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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.2"></a>Release Notes for BIND Version 9.11.3</h2></div></div></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_intro"></a>Introduction</h3></div></div></div>
<p>
This document summarizes changes since the last production
release on the BIND 9.11 branch.
Please see the <code class="filename">CHANGES</code> file for a further
list of bug fixes and other changes.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_download"></a>Download</h3></div></div></div>
<p>
The latest versions of BIND 9 software can always be found at
<a class="link" href="http://www.isc.org/downloads/" target="_top">http://www.isc.org/downloads/</a>.
There you will find additional information about each release,
source code, and pre-compiled versions for Microsoft Windows
operating systems.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="root_key"></a>New DNSSEC Root Key</h3></div></div></div>
<p>
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 <span class="command"><strong>managed-keys</strong></span>
statement, or if the pre-configured root key is enabled by using
<span class="command"><strong>dnssec-validation auto</strong></span>, 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
<span class="command"><strong>trusted-keys</strong></span> statement are not automatically
maintained. If your server is performing DNSSEC validation and is
configured using <span class="command"><strong>trusted-keys</strong></span>, 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.
</p>
<p>
This release includes an updated version of the
<code class="filename">bind.keys</code> file containing the new root
key. This file can also be downloaded from
<a class="link" href="https://www.isc.org/bind-keys" target="_top">
https://www.isc.org/bind-keys
</a>.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_license"></a>License Change</h3></div></div></div>
<p>
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).
</p>
<p>
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.
</p>
<p>
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.
</p>
<p>
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 <a class="link" href="https://www.isc.org/mission/contact/" target="_top">
https://www.isc.org/mission/contact/</a>.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="win_support"></a>Legacy Windows No Longer Supported</h3></div></div></div>
<p>
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.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_security"></a>Security Fixes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
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]
</p>
</li>
<li class="listitem">
<p>
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]
</p>
</li>
<li class="listitem">
<p>
With certain RPZ configurations, a response with TTL 0
could cause <span class="command"><strong>named</strong></span> to go into an infinite
query loop. This flaw is disclosed in CVE-2017-3140.
[RT #45181]
</p>
</li>
<li class="listitem">
<p>
Addresses could be referenced after being freed during resolver
processing, causing an assertion failure. The chances of this
happening were remote, but the introduction of a delay in
resolution increased them. This bug is disclosed in
CVE-2017-3145. [RT #46839]
</p>
</li>
<li class="listitem">
<p>
update-policy rules that otherwise ignore the name field now
require that it be set to "." to ensure that any type list
present is properly interpreted. If the name field was omitted
from the rule declaration and a type list was present it wouldn't
be interpreted as expected.
</p>
</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_removed"></a>Removed Features</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
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 <span class="command"><strong>delv</strong></span>.
The DLV key has been removed from <code class="filename">bind.keys</code>.
Setting <span class="command"><strong>dnssec-lookaside</strong></span> to
<span class="command"><strong>auto</strong></span> or to use dlv.isc.org as a trust
anchor results in a warning being issued.
</p>
</li>
<li class="listitem">
<p>
<span class="command"><strong>named</strong></span> will now log a warning if the old
root DNSSEC key is explicitly configured and has not been updated.
[RT #43670]
</p>
</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="proto_changes"></a>Protocol Changes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
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
<a class="link" href="https://github.com/openssl/openssl" target="_top">
https://github.com/openssl/openssl</a>.
[RT #44696]
</p>
</li>
<li class="listitem">
<p>
When parsing DNS messages, EDNS KEY TAG options are checked
for correctness. When printing messages (for example, in
<span class="command"><strong>dig</strong></span>), EDNS KEY TAG options are printed
in readable format.
