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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201401-08">
<title>NTP: Traffic amplification</title>
<synopsis>NTP can be abused to amplify Denial of Service attack traffic.</synopsis>
<product type="ebuild"></product>
<announced>January 16, 2014</announced>
<revised>January 16, 2014: 1</revised>
<bug>496776</bug>
<access>remote</access>
<affected>
<package name="net-misc/ntp" auto="yes" arch="*">
<unaffected range="ge">4.2.6_p5-r10</unaffected>
<vulnerable range="lt">4.2.6_p5-r10</vulnerable>
</package>
</affected>
<background>
<p>NTP is a protocol designed to synchronize the clocks of computers over a
network. The net-misc/ntp package contains the official reference
implementation by the NTP Project.
</p>
</background>
<description>
<p>ntpd is susceptible to a reflected Denial of Service attack. Please
review the CVE identifiers and references below for details.
</p>
</description>
<impact type="normal">
<p>An unauthenticated remote attacker may conduct a distributed reflective
Denial of Service attack on another user via a vulnerable NTP server.
</p>
</impact>
<workaround>
<p>We modified the default ntp configuration in =net-misc/ntp-4.2.6_p5-r10
and added “noquery” to the default restriction which disallows anyone
to query the ntpd status, including “monlist”.
</p>
<p>If you use a non-default configuration, and provide a ntp service to
untrusted networks, we highly recommend you to revise your configuration
to disable mode 6 and 7 queries for any untrusted (public) network.
</p>
<p>You can always enable these queries for specific trusted networks. For
more details please see the “Access Control Support” chapter in the
ntp.conf(5) man page.
</p>
</workaround>
<resolution>
<p>All NTP users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=net-misc/ntp-4.2.6_p5-r10"
</code>
<p>Note that the updated package contains a modified default configuration
only. You may need to modify your configuration further.
</p>
</resolution>
<references>
<uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-5211">CVE-2013-5211</uri>
<uri link="http://www.kb.cert.org/vuls/id/348126">VU#348126</uri>
</references>
<metadata tag="requester" timestamp="Thu, 16 Jan 2014 20:55:36 +0000">
keytoaster
</metadata>
<metadata tag="submitter" timestamp="Thu, 16 Jan 2014 22:31:29 +0000">
keytoaster
</metadata>
</glsa>