glsa-200904-10.xml


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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>2009-04-08</announced>
  <revised count="01">2009-04-08</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 "&gt;=net-dns/avahi-0.6.24-r2"</code>
  </resolution>
  <references>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0758">CVE-2009-0758</uri>
  </references>
  <metadata tag="requester" timestamp="2009-04-04T13:49:21Z">
    rbu
  </metadata>
  <metadata tag="submitter" timestamp="2009-04-04T13:56:36Z">
    rbu
  </metadata>
  <metadata tag="bugReady" timestamp="2009-04-04T13:57:02Z">
    rbu
  </metadata>
</glsa>