Introduction

   BIND 9.9.6-P2 is the latest production release of BIND 9.9,
   an Extended Support Version (ESV) of BIND 9.

   This document summarizes the feature changes from BIND 9.9.5 to
   BIND 9.9.6-P2.  Entries marked with (**) indicate changes since
   9.9.6-P1

   Please see the CHANGES file in the source code release for a
   complete list of all changes, including bug fixes.

Download

   The latest versions of BIND 9 software can always be found on
   our web site at http://www.isc.org/downloads/. There you will
   find additional information about each release, source code, and
   pre-compiled versions for Microsoft Windows operating systems.

Support

   Professional support is provided by Internet Systems Consortium,
   Inc., doing business as DNSco.  Information about paid support
   options is available at http://www.dns-co.com/solutions/.  Free
   support is provided by our user community via a mailing list.
   Information on all public email lists is available at
   https://www.isc.org/community/mailing-list/.

Security Fixes

   On servers configured to perform DNSSEC validation using managed
   trust anchors (i.e., keys configured explicitly via managed-keys, or
   implicitly via dnssec-validation auto; or dnssec-lookaside auto;),
   revoking a trust anchor and sending a new untrusted replacement could
   cause named to crash with an assertion failure.  This could occur in
   the event of a botched key rollover, or potentially as a result of a
   deliberate attack if the attacker was in position to monitor the
   victim's DNS traffic.  This flaw was discovered by Jan-Piet Mens, and
   is disclosed in [CVE-2015-1349] [RT #38344] (**)

   A flaw in delegation handling could be exploited to put named
   into an infinite loop, in which each lookup of a name server
   triggered additional lookups of more name servers.  This has    
   been addressed by placing limits on the number of levels of
   recursion named will allow (default 7), and on the number of
   queries that it will send before terminating a recursive query
   (default 50).  The recursion depth limit is configured via the
   max-recursion-depth option, and the query limit via the
   max-recursion-queries option.  The flaw was discovered by 
   Florian Maury of ANSSI [CVE-2014-8500] [RT #37580]

New Features

   Support for CAA record types, as described in RFC 6844 "DNS
   Certification Authority Authorization (CAA) Resource Record",
   was added. [RT#36625] [RT #36737]

   Disallow "request-ixfr" from being specified in zone statements
   where it is not valid (it is only valid for slave and redirect
   zones) [RT #36608]

   Support for CDS and CDNSKEY resource record types was added. For
   details see the proposed Informational Internet-Draft "Automating
   DNSSEC Delegation Trust Maintenance" at
   http://tools.ietf.org/html/draft-ietf-dnsop-delegation-trust-maintainance-14.
   [RT #36333]

   Added version printing options to various BIND utilities. [RT #26057]
   [RT #10686]

   On Windows, enable the Python tools "dnssec-coverage" and
   "dnssec-checkds". [RT #34355]

   Added a "no-case-compress" ACL, which causes named to use
   case-insensitive compression (disabling change #3645) for specified
   clients. (This is useful when dealing with broken client
   implementations that use case-sensitive name comparisons, rejecting
   responses that fail to match the capitalization of the query
   that was sent.) [RT #35300]

Feature Changes

   Adds RPZ SOA to the additional section of responses to clearly
   indicate the use of RPZ in a manner that is intended to avoid
   causing issues for downstream resolvers and forwarders [RT #36507]

   rndc now gives distinct error messages when an unqualified zone
   name matches multiple views vs. matching no views [RT #36691]

   Improves the accuracy of dig's reported round trip times.  [RT #36611]

   The Windows installer now places files in the Program Files area
   rather than system services. [RT #35361]

   When an SPF record exists in a zone but no equivalent TXT record
   does, a warning will be issued.  The warning for the reverse
   condition is no longer issued. See the check-spf option in the
   documentation for details. [RT #36210]

   "named" will now log explicitly when using rndc.key to configure
   command channel. [RT #35316]

   The default setting for the -U option (setting the number of UDP
   listeners per interface) has been adjusted to improve performance.
   [RT #35417]

   Aging of smoothed round-trip time measurements is now limited
   to no more than once per second, to improve accuracy in selecting
   the best name server. [RT #32909]

   DNSSEC keys that have been marked active but have no publication
   date are no longer presumed to be publishable. [RT #35063]

Bug Fixes

   The Makefile in bin/python was changed to work around a bmake
   bug in FreeBSD 10 and NetBSD 6. [RT #36993]

   Corrected bugs in the handling of wildcard records by the DNSSEC
   validator: invalid wildcard expansions could be treated as valid
   if signed, and valid wildcard expansions in NSEC3 opt-out ranges
   had the AD bit set incorrectly in responses. [RT #37093] [RT #37072]

   When resigning, dnssec-signzone was removing all signatures from
   delegation nodes. It now retains DS and (if applicable) NSEC
   signatures.  [RT #36946]

   The AD flag was being set inappopriately on RPZ responses. [RT #36833]

   Updates the URI record type to current draft standard,
   draft-faltstrom-uri-08, and allows the value field to be zero
   length [RT #36642] [RT #36737]

   RRSIG sets that were not loaded in a single transaction at start
   up were not being correctly added to re-signing heaps.  [RT #36302]

   Setting '-t aaaa' in .digrc had unintended side-effects. [RT #36452]

   A race condition could cause a crash in isc_event_free during
   shutdown.  [RT #36720]

   Addresses a race condition issue in dispatch. [RT #36731]

   acl elements could be miscounted, causing a crash while loading
   a config [RT #36675]

   Corrects a deadlock between view.c and adb.c. [RT #36341]

   liblwres wasn't properly handling link-local addresses in
   nameserver clauses in resolv.conf. [RT #36039]

   Buffers in isc_print_vsnprintf were not properly initialized
   leading to potential overflows when printing out quad values.
   [RT #36505]

   Don't call qsort() with a null pointer, and disable the GCC 4.9
   "delete null pointer check" optimizer option. This fixes problems
   when using GNU GCC 4.9.0 where its compiler code optimizations
   may cause crashes in BIND. For more information, see the operational
   advisory at https://kb.isc.org/article/AA-01167/. [RT #35968]

   Fixed a bug that could cause repeated resigning of records in
   dynamically signed zones. [RT #35273]

   Fixed a bug that could cause an assertion failure after forwarding
   was disabled. [RT #35979]

   Fixed a bug that caused SERVFAILs when using RPZ on a system
   configured as a forwarder. [RT #36060]

   Worked around a limitation in Solaris's /dev/poll implementation
   that could cause named to fail to start when configured to use
   more sockets than the system could accomodate. [RT #35878]

Thank You

   Thank you to everyone who assisted us in making this release
   possible. If you would like to contribute to ISC to assist us
   in continuing to make quality open source software, please visit
   our donations page at http://www.isc.org/donate/.

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