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<?xml version="1.0" encoding="utf-8"?>
<glsa id="201001-01">
<title>NTP: Denial of Service</title>
A Denial of Service condition in ntpd can cause excessive CPU or bandwidth
<product type="ebuild">ntp</product>
<announced>January 03, 2010</announced>
<revised>January 03, 2010: 01</revised>
<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>
NTP is a set of the Network Time Protocol programs.
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.
<impact type="normal">
A remote, unauthenticated attacker could send a specially crafted
MODE_PRIVATE packet, allowing for a Denial of Service condition (CPU
and bandwidth consumption).
There is no known workaround at this time.
All NTP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-misc/ntp-4.2.4_p7-r1&quot;</code>
<uri link="">CVE-2009-3563</uri>
<metadata tag="requester" timestamp="Thu, 10 Dec 2009 20:02:44 +0000">
<metadata tag="submitter" timestamp="Wed, 30 Dec 2009 15:53:37 +0000">
<metadata tag="bugReady" timestamp="Sun, 03 Jan 2010 00:05:58 +0000">