14 DAY TRIAL // On December 11, in a security notice, Canonical published details about a Samba vulnerability for its Ubuntu 13.10, Ubuntu 13.04, Ubuntu 12.10, Ubuntu 12.04 LTS, and Ubuntu 10.04 LTS operating systems.
According to the company, several security issues have been fixed in Samba.
It has been discovered that Winbind incorrectly handled invalid group names with the require_membership_of parameter. If an administrator used an invalid group name by mistake, access was granted instead of having the login fail.
For a more detailed description of the problems, you can visit Canonical's security notification.
The security flaws can be fixed if you upgrade your system(s) to the latest samba package, for each specific 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 won't be necessary to implement them.