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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200904-10">
<title>Avahi: Denial of Service</title>
<synopsis>
An error in Avahi might lead to a Denial of Service via network and CPU
consumption.
</synopsis>
<product type="ebuild">avahi</product>
<announced>April 08, 2009</announced>
<revised>April 08, 2009: 01</revised>
<bug>260971</bug>
<access>remote</access>
<affected>
<package name="net-dns/avahi" auto="yes" arch="*">
<unaffected range="ge">0.6.24-r2</unaffected>
<vulnerable range="lt">0.6.24-r2</vulnerable>
</package>
</affected>
<background>
<p>
Avahi is a system that facilitates service discovery on a local
network.
</p>
</background>
<description>
<p>
Rob Leslie reported that the
originates_from_local_legacy_unicast_socket() function in
avahi-core/server.c does not account for the network byte order of a
port number when processing incoming multicast packets, leading to a
multicast packet storm.
</p>
</description>
<impact type="normal">
<p>
A remote attacker could send specially crafted legacy unicast mDNS
query packets to the Avahi daemon, resulting in a Denial of Service due
to network bandwidth and CPU consumption.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All Avahi users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-dns/avahi-0.6.24-r2&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0758">CVE-2009-0758</uri>
</references>
<metadata tag="requester" timestamp="Sat, 04 Apr 2009 13:49:21 +0000">
rbu
</metadata>
<metadata tag="submitter" timestamp="Sat, 04 Apr 2009 13:56:36 +0000">
rbu
</metadata>
<metadata tag="bugReady" timestamp="Sat, 04 Apr 2009 13:57:02 +0000">
rbu
</metadata>
</glsa>