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BIND 9.8.6rc1 Release Notes
Author: Michael McNally Reference Number: AA-01026 Views: 2726 Created: 2013-08-01 06:53 Last Updated: 2013-08-01 21:19 0 Rating/ Voters

BIND 9.8.6rc1 is the first release candidate for BIND 9.8.6.

This document summarizes changes from BIND 9.8.5 to BIND 9.8.6rc1.  Please see the CHANGES file in the source code release for a complete list of all changes.


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


Product support information is available on 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

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]
Feature Changes
  • "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
  • Improved resistance to a theoretical authentication attack based on differential timing.  [RT #33939]
  • named was failing to answer queries during "rndc reload" [RT #34098]
  • 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 addzone" and "rndc delzone" handle non-standard characters in zone names. [RT #33419]
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

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