==================================================================== CERT-Renater Note d'Information No. 2020/VULN465 _____________________________________________________________________ DATE : 21/08/2020 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running BIND versions prior to 9.11.22, 9.16.6, 9.17.4. ===================================================================== https://lists.isc.org/pipermail/bind-announce/2020-August/001162.html https://lists.isc.org/pipermail/bind-announce/2020-August/001163.html https://lists.isc.org/pipermail/bind-announce/2020-August/001164.html https://lists.isc.org/pipermail/bind-announce/2020-August/001165.html https://lists.isc.org/pipermail/bind-announce/2020-August/001166.html https://lists.isc.org/pipermail/bind-announce/2020-August/001167.html _____________________________________________________________________ Our August maintenance releases of BIND are available and can be downloaded from the ISC software download page, https://www.isc.org/download In addition to bug fixes and feature improvements, these particular maintenance releases also contain fixes for five vulnerabilities, CVE-2020-8620, CVE-2020-8621, CVE-2020-8622, CVE-2020-8623, and CVE-2020-8624, about which more information is provided in these Security Advisories: https://kb.isc.org/docs/cve-2020-8620 https://kb.isc.org/docs/cve-2020-8621 https://kb.isc.org/docs/cve-2020-8622 https://kb.isc.org/docs/cve-2020-8623 https://kb.isc.org/docs/cve-2020-8624 A summary of significant changes in the new releases can be found in their release notes: current supported stable branches: 9.11.22 - https://downloads.isc.org/isc/bind9/9.11.22/RELEASE-NOTES-bind-9.11.22.html 9.16.6 - https://downloads.isc.org/isc/bind9/9.16.6/doc/arm/html/notes.html experimental development branch: 9.17.4 - https://downloads.isc.org/isc/bind9/9.17.4/doc/arm/html/notes.html _____________________________________________________________________ CVE: CVE-2020-8620 Document version: 2.0 Posting date: 20 August 2020 Program impacted: BIND Versions affected: BIND 9.15.6 -> 9.16.5, 9.17.0 -> 9.17.3 Severity: Medium Exploitable: Remotely Description: In versions of BIND that use the libuv network manager (9.16.x is the only stable branch affected) an incorrectly specified maximum buffer size allows a specially crafted large TCP payload to trigger an assertion failure when it is received. Impact: An attacker who can establish a TCP connection with the server and send data on that connection can exploit this to trigger the assertion failure, causing the server to exit. CVSS Score: 6.7 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND: - BIND 9.16.6 - BIND 9.17.4 Acknowledgments: ISC would like to thank Emanuel Almeida of Cisco Systems, Inc. for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 12 August 2020 1.1 Updated Posting Date, 17 August 2020 2.0 Public Announcement, 20 August 2020 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/pgpkey/ If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/reportbug/ 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/download/.) 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 at https://kb.isc.org/docs/aa-00861 The Knowledgebase article https://kb.isc.org/docs/cve-2020-8620 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. _____________________________________________________________________ CVE: CVE-2020-8621 Document version: 2.0 Posting date: 20 August 2020 Program impacted: BIND Versions affected: BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3 Severity: Medium Exploitable: Remotely Description: While query forwarding and QNAME minimization are mutually incompatible, BIND did sometimes allow QNAME minimization when continuing with recursion after 'forward first' did not result in an answer. In these cases the data used by QNAME minimization might be inconsistent, leading to an assertion failure, causing the server to exit. Impact: If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected. CVSS Score: 6.7 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND: - BIND 9.16.6 - BIND 9.17.4 Acknowledgments: ISC would like to thank Joseph Gullo for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 12 August 2020 1.1 Updated Posting Date, 17 August 2020 2.0 Public Announcement, 20 August 2020 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/pgpkey/ If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/reportbug/ 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/download/.) 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 at https://kb.isc.org/docs/aa-00861 The Knowledgebase article https://kb.isc.org/docs/cve-2020-8621 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. _____________________________________________________________________ CVE: CVE-2020-8622 Document version: 2.0 Posting date: 20 August 2020 Program impacted: BIND Versions affected: BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND Supported Preview Edition Severity: Medium Exploitable: Remotely Description: Attempting to verify a truncated response to a TSIG-signed request leads to an assertion failure. Impact: An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit. CVSS Score: 5.9 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C 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:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND: - BIND 9.11.22 - BIND 9.16.6 - BIND 9.17.