Ubuntu update for keystone

Typically used for cross-site scripting vulnerabilities and privilege escalation vulnerabilities.

This rating is also used for vulnerabilities allowing exposure of sensitive data to local users.

"From remote" describes other vulnerabilities where the attack vector doesn't require access to the system or a local network.

This category covers services that are acceptable to expose to the Internet (e.g. HTTP, HTTPS, SMTP). It also covers client applications used on the Internet and certain vulnerabilities where it is reasonable to assume that a security conscious user can be tricked into performing certain actions.