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[ GLSA 200908-02 ] BIND: Denial of Service
From: Alex Legler <a3li () gentoo org>
Date: Sat, 1 Aug 2009 22:04:23 +0200
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200908-02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: BIND: Denial of Service Date: August 01, 2009 Bugs: #279508 ID: 200908-02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Dynamic Update packets can cause a Denial of Service in the BIND daemon. Background ========== ISC BIND is the Internet Systems Consortium implementation of the Domain Name System (DNS) protocol. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/bind < 9.4.3_p3 >= 9.4.3_p3 Description =========== Matthias Urlichs reported that the dns_db_findrdataset() function fails when the prerequisite section of the dynamic update message contains a record of type "ANY" and where at least one RRset for this FQDN exists on the server. Impact ====== A remote unauthenticated attacker could send a specially crafted dynamic update message to the BIND daemon (named), leading to a Denial of Service (daemon crash). This vulnerability affects all primary (master) servers -- it is not limited to those that are configured to allow dynamic updates. Workaround ========== Configure a firewall that performs Deep Packet Inspection to prevent nsupdate messages from reaching named. Alternatively, expose only secondary (slave) servers to untrusted networks. Resolution ========== All BIND users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/bind-9.4.3_p3" References ========== [ 1 ] CVE-2009-0696 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0696 [ 2 ] ISC advisory https://www.isc.org/node/474 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200908-02.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security () gentoo org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2009 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5
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- [ GLSA 200908-02 ] BIND: Denial of Service Alex Legler (Aug 01)