</p>
</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_changes"></a>Feature Changes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
<span class="command"><strong>named</strong></span> will no longer start or accept
reconfiguration if <span class="command"><strong>managed-keys</strong></span> or
<span class="command"><strong>dnssec-validation auto</strong></span> are in use and
the managed-keys directory (specified by
<span class="command"><strong>managed-keys-directory</strong></span>, and defaulting
to the working directory if not specified),
is not writable by the effective user ID. [RT #46077]
</p>
</li>
<li class="listitem">
<p>
Previously, <span class="command"><strong>update-policy local;</strong></span> 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]
</p>
</li>
<li class="listitem">
<p>
<span class="command"><strong>dig +ednsopt</strong></span> now accepts the names
for EDNS options in addition to numeric values. For example,
an EDNS Client-Subnet option could be sent using
<span class="command"><strong>dig +ednsopt=ecs:...</strong></span>. Thanks to
John Worley of Secure64 for the contribution. [RT #44461]
</p>
</li>
<li class="listitem">
<p>
Threads in <span class="command"><strong>named</strong></span> 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 <span class="command"><strong>ps</strong></span> and
<span class="command"><strong>top</strong></span>, but not the main thread. [RT #43234]
</p>
</li>
<li class="listitem">
<p>
DiG now warns about .local queries which are reserved for
Multicast DNS. [RT #44783]
</p>
</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_bugs"></a>Bug Fixes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
Attempting to validate improperly unsigned CNAME responses
from secure zones could cause a validator loop. This caused
a delay in returning SERVFAIL and also increased the chances
of encountering the crash bug described in CVE-2017-3145.
[RT #46839]
</p>
</li>
<li class="listitem">
<p>
When <span class="command"><strong>named</strong></span> 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 <span class="command"><strong>rndc addzone</strong></span>. Reconfiguration changes
are now fully rolled back in the event of failure. [RT #45841]
</p>
</li>
<li class="listitem">
<p>
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]
</p>
</li>
<li class="listitem">
<p>
Reloading or reconfiguring <span class="command"><strong>named</strong></span> could
fail on some platforms when LMDB was in use. [RT #45203]
</p>
</li>
<li class="listitem">
<p>
Due to some incorrectly deleted code, when BIND was
built with LMDB, zones that were deleted via
<span class="command"><strong>rndc delzone</strong></span> 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]
</p>
</li>
<li class="listitem">
<p>
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]
</p>
</li>
<li class="listitem">
<p>
AD could be set on truncated answer with no records present
in the answer and authority sections. [RT #45140]
</p>
</li>
<li class="listitem">
<p>
Some header files included &lt;isc/util.h&gt; incorrectly as
it pollutes with namespace with non ISC_ macros and this should
only be done by explicitly including &lt;isc/util.h&gt;. This
has been corrected. Some code may depend on &lt;isc/util.h&gt;
being implicitly included via other header files. Such
code should explicitly include &lt;isc/util.h&gt;.
</p>
</li>
<li class="listitem">
<p>
Zones created with <span class="command"><strong>rndc addzone</strong></span> could
temporarily fail to inherit the <span class="command"><strong>allow-transfer</strong></span>
ACL set in the <span class="command"><strong>options</strong></span> section of
<code class="filename">named.conf</code>. [RT #46603]
</p>
</li>
<li class="listitem">
<p>
<span class="command"><strong>named</strong></span> failed to properly determine whether
there were active KSK and ZSK keys for an algorithm when
<span class="command"><strong>update-check-ksk</strong></span> was true (which is the
default setting). This could leave records unsigned
when rolling keys. [RT #46743] [RT #46754] [RT #46774]
</p>
</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="end_of_life"></a>End of Life</h3></div></div></div>
<p>
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.
<a class="link" href="https://www.isc.org/downloads/software-support-policy/" target="_top">https://www.isc.org/downloads/software-support-policy/</a>
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_thanks"></a>Thank You</h3></div></div></div>
<p>
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
<a class="link" href="http://www.isc.org/donate/" target="_top">http://www.isc.org/donate/</a>.
</p>
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