glsa-201001-01.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="201001-01">
  <title>NTP: Denial of Service</title>
  <synopsis>
    A Denial of Service condition in ntpd can cause excessive CPU or bandwidth
    consumption.
  </synopsis>
  <product type="ebuild">ntp</product>
  <announced>January 03, 2010</announced>
  <revised>January 03, 2010: 01</revised>
  <bug>290881</bug>
  <access>remote</access>
  <affected>
    <package name="net-misc/ntp" auto="yes" arch="*">
      <unaffected range="ge">4.2.4_p7-r1</unaffected>
      <vulnerable range="lt">4.2.4_p7-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    NTP is a set of the Network Time Protocol programs.
    </p>
  </background>
  <description>
    <p>
    Robin Park and Dmitri Vinokurov discovered that ntp_request.c in ntpd
    does not handle MODE_PRIVATE packets correctly, causing a continuous
    exchange of MODE_PRIVATE error responses between two NTP daemons or
    causing high CPU load on a single host.
    </p>
  </description>
  <impact type="normal">
    <p>
    A remote, unauthenticated attacker could send a specially crafted
    MODE_PRIVATE packet, allowing for a Denial of Service condition (CPU
    and bandwidth consumption).
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All NTP users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=net-misc/ntp-4.2.4_p7-r1&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563">CVE-2009-3563</uri>
  </references>
  <metadata tag="requester" timestamp="Thu, 10 Dec 2009 20:02:44 +0000">
    craig
  </metadata>
  <metadata tag="submitter" timestamp="Wed, 30 Dec 2009 15:53:37 +0000">
    craig
  </metadata>
  <metadata tag="bugReady" timestamp="Sun, 03 Jan 2010 00:05:58 +0000">
    craig
  </metadata>
</glsa>