139 lines
5 KiB
Text
139 lines
5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-12:06.bind Security Advisory
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The FreeBSD Project
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Topic: Multiple Denial of Service vulnerabilities with named(8)
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Category: contrib
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Module: bind
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Announced: 2012-11-22
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Affects: All supported versions of FreeBSD before 9.1-RC2.
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Corrected: 2012-11-22 23:15:38 UTC (RELENG_7, 7.4-STABLE)
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2012-11-22 22:52:15 UTC (RELENG_7_4, 7.4-RELEASE-p11)
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2012-10-11 13:25:09 UTC (RELENG_8, 8.3-STABLE)
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2012-11-22 22:52:15 UTC (RELENG_8_3, 8.3-RELEASE-p5)
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2012-10-10 19:50:15 UTC (RELENG_9, 9.1-PRERELEASE)
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2012-11-22 22:52:15 UTC (RELENG_9_0, 9.0-RELEASE-p5)
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2012-11-22 22:52:15 UTC (RELENG_9_1, 9.1-RC1-p1)
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2012-11-22 22:52:15 UTC (RELENG_9_1, 9.1-RC2-p1)
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2012-11-22 22:52:15 UTC (RELENG_9_1, 9.1-RC3-p1)
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CVE Name: CVE-2012-4244, CVE-2012-5166
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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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The BIND daemon would crash when a query is made on a resource record
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with RDATA that exceeds 65535 bytes.
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The BIND daemon would lock up when a query is made on specific
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combinations of RDATA.
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III. Impact
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A remote attacker can query a resolving name server to retrieve a record
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whose RDATA is known to be larger than 65535 bytes, thereby causing the
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resolving server to crash via an assertion failure in named.
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An attacker who is in a position to add a record with RDATA larger than
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65535 bytes to an authoritative name server can cause that server to
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crash by later querying for that record.
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The attacker can also cause the server to lock up with specific
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combinations of RDATA.
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IV. Workaround
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No workaround is available, but systems not running the BIND name
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server are not affected.
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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, 8-STABLE, or 9-STABLE,
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or to the RELENG_7_4, RELENG_8_3, or RELENG_9_0 security branch dated
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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 7.4,
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8.3, and 9.0 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-12:06/bind.patch
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# fetch http://security.FreeBSD.org/patches/SA-12:06/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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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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3) To update your vulnerable system via a binary patch:
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Systems running 7.4-RELEASE, 8.3-RELEASE, 9.0-RELEASE, or 9.1-RC1 on
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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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4) Install and run BIND from the Ports Collection after the correction
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date. The following versions and newer versions of BIND installed from
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the Ports Collection are not affected by this vulnerability:
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bind96-9.6.3.1.ESV.R7.4
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bind97-9.7.6.4
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bind98-9.8.3.4
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bind99-9.9.1.4
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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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Subversion:
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/7/ r243418
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releng/7.4/ r243417
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stable/8/ r241443
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releng/8.3/ r243417
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stable/9/ r241415
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releng/9.0/ r243417
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releng/9.1/ r243417
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- -------------------------------------------------------------------------
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VII. References
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https://kb.isc.org/article/AA-00778
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https://kb.isc.org/article/AA-00801
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4244
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-5166
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-12:06.bind.asc
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