3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
148 lines
6 KiB
Text
148 lines
6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-10:02.ntpd Security Advisory
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The FreeBSD Project
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Topic: ntpd mode 7 denial of service
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Category: contrib
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Module: ntpd
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Announced: 2010-01-06
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Affects: All supported versions of FreeBSD.
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Corrected: 2010-01-06 21:45:30 UTC (RELENG_8, 8.0-STABLE)
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2010-01-06 21:45:30 UTC (RELENG_8_0, 8.0-RELEASE-p2)
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2010-01-06 21:45:30 UTC (RELENG_7, 7.2-STABLE)
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2010-01-06 21:45:30 UTC (RELENG_7_2, 7.2-RELEASE-p6)
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2010-01-06 21:45:30 UTC (RELENG_7_1, 7.1-RELEASE-p10)
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2010-01-06 21:45:30 UTC (RELENG_6, 6.4-STABLE)
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2010-01-06 21:45:30 UTC (RELENG_6_4, 6.4-RELEASE-p9)
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2010-01-06 21:45:30 UTC (RELENG_6_3, 6.3-RELEASE-p15)
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CVE Name: CVE-2009-3563
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:http://security.FreeBSD.org/>.
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I. Background
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The ntpd(8) daemon is an implementation of the Network Time Protocol (NTP)
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used to synchronize the time of a computer system to a reference time
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source.
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II. Problem Description
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If ntpd receives a mode 7 (MODE_PRIVATE) request or error response
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from a source address not listed in either a 'restrict ... noquery'
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or a 'restrict ... ignore' section it will log the even and send
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a mode 7 error response.
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III. Impact
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If an attacker can spoof such a packet from a source IP of an affected
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ntpd to the same or a different affected ntpd, the host(s) will endlessly
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send error responses to each other and log each event, consuming network
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bandwidth, CPU and possibly disk space.
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IV. Workaround
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Proper filtering of mode 7 NTP packets by a firewall can limit the
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number of systems used to attack your resources.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to 6-STABLE, 7-STABLE or 8-STABLE,
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or to the RELENG_8_0, RELENG_7_2, RELENG_7_1, RELENG_6_4, or
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RELENG_6_3 security branch dated after the correction date.
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2) To patch your present system:
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The following patches have been verified to apply to FreeBSD 6.3, 6.4,
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7.1, 7.2, and 8.0 systems.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch http://security.FreeBSD.org/patches/SA-10:02/ntpd.patch
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# fetch http://security.FreeBSD.org/patches/SA-10:02/ntpd.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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# cd /usr/src/usr.sbin/ntp/ntpd
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# make obj && make depend && make && make install
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# /etc/rc.d/ntpd restart
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VI. Correction details
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The following list contains the revision numbers of each file that was
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corrected in FreeBSD.
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CVS:
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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_6
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src/contrib/ntp/ntpd/ntp_request.c 1.1.1.4.8.2
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RELENG_6_4
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src/UPDATING 1.416.2.40.2.13
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src/sys/conf/newvers.sh 1.69.2.18.2.15
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src/contrib/ntp/ntpd/ntp_request.c 1.1.1.4.8.1.2.1
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RELENG_6_3
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src/UPDATING 1.416.2.37.2.20
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src/sys/conf/newvers.sh 1.69.2.15.2.19
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src/contrib/ntp/ntpd/ntp_request.c 1.1.1.4.20.1
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RELENG_7
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src/contrib/ntp/ntpd/ntp_request.c 1.1.1.4.18.2
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RELENG_7_2
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src/UPDATING 1.507.2.23.2.9
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src/sys/conf/newvers.sh 1.72.2.11.2.10
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src/contrib/ntp/ntpd/ntp_request.c 1.1.1.4.18.1.4.1
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RELENG_7_1
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src/UPDATING 1.507.2.13.2.13
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src/sys/conf/newvers.sh 1.72.2.9.2.14
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src/contrib/ntp/ntpd/ntp_request.c 1.1.1.4.18.1.2.1
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RELENG_8
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src/contrib/ntp/ntpd/ntp_request.c 1.2.2.1
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RELENG_8_0
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src/UPDATING 1.632.2.7.2.5
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src/sys/conf/newvers.sh 1.83.2.6.2.5
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src/contrib/ntp/ntpd/ntp_request.c 1.2.4.1
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- -------------------------------------------------------------------------
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Subversion:
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/6/ r201679
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releng/6.4/ r201679
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releng/6.3/ r201679
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stable/7/ r201679
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releng/7.2/ r201679
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releng/7.1/ r201679
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stable/8/ r201679
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releng/8.0/ r201679
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head/ r200576
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- -------------------------------------------------------------------------
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VII. References
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http://support.ntp.org/bin/view/Main/SecurityNotice#DoS_attack_from_certain_NTP_mode
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https://support.ntp.org/bugs/show_bug.cgi?id=1331
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http://www.kb.cert.org/vuls/id/568372
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-10:02.ntpd.asc
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