FreeBSD Security Advisory - BIND 9 is an implementation of the Domain Name System (DNS) protocols. The named(8) daemon is an Internet Domain Name Server. DNS Security Extensions (DNSSEC) provides data integrity, origin authentication and authenticated denial of existence to resolvers. If a client requests DNSSEC records with the Checking Disabled (CD) flag set, BIND may cache the unvalidated responses. These responses may later be returned to another client that has not set the CD flag.
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FreeBSD-SA-10:01.bind Security Advisory
The FreeBSD Project
Topic: BIND named(8) cache poisoning with DNSSEC validation
Category: contrib
Module: bind
Announced: 2010-01-06
Credits: Michael Sinatra
Affects: All supported versions of FreeBSD.
Corrected: 2009-12-11 01:23:58 UTC (RELENG_8, 8.0-STABLE)
2010-01-06 21:45:30 UTC (RELENG_8_0, 8.0-RELEASE-p2)
2009-12-11 02:23:04 UTC (RELENG_7, 7.2-STABLE)
2010-01-06 21:45:30 UTC (RELENG_7_2, 7.2-RELEASE-p6)
2010-01-06 21:45:30 UTC (RELENG_7_1, 7.1-RELEASE-p10)
2010-01-06 21:45:30 UTC (RELENG_6, 6.4-STABLE)
2010-01-06 21:45:30 UTC (RELENG_6_4, 6.4-RELEASE-p9)
2010-01-06 21:45:30 UTC (RELENG_6_3, 6.3-RELEASE-p15)
CVE Name: CVE-2009-4022
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.
I. Background
BIND 9 is an implementation of the Domain Name System (DNS) protocols.
The named(8) daemon is an Internet Domain Name Server.
DNS Security Extensions (DNSSEC) provides data integrity, origin
authentication and authenticated denial of existence to resolvers.
II. Problem Description
If a client requests DNSSEC records with the Checking Disabled (CD) flag
set, BIND may cache the unvalidated responses. These responses may later
be returned to another client that has not set the CD flag.
III. Impact
If a client can send such queries to a server, it can exploit this
problem to mount a cache poisoning attack, seeding the cache with
unvalidated information.
IV. Workaround
Disabling DNSSEC validation will prevent BIND from caching unvalidated
records, but also prevent DNSSEC authentication of records. Systems not
using DNSSEC validation are not affected.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 6-STABLE, 7-STABLE or 8-STABLE,
or to the RELENG_8_0, RELENG_7_2, RELENG_7_1, RELENG_6_4, or
RELENG_6_3 security branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 6.3, 6.4,
7.1, 7.2, and 8.0 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
[FreeBSD 6.3]
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-63.patch
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-63.patch.asc
[FreeBSD 6.4]
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-64.patch
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-64.patch.asc
[FreeBSD 7.1]
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-71.patch
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-71.patch.asc
[FreeBSD 7.2]
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-72.patch
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-72.patch.asc
[FreeBSD 8.0]
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-80.patch
# fetch https://security.FreeBSD.org/patches/SA-10:01/bind9-80.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/bind
# make obj && make depend && make && make install
# cd /usr/src/usr.sbin/named
# make obj && make depend && make && make install
# /etc/rc.d/named restart
NOTE WELL: Users running FreeBSD 6 and using DNSSEC are advised to get
a more recent BIND version with more complete DNSSEC support. This
can be done either by upgrading to FreeBSD 7.x or later, or installing
BIND for the FreeBSD Ports Collection.
