<?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>2010-01-03</announced> <revised count="01">2010-01-03</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 ">=net-misc/ntp-4.2.4_p7-r1"</code> </resolution> <references> <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563">CVE-2009-3563</uri> </references> <metadata tag="requester" timestamp="2009-12-10T20:02:44Z"> craig </metadata> <metadata tag="submitter" timestamp="2009-12-30T15:53:37Z"> craig </metadata> <metadata tag="bugReady" timestamp="2010-01-03T00:05:58Z"> craig </metadata> </glsa>