Bind9 CVE announces

Objet 	CVE-2017-3138: named exits with a REQUIRE assertion failure if it receives a null command string on its control channel

CVE:                 CVE-2017-3138
Document Version:    2.0
Posting date:        12 April 2017
Program Impacted:    BIND
Versions affected:   9.9.9->9.9.9-P7, 9.9.10b1->9.9.10rc2,
9.10.4->9.10.4-P7,
                     9.10.5b1->9.10.5rc2, 9.11.0->9.11.0-P4,
                     9.11.1b1->9.11.1rc2, 9.9.9-S1->9.9.9-S9
Severity:            Medium
Exploitable:         Remotely, from hosts that are within the ACL permitted
                     access to the control channel

Description:

   named contains a feature which allows operators to issue commands
   to a running server by communicating with the server process
   over a control channel, using a utility program such as rndc.

   A regression introduced in a recent feature change has created
   a situation under which some versions of named can be caused
   to exit with a REQUIRE assertion failure if they are sent a
   null command string.

Impact:

   The BIND control channel is not configured by default, but when
   configured will accept commands from those IP addresses that
   are specified in its access control list and/or from clients
   which present the proper transaction key.  Using this defect,
   an attacker can cause a running server to stop if they can get
   it to accept control channel input from them.  In most instances
   this is not as bad as it sounds, because existing commands
   permitted over the control channel (i.e. "rndc stop") can already
   be given to cause the server to stop.

   However, BIND 9.11.0 introduced a new option to allow "read
   only" commands over the command channel.  Using this restriction,
   a server can be configured to limit specified clients to giving
   control channel commands which return information only (e.g.
   "rndc status") without affecting the operational state of the
   server.  The defect described in this advisory, however, is not
   properly stopped by the "read only" restriction, in essence
   permitting a privilege escalation allowing a client which should
   only be permitted the limited set of "read only" operations to
   cause the server to stop execution.

CVSS Score:          6.5
CVSS Vector:         CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Workarounds:

   None.  However, in a properly configured server, access to the
   control channel should already be limited by either network
   ACLs, TSIG keys, or both.

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 9.9.9-P8
   -  BIND 9 version 9.10.4-P8
   -  BIND 9 version 9.11.0-P5

   BIND Supported Preview Edition is a special feature preview
   branch of BIND provided to eligible ISC support customers.

   -  BIND 9 version 9.9.9-S10

   New development releases of BIND are also available which
   contain the fix for this vulnerability.

   -  BIND 9 version 9.9.10rc3
   -  BIND 9 version 9.10.5rc3
   -  BIND 9 version 9.11.1rc3

Acknowledgements:

   ISC would like to thank Mike Lalumiere of Dyn, Inc., for bringing
   this issue to our attention.

Document Revision History:

   1.0 Advance Notification 20 March 2017
   1.1 Revised Acknowledgements and Versions Affected 22 March 2017
   1.2 Added mention of maintenance releases to the Solution section
       31 March 2017
   2.0 Public Announcement 12 April 2017
   
   
----------------------------------------------------
   
Objet 	CVE-2017-3137: A response packet can cause a resolver to terminate when processing an answer containing a CNAME or DNAME

CVE:                 CVE-2017-3137
Document Version:    2.0
Posting date:        12 April 2017
Program Impacted:    BIND
Versions affected:   9.9.9-P6, 9.9.10b1->9.9.10rc1, 9.10.4-P6,
                     9.10.5b1->9.10.5rc1, 9.11.0-P3, 9.11.1b1->9.11.1rc1,
                     and 9.9.9-S8
Severity:            High
Exploitable:         Remotely

Description:

   Mistaken assumptions about the ordering of records in the answer
   section of a response containing CNAME or DNAME resource records
   could lead to a situation in which named would exit with an
   assertion failure when processing a response in which records
   occurred in an unusual order.

Impact:

   A server which is performing recursion can be forced to exit
   with an assertion failure if it can be caused to receive a
   response containing CNAME or DNAME resource records with certain
   ordering.  An attacker can cause a denial of service by exploiting
   this condition.  Recursive resolvers are at highest risk but
   authoritative servers are theoretically vulnerable if they perform
   recursion.

CVSS Score:          7.5
CVSS Vector:         CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Workarounds:

   None known.

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 9.9.9-P8
   -  BIND 9 version 9.10.4-P8
   -  BIND 9 version 9.11.0-P5

   BIND Supported Preview Edition is a special feature preview
   branch of BIND provided to eligible ISC support customers.

   -  BIND 9 version 9.9.9-S10

   New development releases of BIND are also available which contain
   the fix for this vulnerability:

   -  BIND 9 version 9.9.10rc3
   -  BIND 9 version 9.10.5rc3
   -  BIND 9 version 9.11.1rc3

Document Revision History:

   1.0 Advance Notification 08 March 2017
   1.1 Revised Posting Date; Added pre-releases to Versions Affected
       20 March 2017
   1.2 Revised patch release versions 12 April 2017
   2.0 Public Announcement 12 April 2017
   
   
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Objet 	CVE-2017-3136: An error handling synthesized records could cause an assertion failure when using DNS64 with "break-dnssec yes;"

CVE:                 CVE-2017-3136
Document Version:    2.0
Posting date:        12 April 2017
Program Impacted:    BIND
Versions affected:   9.8.0 -> 9.8.8-P1, 9.9.0 -> 9.9.9-P6,
9.9.10b1->9.9.10rc1,
                     9.10.0 -> 9.10.4-P6, 9.10.5b1->9.10.5rc1,
                     9.11.0 -> 9.11.0-P3, 9.11.1b1->9.11.1rc1,
                     9.9.3-S1 -> 9.9.9-S8
Severity:            Medium, but only a risk to systems with
                     specific configurations
Exploitable:         Remotely

Description:

   A query with a specific set of characteristics could cause a
   server using DNS64 to encounter an assertion failure and terminate.

   An attacker could deliberately construct a query, enabling
   denial-of-service against a server if it was configured to use
   the DNS64 feature and other preconditions were met.

Impact:

   Servers are at risk if they are configured to use DNS64 and if
   the option "break-dnssec yes;" is in use.

CVSS Score:          5.9
CVSS Vector:         CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Workarounds:

   Servers which have configurations which require DNS64 and
   "break-dnssec yes;" should upgrade.  Servers which are not using
   these features in conjunction are not at risk from this defect.

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 9.9.9-P8
   -  BIND 9 version 9.10.4-P8
   -  BIND 9 version 9.11.0-P5

   BIND Supported Preview Edition is a special feature preview
   branch of BIND provided to eligible ISC support customers.

   -  BIND 9 version 9.9.9-S10

   New development releases of BIND are also available which contain
   the fix for this vulnerability:

   -  BIND 9 version 9.9.10rc3
   -  BIND 9 version 9.10.5rc3
   -  BIND 9 version 9.11.1rc3

Acknowledgements:

   ISC would like to thank Oleg Gorokhov of Yandex for making us
   aware of this vulnerability.

Document Revision History:

   1.0 Advance Notification 08 March 2017
   1.1 Revised Publication Date; Added pre-releases to Versions Affected
       20 March 2017
   2.0 Public Announcement 12 April 2017