On July 31, in a security notice, Canonical published details about a Ghostscript vulnerability for its Ubuntu 13.04 (Raring Ringtail) operating systems.According to Canonical, Ghostscript could have been made to crash if it opened a specially crafted file.
It was discovered that Little CMS did not properly verify certain memory allocations. If a user or automated system using Little CMS was tricked into opening a specially crafted file, an attacker could cause Little CMS to crash. This update provides the same changes for Ghostscript.
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 latest libgs9 package, 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.