From cathya at isc.org Wed Oct 16 17:36:45 2019 From: cathya at isc.org (Cathy Almond) Date: Wed, 16 Oct 2019 18:36:45 +0100 Subject: CVE-2019-6475: A flaw in mirror zone validity checking can allow zone data to be spoofed Message-ID: <005feee8-7297-4fa7-7515-eda1d8889a46@isc.org> CVE: CVE-2019-6475 Document version: 2.0 Posting date: 16 October 2019 Program impacted: BIND Versions affected: BIND 9.14.0 -> 9.14.6. Also releases 9.15.0 -> 9.15.4 of the BIND 9.15 development branch. Severity: Medium Exploitable: Remotely Description: Mirror zones are a BIND feature allowing recursive servers to pre-cache zone data provided by other servers. A mirror zone is similar to a zone of type secondary, except that its data is subject to DNSSEC validation before being used in answers, as if it had been looked up via traditional recursion, and when mirror zone data cannot be validated, BIND falls back to using traditional recursion instead of the mirror zone. However, an error in the validity checks for the incoming zone data can allow an on-path attacker to replace zone data that was validated with a configured trust anchor with forged data of the attacker's choosing. The mirror zone feature is most often used to serve a local copy of the root zone. If an attacker was able to insert themselves into the network path between a recursive server using a mirror zone and a root name server, this vulnerability could then be used to cause the recursive server to accept a copy of falsified root zone data. Impact: An on-path attacker who manages to successfully exploit this vulnerability can replace the mirrored zone (usually the root) with data of their own choosing, effectively bypassing DNSSEC protection. CVSS Score: 5.9 CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N. Workarounds: The vulnerability can be avoided by not using mirror zones. Active exploits: None known. Solution: Upgrade to the patched release most closely related to your current version of BIND: + BIND 9.14.7 + BIND 9.15.5 Document revision history: 1.0 Early Notification, 09 October 2019 2.0 Public Disclosure, 16 October 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 cathya at isc.org Wed Oct 16 17:36:53 2019 From: cathya at isc.org (Cathy Almond) Date: Wed, 16 Oct 2019 18:36:53 +0100 Subject: CVE-2019-6476: An error in QNAME minimization code can cause BIND to exit with an assertion failure Message-ID: CVE: CVE-2019-6476 Document version: 2.0 Posting date: 16 October 2019 Program impacted: BIND Versions affected: BIND 9.14.0 -> 9.14.6. Also releases 9.15.0 -> 9.15.4 of the BIND 9.15 development branch. Severity: Medium Exploitable: Remotely Description: A defect in code added to support QNAME minimization can cause named to exit with an assertion failure if a forwarder returns a referral rather than resolving the query. Impact: An attacker who manages to deliberately trigger this condition on a server which is performing recursion can cause named to exit, denying service to clients. CVSS Score: 5.9 CVSS Vector: CVSS:3.1/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://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H. Workarounds: Servers which have QNAME minimization turned on are potentially vulnerable to this defect if they are running an affected version of BIND. The vulnerability can be avoided by disabling QNAME minimization using "qname-minimization disabled;" in the global options section of named.conf (Note: the default value for the qname-minimization setting in the 9.14 and 9.15 branches is "relaxed". To make use of this workaround it must be explicitly disabled.) Active exploits: None known. Solution: Upgrade to the patched release most closely related to your current version of BIND: + BIND 9.14.7 + BIND 9.15.5 Document revision history: 1.0 Early Notification, 09 October 2019 2.0 Public Disclosure, 16 October 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 cathya at isc.org Wed Oct 16 17:37:07 2019 From: cathya at isc.org (Cathy Almond) Date: Wed, 16 Oct 2019 18:37:07 +0100 Subject: New security release versions of BIND are available: 9.11.12, 9.14.7 and 9.15.5 Message-ID: <07decb0c-10c3-9764-fbc4-8cbdd7d6316c@isc.org> New security releases of BIND are available which contain fixes for the CVEs disclosed today. The new versions of BIND are available for download from the ISC website's downloads page -- https://www.isc.org/downloads Release notes can be found via these links. Stable release branches: 9.11.12: https://downloads.isc.org/isc/bind9/9.11.12/RELEASE-NOTES-bind-9.11.12.html 9.14.7: https://downloads.isc.org/isc/bind9/9.14.7/RELEASE-NOTES-bind-9.14.7.html Experimental development branch 9.15.5: https://downloads.isc.org/isc/bind9/9.15.5/RELEASE-NOTES-bind-9.15.5.html Cathy Almond ISC Support From cathya at isc.org Wed Oct 16 19:01:44 2019 From: cathya at isc.org (Cathy Almond) Date: Wed, 16 Oct 2019 20:01:44 +0100 Subject: New security release versions of BIND are available: 9.11.12, 9.14.7 and 9.15.5 In-Reply-To: <07decb0c-10c3-9764-fbc4-8cbdd7d6316c@isc.org> References: <07decb0c-10c3-9764-fbc4-8cbdd7d6316c@isc.org> Message-ID: On 16/10/2019 18:37, Cathy Almond wrote: > New security releases of BIND are available which contain fixes for > the CVEs disclosed today. > > The new versions of BIND are available for download from the ISC website's > downloads page -- https://www.isc.org/downloads > > Release notes can be found via these links. > > Stable release branches: > 9.11.12: > https://downloads.isc.org/isc/bind9/9.11.12/RELEASE-NOTES-bind-9.11.12.html > 9.14.7: > https://downloads.isc.org/isc/bind9/9.14.7/RELEASE-NOTES-bind-9.14.7.html > > Experimental development branch > 9.15.5: > https://downloads.isc.org/isc/bind9/9.15.5/RELEASE-NOTES-bind-9.15.5.html > > Cathy Almond > ISC Support > To clarify, BIND 9.11.12 is not a security release, but BIND 9.14.7 and 9.15.5 are. The two CVEs disclosed today affect only BIND 9.14 and 9.15; the BIND 9.11 branch is not vulnerable. Apologies for the ambiguous communication and any confusion that may have been caused as a result. Cathy Almond ISC Support From sgoldlust at isc.org Wed Oct 23 16:01:42 2019 From: sgoldlust at isc.org (Suzanne Goldlust) Date: Wed, 23 Oct 2019 12:01:42 -0400 Subject: BIND logging webinar next Wednesday, 1 PM ET Message-ID: <1D4821C9-FA93-4838-B262-CC77261ADDD6@isc.org> ISC?s Alan Clegg will be leading our next webinar at 1 PM ET on Wednesday, Oct. 30, on the topic of BIND logging. He'll show you how to optimize the logging in BIND so you can get the information you need without creating huge log files. We hope many BIND 9 users will find this information useful and invite everyone to attend. If you can?t participate live, please visit https://www.isc.org/presentations/ afterwards to watch a recording and/or download the slides. Please click the link below to register. Thank you for using BIND! https://zoom.us/webinar/register/WN_kOTLEEd-R_Gh4ydZ8mki0Q ZOOM.US -------------- next part -------------- An HTML attachment was scrubbed... URL: