RHSA-2008:0533: Important: bind security update

ISC BIND (Berkeley Internet Name Domain) is an implementation of the DNS(Domain Name System) protocols.The DNS protocol protects against spoofing attacks by requiring an attackerto predict both the DNS transaction ID and UDP source port of a request. Inrecent years, a number of papers have found problems with DNSimplementations which make it easier for an attacker to perform DNScache-poisoning attacks.Previous versions of BIND did not use randomized UDP source ports. If anattacker was able to predict the random DNS transaction ID, this could makeDNS cache-poisoning attacks easier. In order to provide more resilience,BIND has been updated to use a range of random UDP source ports.(CVE-2008-1447)Note: This errata also updates SELinux policy on Red Hat Enterprise Linux 4and 5 to allow BIND to use random UDP source ports.Users of BIND are advised to upgrade to these updated packages, whichcontain a backported patch to add this functionality.Red Hat would like to thank Dan Kaminsky for reporting this issue.