From mcnally at isc.org Wed Jun 19 21:40:45 2019 From: mcnally at isc.org (Michael McNally) Date: Wed, 19 Jun 2019 13:40:45 -0800 Subject: CVE-2019-6471: A race condition when discarding malformed packets can cause BIND to exit with an assertion failure Message-ID: <7da3d6c3-b388-8942-45cd-fc80dcafee09@isc.org> CVE: CVE-2019-6471 Document version: 2.0 Posting date: 19 June 2019 Program impacted: BIND Versions affected: BIND 9.11.0 -> 9.11.7, 9.12.0 -> 9.12.4-P1, 9.14.0 -> 9.14.2. Also all releases of the BIND 9.13 development branch and version 9.15.0 of the BIND 9.15 development branch. BIND Supported Preview Edition versions 9.11.3-S1 -> 9.11.7-S1. Severity: Medium Exploitable: Remotely Description: A race condition which may occur when discarding malformed packets can result in BIND exiting due to a REQUIRE assertion failure in dispatch.c. Impact: An attacker who can cause a resolver to perform queries which will be answered by a server which responds with deliberately malformed answers can cause named to exit, denying service to clients. CVSS Score: 5.9 CVSS Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H. Workarounds: None. Active exploits: None known. Solution: Upgrade to the patched release most closely related to your current version of BIND: + BIND 9.11.8 + BIND 9.12.4-P2 + BIND 9.14.3 + BIND 9.15.1 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. + BIND 9.11.8-S1 Acknowledgements: ISC would like to thank CERN for helping us to discover this issue. Document revision history: 1.0 Early Notification, 12 June 2019 2.0 Public Disclosure, 19 June 2019 Related documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected. Do you still have questions? Questions regarding this advisory should go to security-officer at isc.org. To report a new issue, please encrypt your message using security-officer at 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 https://www.isc.org/downloads/.) ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy. 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. From mcnally at isc.org Wed Jun 19 21:40:51 2019 From: mcnally at isc.org (Michael McNally) Date: Wed, 19 Jun 2019 13:40:51 -0800 Subject: New versions of BIND are available Message-ID: New maintenance releases of BIND are available which contain bug fixes and feature improvements as well as fixes for CVE-2019-6471 (just announced today.) The new releases can be downloaded from our downloads page: https://www.isc.org/downloads Release notes can be found via these links: 9.11.8: https://ftp.isc.org/isc/bind9/9.11.8/RELEASE-NOTES-bind-9.11.8.html 9.14.3: https://ftp.isc.org/isc/bind9/9.14.3/RELEASE-NOTES-bind-9.14.3.html 9.15.1: https://ftp.isc.org/isc/bind9/9.15.1/RELEASE-NOTES-bind-9.15.1.html Additionally although official support for the 9.12 branch ended in May, a patch release version of 9.12 is also available from the ISC downloads page linked above. Release notes for the 9.12 release are here: 9.12.4-P2: https://ftp.isc.org/isc/bind9/9.12.4-P2/RELEASE-NOTES-bind-9.12.4-P2.html Users who want *only* the fix for CVE-2019-6471 can request a patch diff from us (via e-mail to security-officer at isc.org) specifying which branch they are using. Michael McNally ISC Support