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