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)
127 lines
4.9 KiB
Text
127 lines
4.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-07:07.bind Security Advisory
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The FreeBSD Project
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Topic: Predictable query ids in named(8)
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Category: contrib
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Module: bind
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Announced: 2007-08-01
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Credits: Amit Klein
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Affects: FreeBSD 5.3 and later.
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Corrected: 2007-07-25 08:23:08 UTC (RELENG_6, 6.2-STABLE)
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2007-08-01 20:44:58 UTC (RELENG_6_2, 6.2-RELEASE-p7)
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2007-08-01 20:45:49 UTC (RELENG_6_1, 6.1-RELEASE-p19)
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2007-07-25 08:24:40 UTC (RELENG_5, 5.5-STABLE)
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2007-08-01 20:48:19 UTC (RELENG_5_5, 5.5-RELEASE-p15)
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CVE Name: CVE-2007-2926
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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 requests
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contain a query id which is used match a DNS request with the response
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and to make it harder for anybody but the DNS server which received the
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request to send a valid response.
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II. Problem Description
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When named(8) is operating as a recursive DNS server or sending NOTIFY
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requests to slave DNS servers, named(8) uses a predictable query id.
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III. Impact
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An attacker who can see the query id for some request(s) sent by named(8)
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is likely to be able to perform DNS cache poisoning by predicting the
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query id for other request(s).
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IV. Workaround
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No workaround is available.
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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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# fetch http://security.FreeBSD.org/patches/SA-07:07/bind.patch
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# fetch http://security.FreeBSD.org/patches/SA-07:07/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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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/bin/named/client.c 1.1.1.1.2.5
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src/contrib/bind9/lib/dns/dispatch.c 1.1.1.1.2.3
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src/contrib/bind9/lib/dns/include/dns/dispatch.h 1.1.1.1.2.2
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RELENG_5_5
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src/UPDATING 1.342.2.35.2.15
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src/sys/conf/newvers.sh 1.62.2.21.2.17
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src/contrib/bind9/bin/named/client.c 1.1.1.1.2.3.2.1
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src/contrib/bind9/lib/dns/dispatch.c 1.1.1.1.2.1.6.1
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src/contrib/bind9/lib/dns/include/dns/dispatch.h 1.1.1.1.2.1.6.1
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RELENG_6
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src/contrib/bind9/bin/named/client.c 1.1.1.2.2.3
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src/contrib/bind9/lib/dns/dispatch.c 1.1.1.1.4.2
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src/contrib/bind9/lib/dns/include/dns/dispatch.h 1.1.1.1.4.1
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RELENG_6_2
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src/UPDATING 1.416.2.29.2.10
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src/sys/conf/newvers.sh 1.69.2.13.2.10
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src/contrib/bind9/bin/named/client.c 1.1.1.2.2.1.4.2
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src/contrib/bind9/lib/dns/dispatch.c 1.1.1.1.10.2
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src/contrib/bind9/lib/dns/include/dns/dispatch.h 1.1.1.1.10.1
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RELENG_6_1
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src/UPDATING 1.416.2.22.2.21
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src/sys/conf/newvers.sh 1.69.2.11.2.21
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src/contrib/bind9/bin/named/client.c 1.1.1.2.2.1.2.1
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src/contrib/bind9/lib/dns/dispatch.c 1.1.1.1.8.1
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src/contrib/bind9/lib/dns/include/dns/dispatch.h 1.1.1.1.8.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2926
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http://www.isc.org/sw/bind/bind-security.php
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http://www.trusteer.com/docs/bind9dns_s.html
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-07:07.bind.asc
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