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             AUSCERT External Security Bulletin Redistribution

   CVE-2012-5166: Specially crafted DNS data can cause a lockup in named
                              10 October 2012


        AusCERT Security Bulletin Summary

Product:           BIND
Publisher:         Internet Systems Consortium
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-5166  

Original Bulletin: 

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CVE-2012-5166: Specially crafted DNS data can cause a lockup in named

A nameserver can be locked up if it can be induced to load a specially
crafted combination of resource records.

CVE: CVE-2012-5166
Document Version:  2.0
Posting date:      9 October 2012
Program Impacted: BIND
Versions affected:
   9.2.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1, 9.6-ESV->9.6-ESV-R7-P3,
   9.7.0->9.7.6-P3, 9.8.0->9.8.3-P3, 9.9.0->9.9.1-P3
Severity: Critical


   If specific combinations of RDATA are loaded into a nameserver,
   either via cache or an authoritative zone, a subsequent query
   for a related record will cause named to lock up.

   Please Note: All versions of BIND 9.2, 9.3, 9.4 and 9.5 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/software/bind/versions.


   A nameserver that has become locked-up due to the problem reported
   in this advisory will not respond to queries or control commands.
   Normal functionality cannot be restored except by terminating
   and restarting named.

   This vulnerability can be exploited remotely against recursive
   servers by inducing them to query for records provided by an
   authoritative server. It affects authoritative servers if one
   of the combinations of resource records is loaded from file,
   provided via zone transfer, or submitted to a zone via dynamic

CVSS Score:  7.8

CVSS Equation:  (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:


   Setting the option 'minimal-responses' to 'yes' will prevent the lockup.

Active exploits: 

   No known active exploits.


   Upgrade to the patched version or new release most closely related
   to your current version of BIND. The patched versions of BIND
   and new releases can be downloaded from

   BIND 9 version 9.7.7, 9.7.6-P4
   BIND 9 version 9.6-ESV-R8, 9.6-ESV-R7-P4
   BIND 9 version 9.8.4, 9.8.3-P4
   BIND 9 version 9.9.2, 9.9.1-P4


   ISC would like to thank Jake Montgomery of Dyn, Inc.

Document Revision History:

   1.0 - 1 Oct., 2012  Advance Notification to Phase 1
   1.1 - 8 Oct., 2012  Notification to Phase 3
   2.0 - 9 Oct., 2012  Notification to Phase 4 (Public)

Related Documents:

   See our BIND Security Matrix for a complete listing of Security
   Vulnerabilities and versions affected.  If you'd like more
   information on our Forum or product support please visit
   www.isc.org/software/guild or www.isc.org/support.

   Do you still have questions?  Questions regarding this advisory
   should go to security-officer@isc.org

   Note: ISC patches only currently supported versions. When possible
   we indicate EOL versions affected.

   ISC Security Vulnerability Disclosure Policy:  Details of our
   current security advisory policy and practice can be found here:

   The Knowledge Base article https://kb.isc.org/article/AA-00801
   is the complete and official security advisory document.  There
   is also a summary article located on our website and linking to
   here: https://www.isc.org/software/bind/advisories/cve-2012-5166

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.

(c) 2001-2012 Internet Systems Consortium

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