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CVE-2015-8704: Specific APL data could trigger an INSIST in apl_42.c
Author: ISC Support Reference Number: AA-01335 Views: 60260 Created: 2016-01-19 11:54 Last Updated: 2016-04-18 23:32 0 Rating/ Voters
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.

Impact:

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 http://www.isc.org/downloads/.

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: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:L/Au:S/C:N/I:N/A:C)

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 http://www.isc.org/downloads.

  • 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 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.orgTo 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 Disclosure Policy:  Details of our current security advisory policy and practice can be found here: https://kb.isc.org/article/AA-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html

This Knowledge Base article https://kb.isc.org/article/AA-01335 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.


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