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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2005.0077 -- UNIRAS ALERTS 03/05 and 04/05 Denial of Service Vulnerabilities in BIND 8 and BIND 9 27 January 2005 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIND 8.4.4, 8.4.5 and 9.3.0 Publisher: UNIRAS Operating System: UNIX variants Linux variants Impact: Denial of Service Access: Remote/Unauthenticated CVE Names: CAN-2005-0033 CAN-2005-0034 Original Bulletin: http://www.niscc.gov.uk/niscc/vulnAdv-en.html Comment: This bulletin contains two separate advisories, for BIND 8 and BIND 9 respectively. - --------------------------BEGIN INCLUDED TEXT-------------------- - ---------------------------------------------------------------------------------- UNIRAS (UK Govt CERT) ALERT - 03/05 dated 25.01.05 Time: 14:10 UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre) - ---------------------------------------------------------------------------------- UNIRAS material is also available from its website at www.uniras.gov.uk and Information about NISCC is available from www.niscc.gov.uk - ---------------------------------------------------------------------------------- Title ===== Vulnerability Issues with the BIND 8 Software Detail ====== NISCC Vulnerability Advisory 454305/NISCC/BIND8 Vulnerability Issues with the BIND 8 Software Version Information - ------------------- Advisory Reference 454305/NISCC/BIND8 Release Date 25 Jan 2005 Last Revision 21 Jan 2005 Version Number 1.0 What is affected? - ----------------- The vulnerability only affects BIND v8.4.4 and v8.4.5. Severity - -------- This is rated as low, although if exploited this could potentially result in a denial-of-service. Summary - ------- A remote buffer overrun vulnerability concerning BIND 8 have been discovered by the Internet Systems Consortium, Inc. (ISC). ISC have solutions available that can rectify these issues, please refer to the 'Solution' section for further information. [Please note that revisions to this advisory will not be notified by email. All subscribers are advised to regularly check the NISCC website (http://www.niscc.gov.uk/niscc/vulnAdv-en.html) for updates to this notice.] Details - ------- CVE ID: CAN-2005-0033 BIND uses a certain array to track nameservers/addresses that have been queried; it is possible to remotely overrun the buffer for this array and hence cause a denial-of-service. Mitigation - ---------- ISC have recommended the following work-around: - - Disable recursion and glue fetching Solution - -------- ISC have released an updated version of BIND to rectify this issue: - - BIND 8.4.6 This is available from the ISC website at http://www.isc.org/sw/bind/. ISC have also produced a patch for users who cannot upgrade to BIND 8.4.6; please contact the NISCC Vulnerability Team at vulteam@niscc.gov.uk if you wish to receive the patch. 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. Credits - ------- The NISCC Vulnerability Team would like to thank ISC for reporting this issue to NISCC and for their assistance in the handling of this vulnerability. - ---------------------------------------------------------------------------------- UNIRAS (UK Govt CERT) ALERT - 04/05 dated 25.01.05 Time: 14:10 UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre) - ---------------------------------------------------------------------------------- UNIRAS material is also available from its website at www.uniras.gov.uk and Information about NISCC is available from www.niscc.gov.uk - ---------------------------------------------------------------------------------- Title ===== Vulnerability Issues with the BIND 9 Software Detail ====== NISCC Vulnerability Advisory 731920/NISCC/BIND9 Vulnerability Issues with the BIND 9 Software Version Information - ------------------- Advisory Reference 731920/NISCC/BIND9 Release Date 25 Jan 2005 Last Revision 21 Jan 2005 Version Number 1.0 What is affected? - ----------------- The vulnerability only affects BIND v9.3.0. Severity - -------- This is rated as low, although if exploited this could potentially result in a denial-of-service. Summary - ------- A weakness in the self-check function of BIND 9 have been discovered by the Internet Systems Consortium, Inc. (ISC). ISC have solutions available that can rectify these issues, please refer to the 'Solution' section for further information. [Please note that revisions to this advisory will not be notified by email. All subscribers are advised to regularly check the NISCC website (http://www.niscc.gov.uk/niscc/vulnAdv-en.html) for updates to this notice.] Details - ------- CVE ID: CAN-2005-0034 An incorrect assumption in the validator can result in an internal consistency test failing and this can cause named to terminate abnormally. Mitigation - ---------- ISC have recommended the following work-around: - - Disable dnssec validation (off by default) at the Options/View level Solution - -------- ISC have released an updated version of BIND to recitify this issue: - - BIND 9.3.1 This is available from the ISC website at http://www.isc.org/sw/bind/. ISC have also produced a patch for users who cannot upgrade to BIND 9.3.1; please contact the NISCC Vulnerability Team at vulteam@niscc.gov.uk if you wish to receive the patch. 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. Credits - ------- The NISCC Vulnerability Team would like to thank ISC for reporting this issue to NISCC and for their assistance in the handling of this vulnerability. What is NISCC? - -------------- For further information regarding the UK National Infrastructure Security Co-ordination Centre, please visit 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. C 2005 Crown Copyright - ---------------------------------------------------------------------------------- UNIRAS wishes to acknowledge the contributions of ISC for the information contained in this Briefing. - ---------------------------------------------------------------------------------- This Briefing contains the information released by the original author. Some of the information may have changed since it was released. If the vulnerability affects you, it may be prudent to retrieve the advisory from the canonical site to ensure that you receive the most current information concerning that problem. 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 UNIRAS or NISCC. The views and opinions of authors expressed within this notice shall not be used for advertising or product endorsement purposes. Neither UNIRAS or NISCC shall also accept responsibility for any errors or omissions contained within this briefing notice. 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. UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) and has contacts with other international Incident Response Teams (IRTs) in order to foster cooperation and coordination in incident prevention, to prompt rapid reaction to incidents, and to promote information sharing amongst its members and the community at large. - ---------------------------------------------------------------------------------- - --------------------------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. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. 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 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== 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 iQCVAwUBQfgv1yh9+71yA2DNAQIfgQP+LV3Ol2Wn8sniVZkuPiF+YnKzQHF8QRwk 2PwrDX1y9FCToB2RzvMhXPA1RwDFKmUvwHSKfyCI0ziOFAZ42w9H0aQbW/XzfOtL Tzs6u3V4KrxmBud/iLYHASyZaVRm6p/tXHumTRvbvv7FrGM8JorpVGz2cqIgxH1L I9PCDLqXjK8= =nXXW -----END PGP SIGNATURE-----