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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0549 BIND Multiple vulnerabilities addressed. 22 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIND Publisher: ISC Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-6465 CVE-2018-5745 CVE-2018-5744 Original Bulletin: https://kb.isc.org/docs/CVE-2018-5744 https://kb.isc.org/docs/CVE-2018-5745 https://kb.isc.org/docs/CVE-2019-6465 Comment: This bulletin contains three (3) advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- CVE: CVE-2018-5744 Document version: 2.0 Posting date: 21 February 2019 Program impacted: BIND Versions affected: BIND 9.10.7 -> 9.10.8-P1, 9.11.3 -> 9.11.5-P1, 9.12.0 -> 9.12.3-P1, and versions 9.10.7-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.5-W1 of the 9.13 development branch are also affected. Severity: High Exploitable: Remotely Description: A failure to free memory can occur when processing messages having a specific combination of EDNS options. Impact: By exploiting this condition, an attacker can potentially cause named's memory use to grow without bounds until all memory available to the process is exhausted. Typically a server process is limited as to the amount of memory it can use but if the named process is not limited by the operating system all free memory on the server could be exhausted. CVSS Score: 7.5 CVSS Vector: CVSS:3.0/AV:N/AC:L/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:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Workarounds: None. Active exploits: None known. Solution: Upgrade to a version of BIND containing a fix for the memory leak. + BIND 9.11.5-P4 + BIND 9.12.3-P4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. + BIND 9.11.5-S5 Acknowledgements: ISC would like to thank Toshifumi Sakaguchi for reporting this issue to us. Document revision history: 1.0 Advance Notification, 16 January 2019 2.0 Public Disclosure, 21 February 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@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 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. - -------------------------------------------------------------------------------- CVE: CVE-2018-5745 Document version: 2.0 Posting date: 21 February 2019 Program impacted: BIND Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P1, 9.12.0 -> 9.12.3-P1, and versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5745. Severity: Medium Exploitable: Remotely. Description: "managed-keys" is a feature which allows a BIND resolver to automatically maintain the keys used by trust anchors which operators configure for use in DNSSEC validation. Due to an error in the managed-keys feature it is possible for a BIND server which uses managed-keys to exit due to an assertion failure if, during key rollover, a trust anchor's keys are replaced with keys which use an unsupported algorithm. Impact: This particular vulnerability would be very difficult for an arbitrary attacker to use because it requires an operator to have BIND configured to use a trust anchor managed by the attacker. However, if successfully exercised, the defect will cause named to deliberately exit after encountering an assertion failure. It is more likely, perhaps, that this bug could be encountered accidentally, as not all versions of BIND support the same set of cryptographic algorithms. Specifically, recent branches of BIND have begun deliberately removing support for cryptographic algorithms that are now deprecated (for example because they are no longer considered sufficiently secure.) This vulnerability could be encountered if a resolver running a version of BIND which has removed support for deprecated algorithms is configured to use a trust anchor which elects to change algorithm types to one of those deprecated algorithms. + Support for GOST was removed from BIND in 9.13.1. + Support for DSA was removed from BIND in 9.13.4 + Support for RSAMD5 will be removed from future BIND releases in the 9.13 branch and higher. CVSS Score: 4.9 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:H/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:L/PR:H/UI:N/S:U/C:N/I:N/A:H. Workarounds: None. Active exploits: None known. Solution: Upgrade to a version of BIND containing a fix preventing the assertion failure. + BIND 9.11.5-P4 + BIND 9.12.3-P4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. + BIND 9.11.5-S5 Document revision history: 1.0 Advance Notification, 23 January 2019 2.0 Public Disclosure, 21 February 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@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 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. - -------------------------------------------------------------------------------- CVE: CVE-2019-6465 Document version: 2.0 Posting date: 21 February 2019 Program impacted: BIND Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P2, 9.12.0 -> 9.12.3-P2, and versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2019-6465. Severity: Medium Exploitable: Remotely Description: Controls for zone transfers may not be properly applied to Dynamically Loadable Zones (DLZs) if the zones are writable. Impact: A client exercising this defect can request and receive a zone transfer of a DLZ even when not permitted to do so by the allow-transfer ACL. CVSS Score: 5.3 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N 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:L/PR:N/UI:N/S:U/C:L/I:N/A:N. Workarounds: None Active exploits: None known. Solution: Upgrade to the patched release most closely related to your current version of BIND: + BIND 9.11.5-P4 + BIND 9.12.3-P4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. + BIND 9.11.5-S5 Document revision history: 1.0 Early Notification, 28 January 2019 2.0 Public Disclosure, 21 February 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@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 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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