14 DAY TRIAL // On July 29, in a security notice, Canonical published details about a Bind vulnerability in its Ubuntu 13.04, Ubuntu 12.10, Ubuntu 12.04 LTS, and Ubuntu 10.04 LTS operating systems.
According to Canonical, Bind could have been made to crash, if it received specially crafted network traffic.
It has been discovered that Bind incorrectly handled certain malformed rdata. A remote attacker could use this flaw with a specially crafted query to cause Bind to stop responding, resulting in a denial of service.
For a more detailed description of the security problems, you can see Canonical's security notification.
The security flaws can be fixed if you upgrade your system(s) to the latest bind9 and libdns 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 the changes.