Release Notes for BIND Version 9.9.11

Introduction

   This document summarizes significant changes since the last production
   release of BIND on the corresponding major release branch. Please see
   the CHANGES file for a further list of bug fixes and other changes.

Download

   The latest versions of BIND 9 software can always be found 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.

New DNSSEC Root Key

   ICANN is in the process of introducing a new Key Signing Key (KSK) for
   the global root zone. BIND has multiple methods for managing DNSSEC
   trust anchors, with somewhat different behaviors. If the root key is
   configured using the managed-keys statement, or if the pre-configured
   root key is enabled by using dnssec-validation auto, then BIND can keep
   keys up to date automatically. Servers configured in this way should
   have begun the process of rolling to the new key when it was published
   in the root zone in July 2017. However, keys configured using the
   trusted-keys statement are not automatically maintained. If your server
   is performing DNSSEC validation and is configured using trusted-keys,
   you are advised to change your configuration before the root zone
   begins signing with the new KSK. This is currently scheduled for
   October 11, 2017.

   This release includes an updated version of the bind.keys file
   containing the new root key. This file can also be downloaded from
   https://www.isc.org/bind-keys .

Windows XP No Longer Supported

   As of BIND 9.9.11, Windows XP is no longer a supported platform for
   BIND, and Windows XP binaries are no longer available for download from
   ISC.

Security Fixes

     * An error in TSIG handling could permit unauthorized zone transfers
       or zone updates. These flaws are disclosed in CVE-2017-3142 and
       CVE-2017-3143. [RT #45383]
     * The BIND installer on Windows used an unquoted service path, which
       can enable privilege escalation. This flaw is disclosed in
       CVE-2017-3141. [RT #45229]
     * With certain RPZ configurations, a response with TTL 0 could cause
       named to go into an infinite query loop. This flaw is disclosed in
       CVE-2017-3140. [RT #45181]

Feature Changes

     * Threads in named are now set to human-readable names to assist
       debugging on operating systems that support that. Threads will have
       names such as "isc-timer", "isc-sockmgr", "isc-worker0001", and so
       on. This will affect the reporting of subsidiary thread names in ps
       and top, but not the main thread. [RT #43234]
     * DiG now warns about .local queries which are reserved for Multicast
       DNS. [RT #44783]

Bug Fixes

     * Fixed a bug that was introduced in an earlier development release
       which caused multi-packet AXFR and IXFR messages to fail validation
       if not all packets contained TSIG records; this caused
       interoperability problems with some other DNS implementations. [RT
       #45509]
     * Semicolons are no longer escaped when printing CAA and URI records.
       This may break applications that depend on the presence of the
       backslash before the semicolon. [RT #45216]
     * AD could be set on truncated answer with no records present in the
       answer and authority sections. [RT #45140]

End of Life

   BIND 9.9 (Extended Support Version) will be supported until at least
   June, 2018. https://www.isc.org/downloads/software-support-policy/

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/.