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Ubuntu Security Notice USN-6562-1
January 02, 2024

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

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

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+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-6562-1
  CVE-2023-6135, CVE-2023-6856, CVE-2023-6857, CVE-2023-6858,
  CVE-2023-6859, CVE-2023-6860, CVE-2023-6861, CVE-2023-6863,
  CVE-2023-6864, CVE-2023-6865, CVE-2023-6866, CVE-2023-6867,
  CVE-2023-6869, CVE-2023-6871, CVE-2023-6872, CVE-2023-6873

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/121.0+build1-0ubuntu0.20.04.1