The remote Samba server is affected by a remote security bypass attack vector.
According to its banner, the version of Samba is 4.x earlier than 4.0.1. It is therefore affected by a flaw when acting as an AD (Active Directory) DC (Domain Controller). The vulnerability is triggered when a user or group is granted any access to a LDAP directory object based on objectClass or granted write access to any attribute on the object. This results in an authenticated user automatically being granted write access to the object or all attributes.
Upgrade Samba to version 4.0.1 or later.