19 July 2016
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1773 A vulnerability has been identified in BIND 19 July 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIND Publisher: Internet Systems Consortium Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-2775 Original Bulletin: https://kb.isc.org/article/AA-01393 - --------------------------BEGIN INCLUDED TEXT-------------------- Although not commonly used, the BIND package contains provisions to allow systems to resolve names using the lightweight resolver protocol, a protocol similar to (but distinct from) the normal DNS protocols. The lightweight resolver protocol can be used either by running the lwresd utility installed with BIND or by configuring named using the "lwres" statement in named.conf. An error has been discovered in the BIND implementation of the lightweight resolver protocol affecting systems which use this alternate method to do name resolution. CVE: CVE-2016-2775 Document Version: 2.0 Posting date: 18 July 2016 Program Impacted: BIND (lwres only) Versions affected: 9.0.x -> 9.9.9-P1, 9.10.0->9.10.4-P1, 9.11.0a3->9.11.0b1 Severity: Medium Exploitable: Remotely (if lwres is configured to accept remote client connections) Description: If the lightweight resolver is asked to resolve a query name which, when combined with a search list entry, exceeds the maximum allowable length, the server can terminate due to an error. Impact: A server which is affected by this defect will terminate with a segmentation fault error, resulting in a denial of service to client programs attempting to resolve names. CVSS Score: 5.4 if the server is configured to accept requests from the network. CVSS Vector: (AV:N/AC:H/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:H/Au:N/C:N/I:N/A:C) Workarounds: None. Active exploits: No known active exploits, but the bug has been publicly disclosed in an open bug repository operated by Red Hat. Solution: Upgrade to the patched release most closely related to your current version of BIND. These can be downloaded from http://www.isc.org/downloads. - BIND 9 version 9.9.9-P2 - BIND 9 version 9.10.4-P2 The BIND 9.11 branch is currently in beta development. - BIND 9 version 9.11.0b2 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-S3 Document Revision History: 1.0 Advance Notification, 14 July 2016 2.0 Public Disclosure, 18 July 2016 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 email@example.com. To report a new issue, please encrypt your message using firstname.lastname@example.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 This Knowledge Base article https://kb.isc.org/article/AA-01393 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. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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