==================================================================== CERT-Renater Note d'Information No. 2016/VULN339 _____________________________________________________________________ DATE : 30/09/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Bind versions 9 prior to 9.9.9-P3, 9.10.4-P3, 9.11.0rc3, 9.9.9-S5. ===================================================================== https://kb.isc.org/article/AA-01419/0 ____________________________________________________________________ CVE-2016-2776: Assertion Failure in buffer.c While Building Responses to a Specifically Constructed Request Author: Brian Conry Reference Number: AA-01419 Views: 18654 Created: 2016-09-27 08:30 Last Updated: 2016-09-27 16:08 CVE: CVE-2016-2776 Document Version: 2.0 Posting date: 2016-09-27 Program Impacted: BIND Versions affected: 9.0.x -> 9.8.x, 9.9.0->9.9.9-P2, 9.9.3-S1->9.9.9-S3, 9.10.0->9.10.4-P2, 9.11.0a1->9.11.0rc1 Severity: High Exploitable: Remotely Description: Testing by ISC has uncovered a critical error condition which can occur when a nameserver is constructing a response. A defect in the rendering of messages into packets can cause named to exit with an assertion failure in buffer.c while constructing a response to a query that meets certain criteria. This assertion can be triggered even if the apparent source address isn't allowed to make queries (i.e. doesn't match 'allow-query'). Impact: All servers are vulnerable if they can receive request packets from any source. 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: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C) Workarounds: No practical workarounds exist. Active exploits: No known active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND. These can all be downloaded from http://www.isc.org/downloads. BIND 9 version 9.9.9-P3 BIND 9 version 9.10.4-P3 BIND 9 version 9.11.0rc3 BIND 9 Supported Preview edition is a feature preview version of BIND provided exclusively to eligible ISC Support customers. BIND 9 version 9.9.9-S5 Document Revision History: 1.0 Advance Notification 2016-09-14 1.1 Added information about the Stable Preview release to versions affected. Updated solution section to reflect replacing 9.11.0rc2 with 9.11.0rc3 and 9.9.9-S4 with 9.9.9-S5. 2.0 Posting date changed and public disclosure. 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/support/. Do you still have questions? Questions regarding this advisory should go to security-officer@isc.org. To report a new issue, please encrypt your message using security-officer@isc.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-01419 is the complete and official security advisory document. Legal Disclaimer: Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. 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