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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.0974 CVE-2012-5166: Specially crafted DNS data can cause a lockup in named 10 October 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIND Publisher: Internet Systems Consortium Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2012-5166 Original Bulletin: https://kb.isc.org/article/AA-00801 - --------------------------BEGIN INCLUDED TEXT-------------------- CVE-2012-5166: Specially crafted DNS data can cause a lockup in named A nameserver can be locked up if it can be induced to load a specially crafted combination of resource records. CVE: CVE-2012-5166 Document Version: 2.0 Posting date: 9 October 2012 Program Impacted: BIND Versions affected: 9.2.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1, 9.6-ESV->9.6-ESV-R7-P3, 9.7.0->9.7.6-P3, 9.8.0->9.8.3-P3, 9.9.0->9.9.1-P3 Severity: Critical Exploitable: Remotely Description: If specific combinations of RDATA are loaded into a nameserver, either via cache or an authoritative zone, a subsequent query for a related record will cause named to lock up. Please Note: All versions of BIND 9.2, 9.3, 9.4 and 9.5 are also affected, but these branches are beyond their "end of life" (EOL) and no longer receive testing or security fixes from ISC. For current information on which versions are actively supported, please see http://www.isc.org/software/bind/versions. Impact: A nameserver that has become locked-up due to the problem reported in this advisory will not respond to queries or control commands. Normal functionality cannot be restored except by terminating and restarting named. This vulnerability can be exploited remotely against recursive servers by inducing them to query for records provided by an authoritative server. It affects authoritative servers if one of the combinations of resource records is loaded from file, provided via zone transfer, or submitted to a zone via dynamic update. CVSS Score: 7.8 CVSS Equation: (AV:N/AC:L/Au:N/C:N/I:N/A:C) For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C) Workarounds: Setting the option 'minimal-responses' to 'yes' will prevent the lockup. Active exploits: No known active exploits. Solution: Upgrade to the patched version or new release most closely related to your current version of BIND. The patched versions of BIND and new releases can be downloaded from http://www.isc.org/downloads/all. BIND 9 version 9.7.7, 9.7.6-P4 BIND 9 version 9.6-ESV-R8, 9.6-ESV-R7-P4 BIND 9 version 9.8.4, 9.8.3-P4 BIND 9 version 9.9.2, 9.9.1-P4 Acknowledgement: ISC would like to thank Jake Montgomery of Dyn, Inc. Document Revision History: 1.0 - 1 Oct., 2012 Advance Notification to Phase 1 1.1 - 8 Oct., 2012 Notification to Phase 3 2.0 - 9 Oct., 2012 Notification to Phase 4 (Public) Related Documents: See our BIND Security Matrix for a complete listing of Security Vulnerabilities and versions affected. If you'd like more information on our Forum or product support please visit www.isc.org/software/guild or www.isc.org/support. Do you still have questions? Questions regarding this advisory should go to security-officer@isc.org Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found here: https://www.isc.org/security-vulnerability-disclosure-policy The Knowledge Base article https://kb.isc.org/article/AA-00801 is the complete and official security advisory document. There is also a summary article located on our website and linking to here: https://www.isc.org/software/bind/advisories/cve-2012-5166 Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors. (c) 2001-2012 Internet Systems Consortium _______________________________________________ - --------------------------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 iQIVAwUBUHUCeu4yVqjM2NGpAQLdIBAAjplkPc7TDBjpFsgq8JseGgYDDtPaI89/ h0XdGSkqZ1E22wzUpEB155VrrOw3B7Iz7ZyLZMAcKMYQGqt4f6iFRGpjBfoQwjax QreZiUeFrLJgqNXpVy8DZ/tP+2Do45N7jcjEVkMAdIrk10w5+QoKdoXOu9IQjsy8 4BxxwKs6rwJF8zFJU3dbV3TfU3cOGXVKpKhFVZ3cEknaREz5jrQxHlkew2MWWpWq M8+pRqEVaTrP6wSjPqOLIetXjmBYdnIpEGeYpPuFUj7+I1cbQko9OOVM/qNhxoQX cSisLM7dshwpu4nZVfzarUxIQLdRhKvAfGRZQm+Pr7Brdb/3HVudvHOJPYuLXbbV sRKoYHUTwPC59nWrlQGjJJJGYwWtoYQjWu6N6wPrEYksLs5aJQFgw0zxiwtYVOCs w2LsuhnZ6PYUMklEciCcaz3s7BroMVDIPYQRsDFNufqXvq6KWxiiiUdrG/x6/kop xtyGM2bQldu1ox6T2sqG0ssMgKfvC1cKczx3Uv71S3g+O05jTr3oyv4Sx6hkiMqp 0utLRISXczZRszIFjlySOCTjdSFonVM9Y9kB3htENCkwf8jKRbWTz1tvEuOLU0fz n1rPKRLKQ8/oQeXcKRq6nHP7UWT2ZwJD142PMlO86bg+8P+biyKLpDK4U8g99Nc3 teevOR2lPf8= =dhup -----END PGP SIGNATURE-----