Date: Tue, 28 Jul 2015 23:52:53 -0400 From: Michael McNally <mcnally@....org> To: oss-security@...ts.openwall.com Subject: [BIND] CVE-2015-5477: An error in handling TKEY queries can cause named to exit with a REQUIRE assertion failure A deliberately constructed packet can exploit an error in the handling of queries for TKEY records, permitting denial of service. CVE: CVE-2015-5477 Document Version: 1.0 Posting date: 28 July 2015 Program Impacted: BIND Versions affected: 9.1.0 -> 9.8.x, 9.9.0->9.9.7-P1, 9.10.0->9.10.2-P2 Severity: Critical Exploitable: Remotely Description: An error in the handling of TKEY queries can be exploited by an attacker for use as a denial-of-service vector, as a constructed packet can use the defect to trigger a REQUIRE assertion failure, causing BIND to exit. Impact: Both recursive and authoritative servers are vulnerable to this defect. Additionally, exposure is not prevented by either ACLs or configuration options limiting or denying service because the exploitable code occurs early in the packet handling, before checks enforcing those boundaries. All versions of BIND 9 from BIND 9.1.0 (inclusive) through BIND 9.9.7-P1 and BIND 9.10.2-P2 are vulnerable. Operators should take steps to upgrade to a patched version as soon as possible. CVSS Score: 7.8 CVSS Vector: (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: https://nvd.nist.gov/cvss.cfm?calculator&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C) Workarounds: None. Active exploits: None known. Solution: Upgrade to the patched release most closely related to your current version of BIND. These can be downloaded from http://www.isc.org/downloads. + BIND 9 version 9.9.7-P2 + BIND 9 version 9.10.2-P3 Acknowledgements: ISC would like to thank Jonathan Foote for discovering and disclosing this vulnerability. Document Revision History: 1.0 Advance Notification - 21 July, 2015 2.0 Public Disclosure - 28 July, 2015 Related Documents: See our BIND9 Security Vulnerability Matrix at https://kb.isc.org/article/AA-00913 for a complete listing of Security Vulnerabilities and versions affected. If you'd like more information on ISC Subscription Support and Advance Security Notifications, please visit http://www.isc.org/services Do you still have questions? Questions regarding this advisory should go to security-officer@....org. To report a new issue, please encrypt your message using security-officer@....org's PGP key which can be found here: https://www.isc.org/downloads/software-support-policy/openpgp-key/. If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/community/report-bug/. Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. (For current information on which versions are actively supported, please see http://www.isc.org/downloads/). ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found here: https://kb.isc.org/article/AA-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html This Knowledge Base article https://kb.isc.org/article/AA-01272 is the complete and official security advisory document. 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) 2001-2015 Internet Systems Consortium
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