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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200908-02">
<title>BIND: Denial of Service</title>
<synopsis>
Dynamic Update packets can cause a Denial of Service in the BIND daemon.
</synopsis>
<product type="ebuild">bind</product>
<announced>August 01, 2009</announced>
<revised>August 01, 2009: 01</revised>
<bug>279508</bug>
<access>remote</access>
<affected>
<package name="net-dns/bind" auto="yes" arch="*">
<unaffected range="ge">9.4.3_p3</unaffected>
<vulnerable range="lt">9.4.3_p3</vulnerable>
</package>
</affected>
<background>
<p>
ISC BIND is the Internet Systems Consortium implementation of the
Domain Name System (DNS) protocol.
</p>
</background>
<description>
<p>
Matthias Urlichs reported that the dns_db_findrdataset() function fails
when the prerequisite section of the dynamic update message contains a
record of type "ANY" and where at least one RRset for this FQDN exists
on the server.
</p>
</description>
<impact type="normal">
<p>
A remote unauthenticated attacker could send a specially crafted
dynamic update message to the BIND daemon (named), leading to a Denial
of Service (daemon crash). This vulnerability affects all primary
(master) servers -- it is not limited to those that are configured to
allow dynamic updates.
</p>
</impact>
<workaround>
<p>
Configure a firewall that performs Deep Packet Inspection to prevent
nsupdate messages from reaching named. Alternatively, expose only
secondary (slave) servers to untrusted networks.
</p>
</workaround>
<resolution>
<p>
All BIND users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-dns/bind-9.4.3_p3&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0696">CVE-2009-0696</uri>
<uri link="https://www.isc.org/node/474">ISC advisory</uri>
</references>
<metadata tag="submitter" timestamp="Tue, 28 Jul 2009 21:43:47 +0000">
rbu
</metadata>
<metadata tag="bugReady" timestamp="Sat, 01 Aug 2009 20:00:21 +0000">
a3li
</metadata>
</glsa>