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BIND 9.9.4-S1rc2 Release Notes
Author: Reference Number: AA-01052 Views: 20263 Created: 2013-09-05 16:55 Last Updated: 2013-09-05 19:25 0 Rating/ Voters


BIND 9.9.4-S1rc2 is the second release candidate for BIND 9.9.4 Subscription Edition. (We did not publish the rc1 release notes.)

The BIND Subscription Edition is a special release of BIND featuring new functionality not yet published in the publicly available BIND 9 branch.

This release is branched from BIND 9.9.4, and includes the following features:

  • Response Rate Limiting, a method of blunting the effect of DNS amplification and reflection attacks.
  • Multiple response policy zones (RPZ) can be configured. RPZ performance is substantially improved.
  • GeoIP ACL support, allowing ACL restrictions based on a client's geographic location (as obtained from the MaxMind GeoIP databases).
  • Support for configuring multiple Dynamically Loadable Zone (DLZ) modules. A specific DLZ database can be identified as the source of a zone configured in named.conf. Type-redirect zones, used for NXDOMAIN redirection, can now be sourced from a DLZ database.
  • Enhanced server statistics, including a new JSON format statistics channel.
  • Support for setting Differentiated Services Code Point (DSCP) values on outgoing traffic.

This document summarizes changes from BIND 9.9.3-S1 to BIND 9.9.4-S1rc2. Changes since the previous development release are marked with asterisks (**). For a detailed list of user-visible changes from previous releases, see the CHANGES file. For a specific list of detailed changes that have been applied to the Subscription Edition, see the CHANGES.SE file. For up-to-date release notes and errata, see

Security Fixes
  • Previously an error in bounds checking on the private type 'keydata' could be used to deny service through a deliberately triggerable REQUIRE failure (CVE-2013-4854).  [RT #34238] **
  • 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
  • "rndc flushtree" now flushes matching records in the address database and bad cache as well as the DNS cache.  Previously only the DNS cache was flushed. [RT #33790]
Feature Changes
  • rndc status now also shows the build-id. [RT #20422] **
  • Improved OPT pseudo-record processing to make it easier to support new EDNS options. [RT #34414] **
  • "configure" now finishes by printing a summary of optional BIND features and whether they are active or inactive. ("configure --enable-full-report" increases the verbosity of the summary.) [RT #31777] **
  • 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]
Bug Fixes
  • Fixed the "allow-query-on" option to correctly check the destination address. [RT #34590] **
  • Fix forwarding for forward only "zones" beneath automatic empty zones. [RT #34583] **
  • Fix DNSSEC auto maintenance so signatures can be removed from a zone with only KSK keys for an algorithm. [RT #34439] **
  • Fix DNSSEC auto maintenance so signatures from newly inactive keys are removed (when publishing a new key while deactivating another key at the same time). [RT #32178] **
  • Remove bogus warning log message about missing signatures when receiving a query for a SIG record. [RT #34600] **
  • Fix Response Policy Zones on slave servers so new RPZ changes take effect. [RT #34450] **
  • Fix the "zone-statistics" option to work with the default traditional statistics (not new "--enable-newstats" feature). [RT #34466] **
  • Restore RPZ "recursive-only no;" to working order when delegation is needed. [RT #33776] **
  • Eliminate an unnecessary lock/unlock cycle when incrementing cache statistics which was causing a performance drop under heavy load. [RT #34339] **
  • named could crash when deleting inline-signing zones with "rndc delzone". [RT #34066] **
  • Improved resistance to a theoretical authentication attack based on differential timing.  [RT #33939] **
  • named was failing to answer queries during "rndc reload" [RT #34098] **
  • win32: Some executables had been omitted from the installer. [RT #34116] **
  • Fixed a broken 'Invalid keyfile' error message in dnssec-keygen. [RT #34045] **
  • 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

ISC is grateful for the support of our BIND 9 subscription customers, which allows us to continue improving our software.

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For assistance with problems and questions for which you have not been able to find an answer in our Knowledge Base, we recommend searching our community mailing list archives and/or posting your question there (you will need to register there first for your posts to be accepted). The bind-users and the dhcp-users lists particularly have a long-standing and active membership.

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