CVE-2016-1286: A problem parsing resource record signatures for DNAME resource records can lead to an assertion failure in resolver.c or db.c

Michael McNally mcnally at isc.org
Wed Mar 9 21:05:37 UTC 2016


CVE:                   CVE-2016-1286
Document Version:      2.0
Posting date:          09 March 2016
Program Impacted:      BIND
Versions affected:     9.0.0 -> 9.8.8, 9.9.0 -> 9.9.8-P3,
                       9.9.3-S1 -> 9.9.8-S5, 9.10.0 -> 9.10.3-P3
Severity:              High
Exploitable:           Remotely

Description:

   An error when parsing signature records for DNAME records having
   specific properties can lead to named exiting due to an assertion
   failure in resolver.c or db.c.

Impact:

   An attacker able to cause a server to make a query deliberately
   chosen to generate a response containing a signature record which
   would exercise this vulnerability can cause named to stop execution
   with an assertion failure, resulting in denial of service to
   clients.  Recursive resolvers are at the highest risk of
   vulnerability to this attack but authoritative-only servers may
   be also be vulnerable if the attacker can control the answers
   for records requested when the authoritative server is performing
   service on zones (e.g. a slave server doing SOA queries.)  Servers
   may be affected even if they are not performing validation or
   have DNSSEC disabled entirely as long as they receive a response
   containing offending signature records.  Disabling DNSSEC does
   not provide protection against this vulnerability.

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 known.

Active exploits:

   No known active exploits.

Solution:

   Upgrade to the patched release most closely related to your
   current version of BIND:

   - BIND 9 version 9.9.8-P4
   - BIND 9 version 9.10.3-P4

   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-S6

Document Revision History:

   1.0 Advance Notification 02 March 2016
   1.1 "Versions affected" and "Solution" text expanded to cover BIND 9
       Supported Preview Edition; "Versions affected" and "Impact" text
       expanded to cover all old versions. 07 March 2016
   2.0 Public Disclosure.  09 March 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 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/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-01353 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


More information about the bind-announce mailing list