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)
145 lines
5.5 KiB
Text
145 lines
5.5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-09:11.ntpd Security Advisory
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The FreeBSD Project
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Topic: ntpd stack-based buffer-overflow vulnerability
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Category: contrib
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Module: ntpd
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Announced: 2009-06-10
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Credits: Chris Ries
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Affects: All supported versions of FreeBSD.
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Corrected: 2009-06-10 10:31:11 UTC (RELENG_7, 7.2-STABLE)
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2009-06-10 10:31:11 UTC (RELENG_7_2, 7.2-RELEASE-p1)
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2009-06-10 10:31:11 UTC (RELENG_7_1, 7.1-RELEASE-p6)
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2009-06-10 10:31:11 UTC (RELENG_6, 6.4-STABLE)
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2009-06-10 10:31:11 UTC (RELENG_6_4, 6.4-RELEASE-p5)
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2009-06-10 10:31:11 UTC (RELENG_6_3, 6.3-RELEASE-p11)
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CVE Name: CVE-2009-1252
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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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Autokey is a security model for authenticating Network Time Protocol
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(NTP) servers to clients, using public key cryptography.
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II. Problem Description
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The ntpd(8) daemon is prone to a stack-based buffer-overflow when it is
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configured to use the 'autokey' security model.
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III. Impact
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This issue could be exploited to execute arbitrary code in the context of
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the service daemon, or crash the service daemon, causing denial-of-service
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conditions.
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IV. Workaround
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Use IP based restrictions in ntpd(8) itself or in IP firewalls to
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restrict which systems can send NTP packets to ntpd(8).
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Note that systems will only be affected if they have the "autokey" option
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set in /etc/ntp.conf; FreeBSD does not ship with a default ntp.conf file,
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so will not be affected unless this option has been explicitly enabled by
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the system administrator.
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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, or 7-STABLE, or to the
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RELENG_7_2, RELENG_7_1, RELENG_6_4, or RELENG_6_3 security branch
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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, and 7.2 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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[FreeBSD 6.3]
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# fetch http://security.FreeBSD.org/patches/SA-09:11/ntpd63.patch
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# fetch http://security.FreeBSD.org/patches/SA-09:11/ntpd63.patch.asc
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[FreeBSD 6.4 and 7.x]
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# fetch http://security.FreeBSD.org/patches/SA-09:11/ntpd.patch
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# fetch http://security.FreeBSD.org/patches/SA-09:11/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_crypto.c 1.1.1.3.8.3
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RELENG_6_4
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src/UPDATING 1.416.2.40.2.9
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src/sys/conf/newvers.sh 1.69.2.18.2.11
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src/contrib/ntp/ntpd/ntp_crypto.c 1.1.1.3.8.1.2.2
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RELENG_6_3
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src/UPDATING 1.416.2.37.2.16
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src/sys/conf/newvers.sh 1.69.2.15.2.15
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src/contrib/ntp/ntpd/ntp_crypto.c 1.1.1.3.20.2
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RELENG_7
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src/contrib/ntp/ntpd/ntp_crypto.c 1.1.1.3.18.3
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RELENG_7_2
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src/UPDATING 1.507.2.23.2.4
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src/sys/conf/newvers.sh 1.72.2.11.2.5
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src/contrib/ntp/ntpd/ntp_crypto.c 1.1.1.3.18.2.2.1
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RELENG_7_1
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src/UPDATING 1.507.2.13.2.9
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src/sys/conf/newvers.sh 1.72.2.9.2.10
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src/contrib/ntp/ntpd/ntp_crypto.c 1.1.1.3.18.1.2.2
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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/ r193893
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releng/6.4/ r193893
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releng/6.3/ r193893
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stable/7/ r193893
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releng/7.2/ r193893
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releng/7.1/ r193893
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1252
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-09:11.ntpd.asc
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