14 DAY TRIAL // On November 21, Canonical announced that the new Mozilla Thunderbird had arrived in the official repositories for its Ubuntu 13.10, Ubuntu 13.04, Ubuntu 12.10, and Ubuntu 12.04 LTS operating systems.
According to the company, multiple security issues have been discovered in Thunderbird. If a user was tricked into connecting to a malicious server, an attacker could have possibly exploited these issues to cause a denial of service via application crash, potentially execute arbitrary code, or lead to information disclosure.
For a more detailed description of these problems, you can check out Canonical's security notification.
Users can simply fix the security flaws by upgrading the operating systems to the latest Thunderbird package specific to each distribution.
A normal system update, executed with the Update Manager, will implement all the necessary changes. You won't need to reboot the computer, but you will have to restart Thunderbird.
Users can also download Mozilla Thunderbird 24.1.1 right now from Softpedia.