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72 lines
2.6 KiB
72 lines
2.6 KiB
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="201401-08">
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<title>NTP: Traffic amplification</title>
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<synopsis>NTP can be abused to amplify Denial of Service attack traffic.</synopsis>
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<product type="ebuild"/>
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<announced>2014-01-16</announced>
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<revised count="1">2014-01-16</revised>
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<bug>496776</bug>
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<access>remote</access>
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<affected>
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<package name="net-misc/ntp" auto="yes" arch="*">
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<unaffected range="ge">4.2.6_p5-r10</unaffected>
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<vulnerable range="lt">4.2.6_p5-r10</vulnerable>
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</package>
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</affected>
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<background>
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<p>NTP is a protocol designed to synchronize the clocks of computers over a
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network. The net-misc/ntp package contains the official reference
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implementation by the NTP Project.
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</p>
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</background>
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<description>
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<p>ntpd is susceptible to a reflected Denial of Service attack. Please
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review the CVE identifiers and references below for details.
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</p>
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</description>
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<impact type="normal">
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<p>An unauthenticated remote attacker may conduct a distributed reflective
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Denial of Service attack on another user via a vulnerable NTP server.
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</p>
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</impact>
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<workaround>
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<p>We modified the default ntp configuration in =net-misc/ntp-4.2.6_p5-r10
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and added “noquery” to the default restriction which disallows anyone
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to query the ntpd status, including “monlist”.
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</p>
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<p>If you use a non-default configuration, and provide a ntp service to
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untrusted networks, we highly recommend you to revise your configuration
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to disable mode 6 and 7 queries for any untrusted (public) network.
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</p>
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<p>You can always enable these queries for specific trusted networks. For
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more details please see the “Access Control Support” chapter in the
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ntp.conf(5) man page.
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</p>
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</workaround>
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<resolution>
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<p>All NTP users should upgrade to the latest version:</p>
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<code>
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# emerge --sync
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# emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.6_p5-r10"
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</code>
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<p>Note that the updated package contains a modified default configuration
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only. You may need to modify your configuration further.
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</p>
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</resolution>
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<references>
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<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-5211">CVE-2013-5211</uri>
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<uri link="https://www.kb.cert.org/vuls/id/348126">VU#348126</uri>
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</references>
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<metadata tag="requester" timestamp="2014-01-16T20:55:36Z">
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keytoaster
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</metadata>
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<metadata tag="submitter" timestamp="2014-01-16T22:31:29Z">
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keytoaster
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</metadata>
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</glsa>
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