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
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


   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.


   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
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   None known.

Active exploits:

   No known active exploits.


   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 for a complete listing of
Security Vulnerabilities and versions affected.

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   indicate EOL versions affected.  (For current information on
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