-5730, CVE-2023-5731)
 
 Kelsey Gilbert discovered that Firefox did not properly manage certain
 browser prompts and dialogs due to an insufficient activation-delay. An
 attacker could potentially exploit this issue to perform clickjacking.
 (CVE-2023-5721)
 
 Daniel Veditz discovered that Firefox did not properly validate a cookie
 containing invalid characters. An attacker could potentially exploit this
 issue to cause a denial of service. (CVE-2023-5723)
 
 Shaheen Fazim discovered that Firefox did not properly validate the URLs
 open by installed WebExtension. An attacker could potentially exploit this
 issue to obtain sensitive information. (CVE-2023-5725)

Update instructions:

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

Ubuntu 20.04 LTS:
  firefox                         119.0.1+build1-0ubuntu0.20.04.1

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

References:
  https://ubuntu.com/security/notices/USN-6456-2
  https://ubuntu.com/security/notices/USN-6456-1
  https://launchpad.net/bugs/2043441

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/119.0.1+build1-0ubuntu0.20.04.1