USN-6710-2: Firefox regressions

Releases

• Ubuntu 20.04 LTS

Packages

• 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

• 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://launchpad.net/bugs/2060171