RHSA-2008:0533: Important: bind security update

First published: Tue Jul 08 2008(Updated: )

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

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