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Ubuntu Security Notice USN-6562-2
January 11, 2024

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

- Ubuntu 20.04 LTS

Summary:

USN-6562-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6562-1 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-2023-6865,
 CVE-2023-6857, CVE-2023-6858, CVE-2023-6859, CVE-2023-6866, CVE-2023-6867,
 CVE-2023-6861, CVE-2023-6869, CVE-2023-6871, CVE-2023-6872, CVE-2023-6863,
 CVE-2023-6864, CVE-2023-6873)
 
 DoHyun Lee discovered that Firefox did not properly manage memory when used
 on systems with the Mesa VM driver. An attacker could potentially exploit
 this issue to execute arbitrary code. (CVE-2023-6856)
 
 George Pantela and Hubert Kario discovered that Firefox using multiple NSS
 NIST curves which were susceptible to a side-channel attack known as
 "Minerva". An attacker could potentially exploit this issue to obtain
 sensitive information. (CVE-2023-6135)
 
 Andrew Osmond discovered that Firefox did not properly validate the textures
 produced by remote decoders. An attacker could potentially exploit this
 issue to escape the sandbox. (CVE-2023-6860)

Update instructions:

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

Ubuntu 20.04 LTS:
  firefox                         121.0.1+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-6562-2
  https://ubuntu.com/security/notices/USN-6562-1
  https://launchpad.net/bugs/2048961

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/121.0.1+build1-0ubuntu0.20.04.1