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)
112 lines
3.9 KiB
Text
112 lines
3.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:12.bind9 Security Advisory
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The FreeBSD Project
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Topic: BIND 9 DNSSEC remote denial of service vulnerability
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Category: core
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Module: bind9
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Announced: 2005-06-09
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Credits: Internet Systems Consortium
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Affects: FreeBSD 5.3
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Corrected: 2005-03-23 18:16:29 UTC (RELENG_5, 5.3-STABLE)
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2005-06-08 21:29:15 UTC (RELENG_5_3, 5.3-RELEASE-p16)
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CVE Name: CAN-2005-0034
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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
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<URL:http://www.freebsd.org/security/>.
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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 the 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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DNSSEC is not enabled by default in any FreeBSD release. A system
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administrator must take special action to enable DNSSEC.
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II. Problem Description
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A DNSSEC-related validator function in BIND 9.3.0 contains an
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inappropriate internal consistency test. When this test is triggered,
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named(8) will exit.
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III. Impact
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On systems with DNSSEC enabled, a remote attacker may be able to inject
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a specially crafted packet that will cause the internal consistency test
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to trigger, and named(8) to terminate. As a result, the name server
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will no longer be available to service requests.
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IV. Workaround
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DNSSEC is not enabled by default, and the "dnssec-enable" directive is
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not normally present. If DNSSEC has been enabled, disable it by
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changing the "dnssec-enable" directive to "dnssec-enable no;" in the
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named.conf(5) configuration file.
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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 to the RELENG_5_3
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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 5.3
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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 ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:12/bind9.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:12/bind9.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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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/validator.c 1.1.1.1.2.2
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.19
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src/sys/conf/newvers.sh 1.62.2.15.2.21
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src/contrib/bind9/lib/dns/validator.c 1.1.1.1.2.1.2.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0034
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http://www.kb.cert.org/vuls/id/938617
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http://www.isc.org/index.pl?/sw/bind/bind-security.php
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http://www.isc.org/index.pl?/sw/bind/bind9.php
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The latest revision of this advisory is available at
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ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:12.bind9.asc
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