| <?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 ">=net-misc/ntp-4.2.4_p7-r1"</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> |
