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ESB-2016.0135 - [Win][UNIX/Linux] BIND: Denial of service - Remote/unauthenticated

Date: 20 January 2016
References: ESB-2016.0156  ESB-2016.0193  ESB-2016.0680  

Click here for printable version
Click here for PGP verifiable version
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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0135
           Multiple vulnerabilities have been identified in BIND
                              20 January 2016

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

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

Product:           BIND
Publisher:         ISC
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-8705 CVE-2015-8704 

Original Bulletin: 
   https://kb.isc.org/article/AA-01335
   https://kb.isc.org/article/AA-01336

Comment: This bulletin contains two (2) ISC security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

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.

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.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-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.

(c) 2001-2016 Internet Systems Consortium

- ---------------------------------------------------------------------------

CVE:                   CVE-2015-8705
Document Version:      2.0
Posting date:          19 January 2016
Program Impacted:      BIND
Versions affected:     9.10.0->9.10.3-P2
Severity:              Medium
Exploitable:           Remotely

Description:

   In versions of BIND 9.10, errors can occur when OPT pseudo-RR
   data or ECS options are formatted to text.  In 9.10.3 through
   9.10.3-P2, the issue may result in a REQUIRE assertion failure
   in buffer.c. In prior 9.10 versions, it may result in named
   crashing (such as with a segmentation fault) or other misbehavior
   due to a buffer overrun.

Impact:

   This issue can affect both authoritative and recursive servers
   if they are performing debug logging. (It may also crash related
   tools which use the same code, such as dig or delv.)

CVSS Score:            5.4
CVSS Vector:           (AV:N/AC:H/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:H/Au:N/C:N/I:N/A:C)

Workarounds:

   CVE-2015-8705 can be avoided in named by disabling debug logging.

Active exploits:

   No known active exploits.

Solution:

   Upgrade to the patched release most closely related to your
   current version of BIND.  This can be downloaded from
   http://www.isc.org/downloads.

   -  BIND 9 version 9.10.3-P3

Acknowledgements:

   ISC would like to thank Tatuya Jinmei of Infoblox for discovering
   and reporting one of the issues corrected in this fix.

Document Revision History:

   1.0 Advance Notification 12 January 2016
   1.1 "Versions affected", "Severity", "Description",
        and "Impact" information corrected. 15 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.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-01336
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

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
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Qld 4072

Internet Email: auscert@auscert.org.au
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===========================================================================
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