CVE-2016-1286: A problem parsing resource record signatures for DNAME resource records can lead to an assertion failure in resolver.c or db.c
  • 31 Oct 2018
  • 2 Minutes to read
  • Contributors
  • Dark
  • PDF

CVE-2016-1286: A problem parsing resource record signatures for DNAME resource records can lead to an assertion failure in resolver.c or db.c

  • Dark
  • PDF

Article summary

CVE: CVE-2016-1286

Document version: 2.0

Posting date: 09 March 2016

Program impacted: BIND

Versions affected: 9.0.0 -> 9.8.8, 9.9.0 -> 9.9.8-P3, 9.9.3-S1 -> 9.9.8-S5, 9.10.0 -> 9.10.3-P3

Severity: High

Exploitable: Remotely

Description: An error when parsing signature records for DNAME records having specific properties can lead to named exiting due to an assertion failure in resolver.c or db.c.


An attacker able to cause a server to make a query, deliberately chosen to generate a response containing a signature record which would exercise this vulnerability, can cause named to stop execution with an assertion failure, resulting in denial of service to clients. Recursive resolvers are at the highest risk of vulnerability to this attack, but authoritative-only servers may be also be vulnerable if the attacker can control the answers for records requested when the authoritative server is performing service on zones (e.g. a slave server doing SOA queries). Servers may be affected even if they are not performing validation or have DNSSEC disabled entirely, as long as they receive a response containing offending signature records. Disabling DNSSEC does not provide protection against this vulnerability.

CVSS Score: 7.8

CVSS Vector: (AV:N/AC:L/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:

Workarounds: None known.

Active exploits: No known active exploits.

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

  • BIND 9 version 9.9.8-P4
  • BIND 9 version 9.10.3-P4

BIND 9 Supported Preview edition is a feature preview version of BIND provided exclusively to eligible ISC Support customers.

  • BIND 9 version 9.9.8-S6

Document Revision History:

1.0 Advance Notification. 02 March 2016 1.1 "Versions affected" and "Solution" text expanded to cover BIND 9 Supported Preview Edition; "Versions affected" and "Impact" text expanded to cover all old versions. 07 March 2016 2.0 Public Disclosure. 09 March 2016

Related Documents: See our BIND 9 Security Vulnerability Matrix 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

Do you still have questions? Questions regarding this advisory should go to To report a new issue, please encrypt your message using's PGP key which can be found here: If you are unable to use encrypted email, you may also report new issues at:

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 

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.

This Knowledgebase article 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.