On September 30, Canonical published in a security notice details about Python 3.3 vulnerabilities for its Ubuntu 13.04 and Ubuntu 12.10 operating systems.
According to Canonical, Several security issues have been fixed in Python 3.3.
For example, it has been discovered that Python incorrectly handled matching multiple wildcards in SSL certificate hostnames. An attacker could have exploited this to cause Python to consume resources, resulting in a denial of service.
For a more detailed description of the security problems, you can visit Canonical's security notification.
The security flaws can be fixed if you upgrade your system(s) to the python3.3-minimal and python3.3 packages, specific to each distribution. To apply the update, run the Update Manager application.
In general, a standard system update will make all the necessary changes. A system restart will not be necessary to implement them.