158 lines
6 KiB
Text
158 lines
6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-14:29.bind Security Advisory
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The FreeBSD Project
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Topic: BIND remote denial of service vulnerability
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Category: contrib
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Module: bind
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Announced: 2014-12-10
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Credits: ISC
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Affects: FreeBSD 8.4, 9.1, 9.2 and 9.3.
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Corrected: 2014-12-10 08:31:41 UTC (stable/9, 9.3-STABLE)
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2014-12-10 08:36:40 UTC (releng/9.3, 9.3-RELEASE-p6)
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2014-12-10 08:36:40 UTC (releng/9.2, 9.2-RELEASE-p16)
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2014-12-10 08:36:40 UTC (releng/9.1, 9.1-RELEASE-p23)
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2014-12-10 08:31:41 UTC (stable/8, 8.4-STABLE)
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2014-12-10 08:36:40 UTC (releng/8.4, 8.4-RELEASE-p20)
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CVE Name: CVE-2014-8500
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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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II. Problem Description
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By causing queries to be made against a maliciously-constructed zone or
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against a malicious DNS server, an attacker who is able to cause
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specific queries to be sent to a nameserver can cause named(8) to
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crash, leading to a denial of service.
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All recursive BIND DNS servers are vulnerable to this. Authoritative
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servers are only vulnerable if the attacker is able to control a
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delegation traversed by the authoritative server in order to serve
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the zone.
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III. Impact
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An attacker who can cause specific queries to be sent to a nameserver
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could cause named(8) to crash, resulting in a denial of service.
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IV. Workaround
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No workaround is available, but hosts not running named(8) are not
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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 a supported FreeBSD stable or
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release / security branch (releng) dated after the correction date.
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2) To update your vulnerable system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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3) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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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 9.3-RELEASE and 9.3-STABLE]
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind995.patch
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind995.patch.asc
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# gpg --verify bind995.patch.asc
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[FreeBSD 9.2-RELEASE]
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind984.patch
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind984.patch.asc
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# gpg --verify bind984.patch.asc
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[FreeBSD 9.1-RELEASE]
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind983.patch
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind983.patch.asc
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# gpg --verify bind983.patch.asc
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[FreeBSD 8.4-STABLE]
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind987.patch
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind987.patch.asc
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# gpg --verify bind987.patch.asc
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[FreeBSD 8.4-RELEASE]
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind984.patch
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# fetch http://security.FreeBSD.org/patches/SA-14:29/bind984.patch.asc
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# gpg --verify bind984.patch.asc
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b) Apply the patch. 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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c) Recompile the operating system using buildworld and installworld as
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described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.
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Restart the applicable daemons, or reboot the system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/8/ r275669
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releng/8.4/ r275672
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stable/9/ r275669
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releng/9.1/ r275672
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releng/9.2/ r275672
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releng/9.3/ r275672
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8500>
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The latest revision of this advisory is available at
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<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:29.bind.asc>
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