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<section xmlns:db="http://docbook.org/ns/docbook" version="5.0"><info/>

<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="noteversion.xml"/>

<section xml:id="relnotes_intro"><info><title>Introduction</title></info>

<para>

This document summarizes changes since the last production

release on the BIND 9.11 branch.

Please see the <filename>CHANGES</filename> file for a further

list of bug fixes and other changes.

</para>

</section>

<section xml:id="relnotes_download"><info><title>Download</title></info>

<para>

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

<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.isc.org/downloads/">http://www.isc.org/downloads/</link>.

There you will find additional information about each release,

source code, and pre-compiled versions for Microsoft Windows

operating systems.

</para>

</section>

<section xml:id="root_key"><info><title>New DNSSEC Root Key</title></info>

<para>

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 <command>managed-keys</command>

statement, or if the pre-configured root key is enabled by using

<command>dnssec-validation auto</command>, 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

<command>trusted-keys</command> statement are not automatically

maintained. If your server is performing DNSSEC validation and is

configured using <command>trusted-keys</command>, 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.

</para>

<para>

This release includes an updated version of the

<filename>bind.keys</filename> file containing the new root

key. This file can also be downloaded from

<link xmlns:xlink="http://www.w3.org/1999/xlink"

xlink:href="https://www.isc.org/bind-keys">

https://www.isc.org/bind-keys

</link>.

</para>

</section>

<section xml:id="relnotes_license"><info><title>License Change</title></info>

<para>

With the release of BIND 9.11.0, ISC changed to the open

source license for BIND from the ISC license to the Mozilla

Public License (MPL 2.0).

</para>

<para>

The MPL-2.0 license requires that if you make changes to

licensed software (e.g. BIND) and distribute them outside

your organization, that you publish those changes under that

same license. It does not require that you publish or disclose

anything other than the changes you made to our software.

</para>

<para>

This requirement will not affect anyone who is using BIND, with

or without modifications, without redistributing it, nor anyone

redistributing it without changes. Therefore, this change will be

without consequence for most individuals and organizations who are

using BIND.

</para>

<para>

Those unsure whether or not the license change affects their

use of BIND, or who wish to discuss how to comply with the

license may contact ISC at <link

xmlns:xlink="http://www.w3.org/1999/xlink"

xlink:href="https://www.isc.org/mission/contact/">

https://www.isc.org/mission/contact/</link>.

</para>

</section>

<section xml:id="win_support"><info><title>Legacy Windows No Longer Supported</title></info>

<para>

As of BIND 9.11.2, Windows XP and Windows 2003 are no longer supported

platforms for BIND; "XP" binaries are no longer available for download

from ISC.

</para>

</section>

<section xml:id="relnotes_security"><info><title>Security Fixes</title></info>

<itemizedlist>

<listitem>

<para>

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]

</para>

</listitem>

<listitem>

<para>

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]

</para>

</listitem>

<listitem>

<para>

With certain RPZ configurations, a response with TTL 0

could cause <command>named</command> to go into an infinite

query loop. This flaw is disclosed in CVE-2017-3140.

[RT #45181]

</para>

</listitem>

</itemizedlist>

</section>

<section xml:id="proto_changes"><info><title>Protocol Changes</title></info>

<itemizedlist>

<listitem>

<para>

BIND can now use the Ed25519 and Ed448 Edwards Curve DNSSEC

signing algorithms described in RFC 8080. Note, however, that

these algorithms must be supported in OpenSSL;

currently they are only available in the development branch

of OpenSSL at

<link xmlns:xlink="http://www.w3.org/1999/xlink"

xlink:href="https://github.com/openssl/openssl">

https://github.com/openssl/openssl</link>.

[RT #44696]

</para>

</listitem>

<listitem>

<para>

When parsing DNS messages, EDNS KEY TAG options are checked

for correctness. When printing messages (for example, in

<command>dig</command>), EDNS KEY TAG options are printed

in readable format.

</para>

</listitem>

</itemizedlist>

</section>

<section xml:id="relnotes_changes"><info><title>Feature Changes</title></info>

<itemizedlist>

<listitem>

<para>

The ISC DNSSEC Lookaside Validation (DLV) service has been shut

down; all DLV records in the dlv.isc.org zone have been removed.

References to the service have been removed from BIND documentation.

Lookaside validation is no longer used by default by

<command>delv</command>. The DLV key has been removed from

<filename>bind.keys</filename>. [RT #46155]

</para>

</listitem>

<listitem>

<para>

Previously, <command>update-policy local;</command> accepted

updates from any source so long as they were signed by the

locally-generated session key. This has been further restricted;

updates are now only accepted from locally configured addresses.

[RT #45492]

</para>

</listitem>

<listitem>

<para>

<command>dig +ednsopt</command> now accepts the names

for EDNS options in addition to numeric values. For example,

an EDNS Client-Subnet option could be sent using

<command>dig +ednsopt=ecs:...</command>. Thanks to

John Worley of Secure64 for the contribution. [RT #44461]

</para>

</listitem>

<listitem>

<para>

Threads in <command>named</command> 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 <command>ps</command> and

<command>top</command>, but not the main thread. [RT #43234]

</para>

</listitem>

<listitem>

<para>

DiG now warns about .local queries which are reserved for

Multicast DNS. [RT #44783]

</para>

</listitem>

</itemizedlist>

</section>

<section xml:id="relnotes_bugs"><info><title>Bug Fixes</title></info>

<itemizedlist>

<listitem>

<para>

When <command>named</command> was reconfigured, failure of some

zones to load correctly could leave the system in an inconsistent

state; while generally harmless, this could lead to a crash later

when using <command>rndc addzone</command>. Reconfiguration changes

are now fully rolled back in the event of failure. [RT #45841]

</para>

</listitem>

<listitem>

<para>

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]

</para>

</listitem>

<listitem>

<para>

Reloading or reconfiguring <command>named</command> could

fail on some platforms when LMDB was in use. [RT #45203]

</para>

</listitem>

<listitem>

<para>

Due to some incorrectly deleted code, when BIND was

built with LMDB, zones that were deleted via

<command>rndc delzone</command> were removed from the

running server but were not removed from the new zone

database, so that deletion did not persist after a

server restart. This has been corrected. [RT #45185]

</para>

</listitem>

<listitem>

<para>

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]

</para>

</listitem>

<listitem>

<para>

AD could be set on truncated answer with no records present

in the answer and authority sections. [RT #45140]

</para>

</listitem>

</itemizedlist>

</section>

<section xml:id="end_of_life"><info><title>End of Life</title></info>

<para>

The end of life for BIND 9.11 is yet to be determined but

will not be before BIND 9.13.0 has been released for 6 months.

<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://www.isc.org/downloads/software-support-policy/">https://www.isc.org/downloads/software-support-policy/</link>

</para>

</section>

<section xml:id="relnotes_thanks"><info><title>Thank You</title></info>

<para>

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

<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.isc.org/donate/">http://www.isc.org/donate/</link>.

</para>

</section>

</section>