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)
153 lines
5.9 KiB
Text
153 lines
5.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-09:12.bind Security Advisory
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The FreeBSD Project
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Topic: BIND named(8) dynamic update message remote DoS
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Category: contrib
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Module: bind
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Announced: 2009-07-29
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Credits: Matthias Urlichs
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Affects: All supported versions of FreeBSD
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Corrected: 2009-07-28 23:59:22 UTC (RELENG_7, 7.2-STABLE)
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2009-07-29 00:14:14 UTC (RELENG_7_2, 7.2-RELEASE-p3)
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2009-07-29 00:14:14 UTC (RELENG_7_1, 7.1-RELEASE-p7)
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2009-07-29 00:13:47 UTC (RELENG_6, 6.4-STABLE)
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2009-07-29 00:14:14 UTC (RELENG_6_4, 6.4-RELEASE-p6)
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2009-07-29 00:14:14 UTC (RELENG_6_3, 6.3-RELEASE-p12)
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CVE Name: CVE-2009-0696
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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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NOTE: Due to this issue being accidentally disclosed early, updated
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binaries are yet not available via freebsd-update at the time this
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advisory is being published. Email will be sent to the freebsd-security
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mailing list when the binaries are available via freebsd-update.
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I. Background
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BIND 9 is an implementation of the Domain Name System (DNS) protocols.
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The named(8) daemon is an Internet Domain Name Server.
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Dynamic update messages may be used to update records in a master zone
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on a nameserver.
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II. Problem Description
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When named(8) receives a specially crafted dynamic update message an
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internal assertion check is triggered which causes named(8) to exit.
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To trigger the problem, the dynamic update message must contains a
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record of type "ANY" and at least one resource record set (RRset) for
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this fully qualified domain name (FQDN) must exist on the server.
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III. Impact
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An attacker which can send DNS requests to a nameserver can cause it to
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exit, thus creating a Denial of Service situation.
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IV. Workaround
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No generally applicable workaround is available, but some firewalls
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may be able to prevent nsupdate DNS packets from reaching the
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nameserver.
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NOTE WELL: Merely configuring named(8) to ignore dynamic updates is NOT
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sufficient to protect it from this vulnerability.
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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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# fetch http://security.FreeBSD.org/patches/SA-09:12/bind.patch
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# fetch http://security.FreeBSD.org/patches/SA-09:12/bind.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/lib/bind
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# make obj && make depend && make && make install
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# cd /usr/src/usr.sbin/named
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# make obj && make depend && make && make install
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# /etc/rc.d/named 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/bind9/bin/named/update.c 1.1.1.2.2.5
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RELENG_6_4
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src/UPDATING 1.416.2.40.2.10
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src/sys/conf/newvers.sh 1.69.2.18.2.12
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src/contrib/bind9/bin/named/update.c 1.1.1.2.2.3.2.1
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RELENG_6_3
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src/UPDATING 1.416.2.37.2.17
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src/sys/conf/newvers.sh 1.69.2.15.2.16
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src/contrib/bind9/bin/named/update.c 1.1.1.2.2.2.2.1
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RELENG_7
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src/contrib/bind9/bin/named/update.c 1.1.1.5.2.3
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RELENG_7_2
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src/UPDATING 1.507.2.23.2.6
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src/sys/conf/newvers.sh 1.72.2.11.2.7
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src/contrib/bind9/bin/named/update.c 1.1.1.5.2.2.2.1
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RELENG_7_1
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src/UPDATING 1.507.2.13.2.10
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src/sys/conf/newvers.sh 1.72.2.9.2.11
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src/contrib/bind9/bin/named/update.c 1.1.1.5.2.1.4.1
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HEAD
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src/contrib/bind9/bin/named/update.c 1.4
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- -------------------------------------------------------------------------
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Subversion:
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Branch/path Revision
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- -------------------------------------------------------------------------
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head/ r195936
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stable/6/ r195934
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releng/6.4/ r195935
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releng/6.3/ r195935
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stable/7/ r195933
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releng/7.2/ r195935
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releng/7.1/ r195935
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- -------------------------------------------------------------------------
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VII. References
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https://www.isc.org/node/474
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http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=538975
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0696
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-09:12.bind.asc
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