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. (c) 2001-2013 Internet Systems Consortium