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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2457
  CVE-2016-2848: A packet with malformed options can trigger an assertion
  failure in ISC BIND versions released prior to May 2013 and in packages
                 derived from releases prior to that date.
                              21 October 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           BIND
Publisher:         Internet Systems Consortium
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-2848  

Original Bulletin: 
   https://kb.isc.org/article/AA-01433

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CVE-2016-2848: A packet with malformed options can trigger an
assertion failure in ISC BIND versions released prior to May 2013
and in packages derived from releases prior to that date.


NOTE:    Please read the "Versions affected" and "Solutions" sections
         of this advisory carefully

         This article discusses a vulnerability in BIND that was corrected
         in ISC-distributed versions in May 2013.  However, some versions
         of BIND distributed by other parties continued to be vulnerable
         after that date.

Document Version:       2.0
Posting date:           20 October 2016
Program Impacted:       BIND
Versions affected:      9.1.0 -> 9.8.5rc1, 9.9.0 -> 9.9.3rc1
Severity:               High
Exploitable:            Remotely

Description:

   A packet with a malformed options section can be used to
   deliberately trigger an assertion failure affecting versions of
   BIND which do not contain change #3548, which was first included
   in ISC BIND 9 releases in May 2013.  Current ISC versions of
   BIND are safe from this vulnerability, but repackaged versions
   distributed by other parties may be vulnerable if they were
   forked from ISC's source before change #3548.

Impact:

   A server vulnerable to this defect can be forced to exit with
   an assertion failure if it receives a malformed packet.
   Authoritative and recursive servers are both vulnerable.

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

Workarounds:            None.
Active exploits:        No known active exploits.

Solution:

   The vulnerability described in this security advisory was corrected
   by bug fixes which occurred during the normal course of BIND
   development and release versions of BIND published by ISC have
   been safe against this vulnerability since May 2013.

   However, versions which were released prior to that date, including
   some versions which have been used as the basis for installable
   packages by operating system vendors who maintain their own BIND
   versions, may be vulnerable.

   The CHANGES file distributed with every version of BIND source
   contains a chronological list of source code changes in each
   branch's history.  Safe versions of BIND contain fix #3548.  If
   you did not receive source code with your distribution of BIND
   and cannot check CHANGES, check with the package provider who
   has furnished the BIND distribution you are using.  Current
   versions of BIND available from ISC are confirmed to be free of
   the vulnerability. These can all be downloaded from
   http://www.isc.org/downloads.

    -  BIND 9 version 9.9.9-P3
    -  BIND 9 version 9.10.4-P3
    -  BIND 9 version 9.11.0-P3

   BIND 9 Supported Preview edition is a feature preview version
   of BIND provided exclusively to eligible ISC Support customers.
   No release versions of BIND 9 Supported Preview Edition are
   vulnerable to this defect.

Acknowledgements:

   ISC would like to thank Toshifumi Sakaguchi for discovering this
   vulnerability.

Document Revision History:

   1.0 Advance Notification, 13 October 2016
   1.1 Public disclosure date changed, 14 October 2016
   2.0 Public disclosure, 20 October 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 Disclosure Policy:

   Details 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-01433 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.

(c) 2001-2016 Internet Systems Consortium

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