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)
152 lines
5.8 KiB
Text
152 lines
5.8 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-11:02.bind Security Advisory
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The FreeBSD Project
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Topic: BIND remote DoS with large RRSIG RRsets and negative caching
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Category: contrib
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Module: bind
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Announced: 2011-05-28
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Credits: Frank Kloeker, Michael Sinatra.
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Affects: All supported versions of FreeBSD.
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Corrected: 2011-05-28 00:58:19 UTC (RELENG_7, 7.4-STABLE)
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2011-05-28 08:44:39 UTC (RELENG_7_3, 7.3-RELEASE-p6)
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2011-05-28 08:44:39 UTC (RELENG_7_4, 7.4-RELEASE-p2)
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2011-05-28 00:33:06 UTC (RELENG_8, 8.2-STABLE)
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2011-05-28 08:44:39 UTC (RELENG_8_1, 8.1-RELEASE-p4)
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2011-05-28 08:44:39 UTC (RELENG_8_2, 8.2-RELEASE-p2)
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CVE Name: CVE-2011-1910
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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.
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DNS Security Extensions (DNSSEC) provides data integrity, origin
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authentication and authenticated denial of existence to resolvers.
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II. Problem Description
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Very large RRSIG RRsets included in a negative response can trigger
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an assertion failure that will crash named(8) due to an off-by-one error
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in a buffer size check.
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III. Impact
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If named(8) is being used as a recursive resolver, an attacker who
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controls a DNS zone being resolved can cause named(8) to crash,
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resulting in a denial of (DNS resolving) service.
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DNSSEC does not need to be enabled on the resolver for it to be
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vulnerable.
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IV. Workaround
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No workaround is available, but systems not running the BIND DNS server
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or using it exclusively as an authoritative name server (i.e., not as a
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caching resolver) are not vulnerable.
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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 7-STABLE or 8-STABLE,
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or to the RELENG_8_2, RELENG_8_1, RELENG_7_4, or RELENG_7_3
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security branch dated after the correction date.
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2) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to FreeBSD
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7.3, 7.4, 8.1 and 8.2 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-11:02/bind.patch
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# fetch http://security.FreeBSD.org/patches/SA-11:02/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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3) To update your vulnerable system via a binary patch:
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Systems running 7.3-RELEASE, 7.4-RELEASE, 8.1-RELEASE, or 8.2-RELEASE
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on the i386 or amd64 platforms can be updated via the freebsd-update(8)
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utility:
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# freebsd-update fetch
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# freebsd-update 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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CVS:
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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_7
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src/contrib/bind9/lib/dns/ncache.c 1.1.1.2.2.3
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RELENG_7_4
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src/UPDATING 1.507.2.36.2.4
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src/sys/conf/newvers.sh 1.72.2.18.2.7
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src/contrib/bind9/lib/dns/ncache.c 1.1.1.2.2.2.2.1
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RELENG_7_3
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src/UPDATING 1.507.2.34.2.8
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src/sys/conf/newvers.sh 1.72.2.16.2.10
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src/contrib/bind9/lib/dns/ncache.c 1.1.1.2.10.1
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RELENG_8
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src/contrib/bind9/lib/dns/ncache.c 1.2.2.4
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RELENG_8_2
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src/UPDATING 1.632.2.19.2.4
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src/sys/conf/newvers.sh 1.83.2.12.2.7
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src/contrib/bind9/lib/dns/ncache.c 1.2.2.2.2.1
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RELENG_8_1
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src/UPDATING 1.632.2.14.2.7
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src/sys/conf/newvers.sh 1.83.2.10.2.8
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src/contrib/bind9/lib/dns/ncache.c 1.2.2.1.2.1
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- -------------------------------------------------------------------------
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Subversion:
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/7/ r222399
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releng/7.4/ r222416
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releng/7.3/ r222416
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stable/8/ r222396
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releng/8.2/ r222416
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releng/8.1/ r222416
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head/ r222395
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- -------------------------------------------------------------------------
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VII. References
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http://www.isc.org/software/bind/advisories/cve-2011-1910
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1910
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-11:02.bind.asc
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