163 lines
6 KiB
Text
163 lines
6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-17:03.ntp Security Advisory
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The FreeBSD Project
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Topic: Multiple vulnerabilities of ntp
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Category: contrib
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Module: ntp
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Announced: 2017-04-12
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Credits: Network Time Foundation
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Affects: All supported versions of FreeBSD.
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Corrected: 2017-03-28 04:48:17 UTC (stable/11, 11.0-STABLE)
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2017-04-12 06:24:35 UTC (releng/11.0, 11.0-RELEASE-p9)
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2017-03-28 04:48:55 UTC (stable/10, 10.3-STABLE)
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2017-04-12 06:24:35 UTC (releng/10.3, 10.3-RELEASE-p18)
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CVE Name: CVE-2017-6464, CVE-2017-6462, CVE-2017-6463, CVE-2016-9042
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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:https://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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A vulnerability was discovered in the NTP server's parsing of configuration
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directives. [CVE-2017-6464]
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A vulnerability was found in NTP, in the parsing of packets from the
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DPTS Clock. [CVE-2017-6462]
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A vulnerability was discovered in the NTP server's parsing of configuration
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directives. [CVE-2017-6463]
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A vulnerability was found in NTP, affecting the origin timestamp check
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function. [CVE-2016-9042]
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III. Impact
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A remote, authenticated attacker could cause ntpd to crash by sending a
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crafted message. [CVE-2017-6463, CVE-2017-6464]
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A malicious device could send crafted messages, causing ntpd to crash.
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[CVE-2017-6462]
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An attacker able to spoof messages from all of the configured peers
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could send crafted packets to ntpd, causing later replies from those
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peers to be discarded, resulting in denial of service. [CVE-2016-9042]
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IV. Workaround
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No workaround is available, but systems not running ntpd(8) are not
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affected. Network administrators are advised to implement BCP-38,
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which helps to reduce the risk associated with these attacks.
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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 a supported FreeBSD stable or
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release / security branch (releng) dated after the correction date.
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The ntpd service has to be restarted after the update. A reboot is
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recommended but not required.
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2) To update your vulnerable system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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The ntpd service has to be restarted after the update. A reboot is
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recommended but not required.
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3) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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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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[FreeBSD 11.0]
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# fetch https://security.FreeBSD.org/patches/SA-17:03/ntp-11.0.patch.xz
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# fetch https://security.FreeBSD.org/patches/SA-17:03/ntp-11.0.patch.xz.asc
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# gpg --verify ntp-11.0.patch.xz.asc
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[FreeBSD 10.3]
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# fetch https://security.FreeBSD.org/patches/SA-17:03/ntp-10.3.patch.xz
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# fetch https://security.FreeBSD.org/patches/SA-17:03/ntp-10.3.patch.xz.asc
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# gpg --verify ntp-10.3.patch.xz.asc
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b) Apply the patch. 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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c) Recompile the operating system using buildworld and installworld as
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described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
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Restart the applicable daemons, or reboot the system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/10/ r316069
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releng/10.3/ r316722
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stable/11/ r316068
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releng/11.0/ r316722
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9042>
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6462>
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6463>
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6464>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc>
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