CVE-2014-0591: A Crafted Query Against an NSEC3-signed Zone Can Crash BIND

[Michael McNally]

CVE:                   CVE-2014-0591
Document Version:      2.0
Posting date:          13 Jan 2014
Program Impacted:      BIND
Versions affected:     9.6.0.x -> 9.6-ESV-R10-P1, 9.7 (all versions),
                       9.8.0 -> 9.8.6-P1, 9.9.0 -> 9.9.4-P1.
                       Development releases 9.6-ESV-R11b1, 9.8.7b1,
                       and 9.9.5b1 are also affected.
Severity:              High
Exploitable:           Remotely
Description:

   Because of a defect in handling queries for NSEC3-signed zones,
   BIND can crash with an "INSIST" failure in name.c when processing
   queries possessing certain properties. By exploiting this defect
   an attacker deliberately constructing a query with the right
   properties could achieve denial of service against an authoritative
   nameserver serving NSEC3-signed zones.

   Please Note: Versions of BIND 9.7 are also affected, but this
   branch is beyond its "end of life" (EOL) and no longer receives
   testing or security fixes from ISC. For current information on
   which versions are actively supported, please see
   http://www.isc.org/downloads/software-support-policy/bind-software-status/.

Impact:

   Authoritative nameservers serving at least one NSEC3-signed zone
   are vulnerable to this defect.  Recursive-only servers are not
   at risk.  Authoritative servers which do not serve NSEC3-signed
   zones are not at risk.

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:

   None.

Active exploits: 

   There are no known active exploits but limited discussion of
   this issue has taken place on a public mailing list.

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 9.6-ESV-R10-P2
      BIND 9 version 9.8.6-P2
      BIND 9 version 9.9.4-P2 

Acknowledgements:

   ISC would like to thank Jared Mauch for reporting this issue.

Document Revision History:

   1.0 Phase One, Advance Notification 06 January, 2014
   1.1 Phase One+, Advance Notification 08 January, 2014
   1.2 Phase Two & Three, Advance Notification 10 January, 2014
   1.3 Changed CVSS Equation to Vector and edited Exploits 11 January, 2014
   2.0 Phase Four, Public Release 13 January, 2014

Related Documents:

   See our BIND Security Matrix for a complete listing of Security
   Vulnerabilities and versions affected. https://kb.isc.org/article/AA-00913

   If you'd like more information on our ISC Member program please
   visit https://www.isc.org/members or for product support please
   visit http://www.dns-co.com/solutions

Do you still have questions?  Questions regarding this advisory
should go to security-officer at isc.org.  To report a new issue,
please encrypt your message using security-officer at 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. 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 -- ISC Software Defect and Security Vulnerability
   Disclosure Policy:  https://kb.isc.org/article/AA-00861


This Knowledge Base article https://kb.isc.org/article/AA-01078
is the complete and official security advisory document.

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