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List:       bind-announce
Subject:    CVE-2016-8864: A problem handling responses containing a DNAME, answer can lead to an assertion fail
From:       Brian Conry <bconry () isc ! org>
Date:       2016-11-01 19:59:15
Message-ID: 9a0defaf-7482-2bac-9167-df353ed80fb1 () isc ! org
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CVE-2016-8864: A problem handling responses containing a DNAME
answer can lead to an assertion failure

CVE:                    CVE-2016-8864
Document Version:       2.0
Posting date:           1 November 2016
Program Impacted:       BIND
Versions affected:      9.0.x -> 9.8.x, 9.9.0 -> 9.9.9-P3,
                        9.9.3-S1 -> 9.9.9-S5, 9.10.0 -> 9.10.4-P3,
                        9.11.0
Severity:               High
Exploitable:            Remotely

Description:

   A defect in BIND's handling of responses containing a DNAME answer
   can cause a resolver to exit after encountering an assertion failure
   in db.c or resolver.c

Impact:

   During processing of a recursive response that contains a DNAME
   record in the answer section, BIND can stop execution after
   encountering an assertion error in resolver.c (error message:
   "INSIST((valoptions & 0x0002U) != 0) failed") or db.c (error
   message: "REQUIRE(targetp != ((void *)0) && *targetp == ((void
   *)0)) failed").

 ther of these error conditions will stop,
   resulting in denial of service to clients.  The risk to authoritative
   servers is minimal; recursive servers are chiefly at risk.

CVSSv3 Score:           7.5
CVSSv3 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 known.

Active exploits:

   No known active exploits but a query which could trigger the crash
   was briefly discussed on a public mailing list before the domain
   owner pulled the record causing the problem.

Solution:

   Upgrade to the patched release most closely related to your current
   version of BIND.

   -  BIND 9 version 9.9.9-P4
   -  BIND 9 version 9.10.4-P4
   -  BIND 9 version 9.11.0-P1

   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-S6

Acknowledgements:

   ISC would like to thank Tony Finch (University of Cambridge), Marco
   Davids (SIDN Labs) and others for reporting and extending our
   understanding of the issue.

Document Revision History:

   1.0 Advance Notification 21 October, 2016
   1.1 Updated versions affected; Updated Acknowledgements.  27 October,
2016
   2.0 Public Announcement, 1 November, 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 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
   http://www.isc.org/downloads/).

ISC Security Vulnerability Disclos 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-01434 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 coplack important information, be out of
   date, or contain factual errors.

(c) 2001-2016 Internet Systems Consortium


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