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. - BIND 9.11.22-S1 Acknowledgments: ISC would like to thank Dave Feldman, Jeff Warren, and Joel Cunningham of Oracle for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 12 August 2020 1.1 Updated Posting Date, 17 August 2020 2.0 Public Announcement, 20 August 2020 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/pgpkey/ If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/reportbug/ 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/download/.) 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 at https://kb.isc.org/docs/aa-00861 The Knowledgebase article https://kb.isc.org/docs/cve-2020-8622 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. _____________________________________________________________________ CVE: CVE-2020-8623 Document version: 2.0 Posting date: 20 August 2020 Program impacted: BIND Versions affected: BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition Severity: Medium Exploitable: Remotely Description: If BIND is built with "--enable-native-pkcs11" then a specially crafted query for a zone signed with RSA can trigger an assertion failure. Impact: An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: - be running BIND that was built with "--enable-native-pkcs11" - be signing one or more zones with an RSA key - be able to receive queries from a possible attacker CVSS Score: 6.7 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits. Solution: Upgrade to the patched release most closely related to your current version of BIND: - BIND 9.11.22 - BIND 9.16.6 - BIND 9.17.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. - BIND 9.11.22-S1 Acknowledgments: ISC would like to thank Lyu Chiy for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 12 August 2020 1.1 Updated Posting Date, 17 August 2020 2.0 Public Announcement, 20 August 2020 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/pgpkey/ If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/reportbug/ 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/download/.) 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 at https://kb.isc.org/docs/aa-00861 The Knowledgebase article https://kb.isc.org/docs/cve-2020-8623 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. _____________________________________________________________________ CVE: CVE-2020-8624 Document version: 2.0 Posting date: 20 August 2020 Program impacted: BIND Versions affected: BIND 9.9.12 -> 9.9.13, 9.10.7 -> 9.10.8, 9.11.3 -> 9.11.21, 9.12.1 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.12-S1 -> 9.9.13-S1, 9.11.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition Severity: Low Exploitable: Remotely Description: Change 4885 inadvertently caused "update-policy" rules of type "subdomain" to be treated as if they were of type "zonesub", allowing updates to all parts of the zone along with the intended subdomain. Impact: An attacker who has been granted privileges to change a specific subset of the zone's content could abuse these unintended additional privileges to update other contents of the zone. CVSS Score: 3.9 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C 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:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C&version=3.1. Workarounds: No workarounds known. Active exploits: We are not aware of any active exploits but the issue has been described on a public bug tracker for a Linux distribution. Solution: Upgrade to the patched release most closely related to your current version of BIND: - BIND 9.11.22 - BIND 9.16.6 - BIND 9.17.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. - BIND 9.11.22-S1 Acknowledgments: ISC would like to thank Joop Boonen of credativ GmbH for bringing this vulnerability to our attention. Document revision history: 1.0 Early Notification, 12 August 2020 1.1 Updated Posting Date, 17 August 2020 2.0 Public Announcement, 20 August 2020 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/pgpkey/ If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/reportbug/ 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/download/.) 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 at https://kb.isc.org/docs/aa-00861 The Knowledgebase article https://kb.isc.org/docs/cve-2020-8624 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. ========================================================= + CERT-RENATER       |    tel : 01-53-94-20-44          + + 23/25 Rue Daviel   |    fax : 01-53-94-20-41          + + 75013 Paris        |    email:cert@support.renater.fr + =========================================================