14 DAY TRIAL // On April 16, in a security notice Canonical published details about a Samba vulnerability for its Ubuntu 12.04 LTS (Precise Pangolin) operating system.
According to Canonical, Samba would allow unintended write access to files over the network.
It was discovered that Samba incorrectly handled CIFS share attributes when SMB2 was used. A remote authenticated user have possibly gained write access to certain shares, bypassing the intended permissions.
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 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 the changes.