CVE-2015-8704: Specific APL data could trigger an INSIST in apl_42.c
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CVE-2015-8704: Specific APL data could trigger an INSIST in apl_42.c

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CVE: CVE-2015-8704

Document version: 2.0

Posting date: 19 January 2016

Program impacted: BIND

Versions affected: 9.3.0->9.8.8, 9.9.0->9.9.8-P2, 9.9.3-S1->9.9.8-S3, 9.10.0->9.10.3-P2

Severity: High

Exploitable: Remotely

Description: A buffer size check used to guard against overflow could cause named to exit with an INSIST failure in apl_42.c.


A server could exit due to an INSIST failure in apl_42.c when performing certain string formatting operations. Examples include (but may not be limited to):

  • Slaves using text-format db files could be vulnerable if receiving a malformed record in a zone transfer from their master.
  • Masters using text-format db files could be vulnerable if they accept a malformed record in a DDNS update message.
  • Recursive resolvers are potentially vulnerable when debug logging, if they are fed a deliberately malformed record by a malicious server.
  • A server which has cached a specially constructed record could encounter this condition while performing 'rndc dumpdb'.

Please note: Versions of BIND from 9.3 through 9.8 are also affected, but these branches are beyond their End of Life (EOL) and no longer receive testing or security fixes from ISC. For current information on which versions are actively supported, please see

CVSS Score: 6.8

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

Active exploits: No known active exploits.

Solution: Upgrade to the patched release most closely related to your current version of BIND.  These can all be downloaded from

  • BIND 9 version 9.9.8-P3
  • BIND 9 version 9.10.3-P3

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-S4

Document Revision History:

1.0 Advance Notification. 12 January 2016 2.0 Public Disclosure. 19 January 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:

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