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)
144 lines
5.6 KiB
Text
144 lines
5.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-07:02.bind Security Advisory
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The FreeBSD Project
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Topic: Multiple Denial of Service vulnerabilities in named(8)
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Category: contrib
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Module: bind
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Announced: 2007-02-09
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Affects: FreeBSD 5.3 and later.
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Corrected: 2007-02-07 00:42:09 UTC (RELENG_6, 6.2-STABLE)
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2007-02-09 20:24:15 UTC (RELENG_6_2, 6.2-RELEASE-p1)
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2007-02-09 20:23:29 UTC (RELENG_6_1, 6.1-RELEASE-p13)
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2007-02-07 00:46:35 UTC (RELENG_5, 5.5-STABLE)
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2007-02-09 20:22:44 UTC (RELENG_5_5, 5.5-RELEASE-p11)
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CVE Name: CVE-2007-0493, CVE-2007-0494
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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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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. DNS Security
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Extensions (DNSSEC) are additional protocol options that add
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authentication and integrity to the DNS protocols.
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II. Problem Description
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A type * (ANY) query response containing multiple RRsets can trigger an
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assertion failure.
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Certain recursive queries can cause the nameserver to crash by using memory
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which has already been freed.
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III. Impact
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A remote attacker sending a type * (ANY) query to an authoritative DNS
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server for a DNSSEC signed zone can cause the named(8) daemon to exit,
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resulting in a Denial of Service.
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A remote attacker sending recursive queries can cause the nameserver to
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crash, resulting in a Denial of Service.
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IV. Workaround
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There is no workaround available, but systems which are not authoritative
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servers for DNSSEC signed zones are not affected by the first issue; and
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systems which do not permit untrusted users to perform recursive DNS
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resolution are not affected by the second issue. Note that the default
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configuration for named(8) in FreeBSD allows local access only (which on
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many systems is equivalent to refusing access to untrusted users).
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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 5-STABLE, or 6-STABLE, or to the
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RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
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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 5.5, 6.1,
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and 6.2 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 5.5, FreeBSD 6.1]
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# fetch http://security.FreeBSD.org/patches/SA-07:02/bind61.patch
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# fetch http://security.FreeBSD.org/patches/SA-07:02/bind61.patch.asc
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[FreeBSD 6.2]
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# fetch http://security.FreeBSD.org/patches/SA-07:02/bind62.patch
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# fetch http://security.FreeBSD.org/patches/SA-07:02/bind62.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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c) Restart the named application:
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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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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_5
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src/contrib/bind9/lib/dns/resolver.c 1.1.1.1.2.8
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src/contrib/bind9/lib/dns/validator.c 1.1.1.1.2.5
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src/contrib/bind9/lib/dns/include/dns/validator.h 1.1.1.1.2.4
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RELENG_5_5
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src/UPDATING 1.342.2.35.2.11
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src/sys/conf/newvers.sh 1.62.2.21.2.13
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src/contrib/bind9/lib/dns/resolver.c 1.1.1.1.2.4.2.2
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src/contrib/bind9/lib/dns/validator.c 1.1.1.1.2.3.2.1
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src/contrib/bind9/lib/dns/include/dns/validator.h 1.1.1.1.2.2.2.1
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RELENG_6
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src/contrib/bind9/lib/dns/resolver.c 1.1.1.2.2.6
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src/contrib/bind9/lib/dns/validator.c 1.1.1.2.2.3
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src/contrib/bind9/lib/dns/include/dns/validator.h 1.1.1.1.4.3
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RELENG_6_2
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src/UPDATING 1.416.2.29.2.4
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src/sys/conf/newvers.sh 1.69.2.13.2.4
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src/contrib/bind9/lib/dns/resolver.c 1.1.1.2.2.4.2.2
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src/contrib/bind9/lib/dns/validator.c 1.1.1.2.2.1.4.2
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src/contrib/bind9/lib/dns/include/dns/validator.h 1.1.1.1.4.1.4.2
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RELENG_6_1
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src/UPDATING 1.416.2.22.2.15
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src/sys/conf/newvers.sh 1.69.2.11.2.15
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src/contrib/bind9/lib/dns/resolver.c 1.1.1.2.2.2.2.2
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src/contrib/bind9/lib/dns/validator.c 1.1.1.2.2.1.2.1
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src/contrib/bind9/lib/dns/include/dns/validator.h 1.1.1.1.4.1.2.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0493
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0494
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-07:02.bind.asc
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