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
CVS:
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_6
src/contrib/bind9/lib/dns/rbtdb.c 1.1.1.1.4.4
src/contrib/bind9/lib/dns/include/dns/types.h 1.1.1.1.4.2
src/contrib/bind9/lib/dns/resolver.c 1.1.1.2.2.11
src/contrib/bind9/lib/dns/masterdump.c 1.1.1.1.4.3
src/contrib/bind9/lib/dns/validator.c 1.1.1.2.2.6
src/contrib/bind9/bin/named/query.c 1.1.1.1.4.7
RELENG_6_4
src/UPDATING 1.416.2.40.2.13
src/sys/conf/newvers.sh 1.69.2.18.2.15
src/contrib/bind9/lib/dns/rbtdb.c 1.1.1.1.4.3.2.1
src/contrib/bind9/lib/dns/include/dns/types.h 1.1.1.1.4.1.4.1
src/contrib/bind9/lib/dns/resolver.c 1.1.1.2.2.9.2.1
src/contrib/bind9/lib/dns/masterdump.c 1.1.1.1.4.1.4.1
src/contrib/bind9/lib/dns/validator.c 1.1.1.2.2.4.2.1
src/contrib/bind9/bin/named/query.c 1.1.1.1.4.5.2.1
RELENG_6_3
src/UPDATING 1.416.2.37.2.20
src/sys/conf/newvers.sh 1.69.2.15.2.19
src/contrib/bind9/lib/dns/rbtdb.c 1.1.1.1.4.2.2.1
src/contrib/bind9/lib/dns/include/dns/types.h 1.1.1.1.4.1.2.1
src/contrib/bind9/lib/dns/resolver.c 1.1.1.2.2.6.2.2
src/contrib/bind9/lib/dns/masterdump.c 1.1.1.1.4.1.2.1
src/contrib/bind9/lib/dns/validator.c 1.1.1.2.2.3.2.1
src/contrib/bind9/bin/named/query.c 1.1.1.1.4.4.2.1
RELENG_7
src/contrib/bind9/lib/dns/rbtdb.c 1.1.1.4.2.4
src/contrib/bind9/lib/dns/include/dns/types.h 1.1.1.3.2.2
src/contrib/bind9/lib/dns/resolver.c 1.1.1.9.2.6
src/contrib/bind9/lib/dns/masterdump.c 1.1.1.3.2.3
src/contrib/bind9/lib/dns/validator.c 1.1.1.6.2.5
src/contrib/bind9/bin/named/query.c 1.1.1.6.2.4
RELENG_7_2
src/UPDATING 1.507.2.23.2.9
src/sys/conf/newvers.sh 1.72.2.11.2.10
src/contrib/bind9/lib/dns/rbtdb.c 1.1.1.4.2.2.2.1
src/contrib/bind9/lib/dns/include/dns/types.h 1.1.1.3.8.1
src/contrib/bind9/lib/dns/resolver.c 1.1.1.9.2.4.2.1
src/contrib/bind9/lib/dns/masterdump.c 1.1.1.3.2.1.2.1
src/contrib/bind9/lib/dns/validator.c 1.1.1.6.2.3.2.1
src/contrib/bind9/bin/named/query.c 1.1.1.6.2.2.2.1
RELENG_7_1
src/UPDATING 1.507.2.13.2.13
src/sys/conf/newvers.sh 1.72.2.9.2.14
src/contrib/bind9/lib/dns/rbtdb.c 1.1.1.4.2.1.4.1
src/contrib/bind9/lib/dns/include/dns/types.h 1.1.1.3.6.1
src/contrib/bind9/lib/dns/resolver.c 1.1.1.9.2.3.2.1
src/contrib/bind9/lib/dns/masterdump.c 1.1.1.3.6.1
src/contrib/bind9/lib/dns/validator.c 1.1.1.6.2.1.4.1
src/contrib/bind9/bin/named/query.c 1.1.1.6.2.1.4.1
RELENG_8
src/contrib/bind9/lib/dns/rbtdb.c 1.3.2.2
src/contrib/bind9/lib/dns/include/dns/types.h 1.2.2.2
src/contrib/bind9/lib/dns/resolver.c 1.6.2.2
src/contrib/bind9/lib/dns/masterdump.c 1.3.2.2
src/contrib/bind9/lib/dns/validator.c 1.4.2.2
src/contrib/bind9/bin/named/query.c 1.3.2.2
RELENG_8_0
src/UPDATING 1.632.2.7.2.5
src/sys/conf/newvers.sh 1.83.2.6.2.5
src/contrib/bind9/lib/dns/rbtdb.c 1.3.4.1
src/contrib/bind9/lib/dns/include/dns/types.h 1.2.4.1
src/contrib/bind9/lib/dns/resolver.c 1.6.4.1
src/contrib/bind9/lib/dns/masterdump.c 1.3.4.1
src/contrib/bind9/lib/dns/validator.c 1.4.4.1
src/contrib/bind9/bin/named/query.c 1.3.4.1
- -------------------------------------------------------------------------
Subversion:
Branch/path Revision
- -------------------------------------------------------------------------
stable/6/ r200394
releng/6.4/ r201679
releng/6.3/ r201679
stable/7/ r200393
releng/7.2/ r201679
releng/7.1/ r201679
stable/8/ r200383
releng/8.0/ r201679
head/ r199958
- -------------------------------------------------------------------------
VII. References
https://www.isc.org/node/504
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4022
The latest revision of this advisory is available at
https://security.FreeBSD.org/advisories/FreeBSD-SA-10:01.bind.asc
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