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Ubuntu Security Notice USN-6710-2
April 04, 2024

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

- Ubuntu 20.04 LTS

Summary:

USN-6710-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6710-1 fixed vulnerabilities in Firefox. The update introduced
several minor regressions. This update fixes the problem.

Original advisory details:

  Manfred Paul discovered that Firefox did not properly perform bounds
  checking during range analysis, leading to an out-of-bounds write
  vulnerability. A attacker could use this to cause a denial of service,
  or execute arbitrary code. (CVE-2024-29943)
  
  Manfred Paul discovered that Firefox incorrectly handled MessageManager
  listeners under certain circumstances. An attacker who was able to inject
  an event handler into a privileged object may have been able to execute
  arbitrary code. (CVE-2024-29944)

Update instructions:

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

Ubuntu 20.04 LTS:
   firefox                         124.0.2+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-6710-2
   https://ubuntu.com/security/notices/USN-6710-1
   https://launchpad.net/bugs/2060171

Package Information:
   https://launchpad.net/ubuntu/+source/firefox/124.0.2+build1-0ubuntu0.20.04.1