Introduction

   BIND 9.9.4b1 is the first beta release of BIND 9.9.4.

   This document summarizes changes from BIND 9.9.3 to BIND 9.9.4b1.
   Please see the CHANGES file in the source code release for a
   complete list of all changes.

Download

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

Support

   Product support information is available on
   http://www.isc.org/services/support for paid support options.
   Free support is provided by our user community via a mailing
   list. Information on all public email lists is available at
   https://lists.isc.org/mailman/listinfo.

Security Fixes

   Prevents exploitation of a runtime_check which can crash named
   when satisfying a recursive query for particular malformed zones.
   (CVE-2013-3919) [RT #33690]

New Features

   Added Response Rate Limiting (RRL) functionality to reduce the
   effectiveness of DNS as an amplifier for reflected denial-of-service
   attacks by rate-limiting substantially-identical responses. [RT
   #28130]

Feature Changes

   Addressed compatibility issues with newer versions of Microsoft
   Visual Studio. [RT #33916]

   Improved the 'rndc' man page. [RT #33506]

   'named -g' now no longer works with an invalid logging configuration.
   [RT #33473]

   The default (and minimum) value for tcp-listen-queue is now 10
   instead of 3.  This is a subtle control setting (not applicable
   to all OS environments).  When there is a high rate of inbound
   TCP connections, it controls how many connections can be queued
   before they are accepted by named.  Once this limit is exceeded,
   new TCP connections will be rejected.  Note however that a value
   of 10 does not imply a strict limit of 10 queued TCP connections
   - the impact of changing this configuration setting will be
   OS-dependent.  Larger values for tcp-listen queue will permit
   more pending tcp connections, which may be needed where there
   is a high rate of TCP-based traffic (for example in a dynamic
   environment where there are frequent zone updates and transfers).
   For most production servers the new default value of 10 should
   be adequate.  [RT #33029]

   Added support for OpenSSL versions 0.9.8y, 1.0.0k, and 1.0.1e
   with PKCS#11. [RT #33463]

   Added logging messages on slave servers when they forward DDNS
   updates to a master. [RT #33240]

   Changed the logging category for RRL events from 'queries' to
   'query-errors'. [RT #33540]

Bug Fixes

   The build of BIND now installs isc/stat.h so that it's available
   to /isc/file.h when building other applications that reference
   these header files - for example dnsperf (see Debian bug ticket
   #692467).  [RT #33056]

   Better handle failures building XML for stats channel responses.
   [RT #33706]

   Fixed a memory leak in GSS-API processing. [RT #33574]

   Fixed an acache-related race condition that could cause a crash.
   [RT #33602]

   rndc now properly fails when given an invalid '-c' argument. [RT
   #33571]

   Fixed an issue with the handling of zero TTL records that could
   cause improper SERVFAILs. [RT #33411]

   Fixed a crash-on-shutdown race condition with DNSSEC validation.
   [RT #33573]

   Corrected the way that "rndc adzone" and "rndc delzone" handle
   non-standard characters in zone names. [RT #33419]

   Adjusted RRL behavior for recursive queries to defer rate-limiting
   until after recursion is complete.  Also uses correct rcode for
   slipped NXDOMAIN responses. [RT #33604]

   Previously, BIND could erroneously report a missing file
   specification when using inline slave zones.  [RT #33662]

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/supportisc.

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