Thunderbird could be made to crash or run programs as your login.
USN-1758-1 fixed vulnerabilities in Firefox. This update provides the corresponding update for Thunderbird.
13 March 2013
A security issue affects these releases of Ubuntu and its derivatives:
Thunderbird could be made to crash or run programs as your login.
USN-1758-1 fixed vulnerabilities in Firefox. This update provides the corresponding update for Thunderbird.
Original advisory details:
It was discovered that Firefox contained a memory safety issue. If a user were tricked into opening a specially crafted page with the HTML editor, a remote attacker could exploit this to execute arbitrary code with the privileges of the user invoking the program.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart Thunderbird to make all the necessary changes.