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ESB-2014.0960 - [Win][UNIX/Linux] BIND: Denial of service - Remote/unauthenticated

Date: 12 June 2014

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.0960
        CVE-2014-3859: BIND named can crash due to a defect in EDNS
                            printing processing
                               12 June 2014

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

        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-2014-3859  

Original Bulletin: 
   https://kb.isc.org/article/AA-01166/74/CVE-2014-3859

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

CVE-2014-3859: BIND named can crash due to a defect in EDNS printing processing

Author: Jeremy Reed 
Reference Number: AA-01166 
Views: 129 
Created: 2014-05-28 13:28 
Last Updated: 2014-06-11 20:45 	
0 Rating/ Voters 	

A specially crafted query sent to a BIND nameserver can cause it to crash with 
a REQUIRE assertion error.

CVE: 			CVE-2014-3859  
Document Version:       2.0
Posting date: 		11 June 2014
Program Impacted: 	BIND
Versions affected: 	9.10.0, 9.10.0-P1
Severity: 		Critical
Exploitable: 		Remotely

Description:

A query specially crafted to exploit a defect in EDNS option processing can 
cause named to terminate with an assertion failure.

Impact:

Both authoritative and recursive servers are vulnerable to this defect.  
Exploitation of this condition can cause a denial of service in nameservers 
running affected versions of BIND 9.10. Access Control Lists do not provide 
protection.

The bug which causes this condition is in libdns; consequently in addition to 
the named server process other applications (for example: dig and delv) built 
using the libdns library from the affected source distributions can also be 
forced to crash with assertion failures triggered in the same fashion.

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

Workarounds:

No known workarounds at this time.   

Active exploits:

There are no known active exploits.  

Solution:

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

    BIND 9 version 9.10.0-P2

Acknowledgements:

ISC would like to thank Codenomicon for detecting this issue.

Document Revision History:

1.0 Phase One, Advance Notification, 04 June 2014

2.0 Phase Four, Public Disclosure, 11 June 2014

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 product support or about our Subscription
versions of BIND, please visit http://www.dns-co.com/solutions/.

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/mission/contact/.

Note: ISC patches only currently supported versions although when possible we
indicate EOL versions affected.  The latest versions of ISC software can always
be found on our web site at http://www.isc.org/downloads/. There you will find
additional information about each release.

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

This Knowledge Base article https://kb.isc.org/article/AA-01166 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.

© 2001-2014 Internet Systems Consortium

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

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

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
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                On call after hours for member emergencies only.
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