RHSA-2009:1620: Moderate: bind security update

First published: Mon Nov 30 2009(Updated: )

The Berkeley Internet Name Domain (BIND) is an implementation of the Domain<br>Name System (DNS) protocols. BIND includes a DNS server (named); a resolver<br>library (routines for applications to use when interfacing with DNS); and<br>tools for verifying that the DNS server is operating correctly.<br>Michael Sinatra discovered that BIND was incorrectly caching responses<br>without performing proper DNSSEC validation, when those responses were<br>received during the resolution of a recursive client query that requested<br>DNSSEC records but indicated that checking should be disabled. A remote<br>attacker could use this flaw to bypass the DNSSEC validation check and<br>perform a cache poisoning attack if the target BIND server was receiving<br>such client queries. (CVE-2009-4022)<br>All BIND users are advised to upgrade to these updated packages, which<br>contain a backported patch to resolve this issue. After installing the<br>update, the BIND daemon (named) will be restarted automatically.

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