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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="200908-02">
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<title>BIND: Denial of Service</title>
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<synopsis>
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Dynamic Update packets can cause a Denial of Service in the BIND daemon.
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</synopsis>
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<product type="ebuild">bind</product>
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<announced>2009-08-01</announced>
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<revised count="01">2009-08-01</revised>
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<bug>279508</bug>
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<access>remote</access>
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<affected>
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<package name="net-dns/bind" auto="yes" arch="*">
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<unaffected range="ge">9.4.3_p3</unaffected>
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<vulnerable range="lt">9.4.3_p3</vulnerable>
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</package>
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</affected>
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<background>
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<p>
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ISC BIND is the Internet Systems Consortium implementation of the
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Domain Name System (DNS) protocol.
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</p>
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</background>
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<description>
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<p>
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Matthias Urlichs reported that the dns_db_findrdataset() function fails
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when the prerequisite section of the dynamic update message contains a
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record of type "ANY" and where at least one RRset for this FQDN exists
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on the server.
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</p>
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</description>
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<impact type="normal">
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<p>
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A remote unauthenticated attacker could send a specially crafted
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dynamic update message to the BIND daemon (named), leading to a Denial
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of Service (daemon crash). This vulnerability affects all primary
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(master) servers -- it is not limited to those that are configured to
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allow dynamic updates.
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</p>
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</impact>
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<workaround>
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<p>
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Configure a firewall that performs Deep Packet Inspection to prevent
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nsupdate messages from reaching named. Alternatively, expose only
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secondary (slave) servers to untrusted networks.
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</p>
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</workaround>
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<resolution>
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<p>
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All BIND users should upgrade to the latest version:
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</p>
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<code>
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# emerge --sync
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# emerge --ask --oneshot --verbose ">=net-dns/bind-9.4.3_p3"</code>
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</resolution>
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<references>
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<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0696">CVE-2009-0696</uri>
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<uri link="https://www.isc.org/node/474">ISC advisory</uri>
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</references>
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<metadata tag="submitter" timestamp="2009-07-28T21:43:47Z">
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rbu
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</metadata>
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<metadata tag="bugReady" timestamp="2009-08-01T20:00:21Z">
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a3li
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</metadata>
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</glsa>
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