14 DAY TRIAL // On August 14, in a security notice, Canonical published details about a SPICE vulnerability in its Ubuntu 13.04 (Saucy Salamander) operating systems.
According to Canonical, SPICE could have been made to crash, if it received specially crafted network traffic.
It has been discovered that SPICE incorrectly handled certain network errors. An attacker could use this issue to cause the SPICE server to crash, 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 libspice-server1 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.