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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.0463 BIND remote denial of service 3 April 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: bind Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2013-2266 Reference: ESB-2013.0455 ESB-2013.0453 ESB-2013.0440 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-13:04.bind.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-13:04.bind Security Advisory The FreeBSD Project Topic: BIND remote denial of service Category: contrib Module: bind Announced: 2013-04-02 Credits: Matthew Horsfall of Dyn, Inc. Affects: FreeBSD 8.4-BETA1 and FreeBSD 9.x Corrected: 2013-03-28 05:35:46 UTC (stable/8, 8.4-BETA1) 2013-03-28 05:39:45 UTC (stable/9, 9.1-STABLE) 2013-04-02 17:34:42 UTC (releng/9.0, 9.0-RELEASE-p7) 2013-04-02 17:34:42 UTC (releng/9.1, 9.1-RELEASE-p2) CVE Name: CVE-2013-2266 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://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. The libdns library is a library of DNS protocol support functions. II. Problem Description A flaw in a library used by BIND allows an attacker to deliberately cause excessive memory consumption by the named(8) process. This affects both recursive and authoritative servers. III. Impact A remote attacker can cause the named(8) daemon to consume all available memory and crash, resulting in a denial of service. Applications linked with the libdns library, for instance dig(1), may also be affected. IV. Workaround No workaround is available, but systems not running named(8) service and not using base system DNS utilities are not affected. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch http://security.FreeBSD.org/patches/SA-13:04/bind.patch # fetch http://security.FreeBSD.org/patches/SA-13:04/bind.patch.asc # gpg --verify bind.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch Recompile the operating system using buildworld and installworld as described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>. Restart the named daemon, or reboot the system. 3) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch/path Revision - - ------------------------------------------------------------------------- stable/8/ r248807 stable/9/ r248808 releng/9.0/ r249029 releng/9.1/ r249029 - - ------------------------------------------------------------------------- VII. References https://kb.isc.org/article/AA-00871 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-2266 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-13:04.bind.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlFbGYYACgkQFdaIBMps37J4eACeNzJtWElzKJZCqXdzhrHEB+pu 1eoAn0oD7xcjoPOnB7H3xZbIeHldgGcI =BX1M - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. 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If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUVuf3u4yVqjM2NGpAQKjnBAAvRap3hYOvBTgyslujxLuYC41esdIJMoD tRkTa6I2nqwx57IBIjFuWxrLOhqZRyydtsOdubfQjF8wqvr57NKs7URejocGo71E 8/E9Z4brQ6aK4ZaNjtna9oyjN+bFVR20z8RX207xR8ExWB0y41UFtDGhvpZOIqiU br9//RNsNwZZvWcBzaQAiu10yUU0SIfzlqaprdTC83I/CnRiuoKRnqMiGlAsGx/6 j3H4C87kV8KBgHipkU9Fto3MOuiYFtr9dJ0d66gY36lTj6j2IcrxeZK53vnTdlhT UctlZwzFH8/4DewcUhaDfeGYGPrfSKJw4nlhzTL8CN6VkAn2/uMCQDSgUG0bASMj c1H3NogzVWPjYyIBM2jI6RzxGqRtJHgwoGcKmUK2Je0Mxo1m4vqFhaFl540DJaI/ xB5Gf5uJgcEfqOWKEjpljIIzA3ZULjpovmrUkBiPm8hFPouGkeuxWSqJ+fm55GmP bxifo9GYA31GdGEbjnI1Ld+6xSlbIQkv/J+L3C3Yj8aPfWfe3ixj5111kv6eLjgK MVerYc2pWiUPzK+c0qVaHFlITMacJwxYzzgHG7yR8WhvJGcaxd3Xn2/JGLazo4zG 0/SUyvWj7TFo0Ld9aIdMzk84vH2S80upb6DAtDon5AOt5eRxxAA/h5nMHgFTOLGj 55YXopLxIMs= =xR7Y -----END PGP SIGNATURE-----