Updated bind packages that help mitigate DNS spoofing attacks are nowavailable. This update has been rated as having important security impact by the RedHat Security Response Team.We have updated the Enterprise Linux 5 packages in this advisory. Thedefault and sample caching-nameserver configuration files have been updatedso that they do not specify a fixed query-source port. Administratorswishing to take advantage of randomized UDP source ports should check theirconfiguration file to ensure they have not specified fixed query-source ports.ISC BIND (Berkeley Internet Name Domain) is an implementation of the DNS(Domain Name System) protocols.