__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Multiple DoS Vulnerabilities in the BIND 9 Software [NISCC Vulnerability Advisory 172003/NISCC/BIND9] September 7, 2006 12:00 GMT Number Q-303 [REVISED 11 Sept 2006] ______________________________________________________________________________ PROBLEM: Two vulnerabilities have been discovered that affects various versions of BIND 9. PLATFORM: BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3b1, 9.3.3rc1, 9.4.0a1, 9.4.0a2, 9.4.0a4, 9.4.0a5, 9.4.0a6, 9.4.0b1 DAMAGE: If exploited, these vulnerabilities could potentially lead to a denial-of-service (DoS) condition. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. If exploited, these vulnerabilities could ASSESSMENT: potentially lead to a denial-of-service (DoS) condition. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/q-303.shtml ORIGINAL BULLETIN: NISCC Vulnerability Adivsory 172003/NISCC/BIND9 http://www.niscc.gov.uk/niscc/docs/re-20060905-00590.pdf?lang=en ADDITIONAL LINKS: US-CERT Vulnerability Note VU#915404 http://www.kb.cert.org/vuls/id/915404 US-CERT Vulnerability Note VU#697164 http://www.kb.cert.org/vuls/id/697164 Debian Security Advisory 1172-1 http://www.debian.org/security/2006/dsa-1172 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4095 ______________________________________________________________________________ REVISION HISTORY: 09/11/06 - added link to Debian Security Advisory 1172-1 [***** Start NISCC Vulnerability Advisory 172003/NISCC/BIND9 *****] NISCC Vulnerability Advisory 172003/NISCC/BIND9 Multiple DoS Vulnerabilities in the BIND 9 Software Version Information Advisory Reference 172003/NISCC/BIND9 Release Date 5 September 2006 Last Revision 5 September 2006 Version Number 1.0 Acknowledgement These vulnerabilities were reported to NISCC by Internet Systems Consortium (ISC). What is Affected? The following products are affected: - BIND 9.3.0, BIND 9.3.1, BIND 9.3.2, BIND 9.3.3b1 and BIND 9.3.3rc1 - BIND 9.4.0a1, 9.4.0a2, 9.4.0a3, 9.4.0a4, 9.4.0a5, 9.4.0a6 and 9.4.0b1 Please note that although ISC has not been able to replicate these vulnerabilities in BIND 9.2.x, a patch is provided nonetheless. Impact If exploited, these vulnerabilities could potentially lead to a denialof-service (DoS) condition. Severity High Summary BIND (Berkeley Internet Name Domain, and previously known as Berkeley Internet Name Daemon) is one of the most commonly used DNS servers on the Internet, especially on Unix-based systems. Two vulnerabilities have been discovered that affects various versions of BIND 9. The first relates to SIG query processing and the second relates to a condition that can trigger an INSIST failure. ISC has produced patches to address these problems. Please see 'Solution' for details on patches required to address these flaws. Details 172003/NISCC/BIND9/1: Assertion failure in ISC BIND SIG query processing CVE ID: CVE-2006-4095 • Recursive servers Queries for SIG records will trigger an assertion failure if more than one RRset is returned. However exposure can be minimized by restricting which sources can ask for recursion. • Authoritative servers If a nameserver is serving a RFC 2535 DNSSEC zone and is queried for the SIG records where there are multiple RRsets, then the named program will trigger an assertion failure when it tries to construct the response. 172003/NISCC/BIND9/2: INSIST failure in ISC BIND recursive query handling code CVE ID: CVE-2006-4096 It is possible to trigger an INSIST failure by sending enough recursive queries such that the response to the query arrives after all the clients waiting for the response have left the recursion queue. However exposure can be minimized by restricting which sources can ask for recursion. Solution Please upgrade to BIND 9.3.2-P1, BIND 9.2.7 or BIND 9.2.6-P1. BIND 9.3.2-P1 and BIND 9.2.6-P1 can be found via http://www.isc.org/sw/bind/ Vendor Information Internet Systems Consortium, Inc. (ISC) is a non-profit public benefit corporation dedicated to supporting the infrastructure of the Internet. Please visit http://www.isc.org for further information regarding ISC. Acknowledgements The NISCC Vulnerability Management Team would like to thank ISC for reporting this issue to NISCC and for their assistance in the handling of this vulnerability. The NISCC Vulnerability Management Team would also like to thank the vendors for their co-operation in the handling of this vulnerability. References JPCERT/CC: http://jvn.jp/niscc/NISCC-172003/index.html CERT/CC: • VU#697164 - BIND INSIST failure due to excessive recursive queries • VU#915404 - BIND assertion failure during SIG query processing Contact Information The NISCC Vulnerability Management Team can be contacted as follows: Email vulteam@niscc.gov.uk (Please quote the advisory reference in the subject line.) Telephone +44 (0)870 487 0748 Extension 4511 (Monday to Friday 08:30 - 17:00) Fax +44 (0)870 487 0749 Post Vulnerability Management Team NISCC PO Box 832 London SW1P 1BG We encourage those who wish to communicate via email to make use of our PGP key. This is available from http://www.niscc.gov.uk/niscc/publicKey2-en.pop. Please note that UK government protectively marked material should not be sent to the email address above. If you wish to be added to our email distribution list, please email your request to uniras@niscc.gov.uk. What is NISCC? For further information regarding the UK National Infrastructure Security Co-Ordination Centre, please visit the NISCC web site at: http://www.niscc.gov.uk/ Reference to any specific commercial product, process or service by trade name, trademark manufacturer or otherwise, does not constitute or imply its endorsement, recommendation, or favouring by NISCC. The views and opinions of authors expressed within this notice shall not be used for advertising or product endorsement purposes. Neither shall NISCC accept responsibility for any errors or omissions contained within this advisory. In particular, they shall not be liable for any loss or damage whatsoever, arising from or in connection with the usage of information contained within this notice. © 2006 Crown Copyright Revision History 5 September 2006 Initial release (1.0) [***** End NISCC Vulnerability Advisory 172003/NISCC/BIND9 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of NISCC for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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