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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="article" lang="en"><div class="sect1" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id2542126"></a>Release Notes for BIND Version 9.11.0pre-alpha</h2></div></div></div>
<div class="sect2" lang="en">
<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
of BIND on the corresponding major release branch.
</p>
</div>
<div class="sect2" lang="en">
<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 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="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_security"></a>Security Fixes</h3></div></div></div>
<div class="itemizedlist"><ul type="disc">
<li>
<p>
On servers configured to perform DNSSEC validation, an
assertion failure could be triggered on answers from
a specially configured server.
</p>
<p>
This flaw was discovered by Breno Silveira Soares, and is
disclosed in CVE-2015-4620. [RT #39795]
</p>
</li>
<li>
<p>
On servers configured to perform DNSSEC validation using
managed trust anchors (i.e., keys configured explicitly
via <span><strong class="command">managed-keys</strong></span>, or implicitly
via <span><strong class="command">dnssec-validation auto;</strong></span> or
<span><strong class="command">dnssec-lookaside auto;</strong></span>), revoking
a trust anchor and sending a new untrusted replacement
could cause <span><strong class="command">named</strong></span> to crash with an
assertion failure. This could occur in the event of a
botched key rollover, or potentially as a result of a
deliberate attack if the attacker was in position to
monitor the victim's DNS traffic.
</p>
<p>
This flaw was discovered by Jan-Piet Mens, and is
disclosed in CVE-2015-1349. [RT #38344]
</p>
</li>
<li>
<p>
A flaw in delegation handling could be exploited to put
<span><strong class="command">named</strong></span> into an infinite loop, in which
each lookup of a name server triggered additional lookups
of more name servers. This has been addressed by placing
limits on the number of levels of recursion
<span><strong class="command">named</strong></span> will allow (default 7), and
on the number of queries that it will send before
terminating a recursive query (default 50).
</p>
<p>
The recursion depth limit is configured via the
<code class="option">max-recursion-depth</code> option, and the query limit
via the <code class="option">max-recursion-queries</code> option.
</p>
<p>
The flaw was discovered by Florian Maury of ANSSI, and is
disclosed in CVE-2014-8500. [RT #37580]
</p>
</li>
<li>
<p>
Two separate problems were identified in BIND's GeoIP code that
could lead to an assertion failure. One was triggered by use of
both IPv4 and IPv6 address families, the other by referencing
a GeoIP database in <code class="filename">named.conf</code> which was
not installed. Both are covered by CVE-2014-8680. [RT #37672]
[RT #37679]
</p>
<p>
A less serious security flaw was also found in GeoIP: changes
to the <span><strong class="command">geoip-directory</strong></span> option in
<code class="filename">named.conf</code> were ignored when running
<span><strong class="command">rndc reconfig</strong></span>. In theory, this could allow
<span><strong class="command">named</strong></span> to allow access to unintended clients.
</p>
</li>
</ul></div>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_features"></a>New Features</h3></div></div></div>
<div class="itemizedlist"><ul type="disc">
<li>
<p>
New quotas have been added to limit the queries that are
sent by recursive resolvers to authoritative servers
experiencing denial-of-service attacks. When configured,
these options can both reduce the harm done to authoritative
servers and also avoid the resource exhaustion that can be
experienced by recursives when they are being used as a
vehicle for such an attack.
</p>
<div class="itemizedlist"><ul type="circle">
<li><p>
<code class="option">fetches-per-server</code> limits the number of
simultaneous queries that can be sent to any single
authoritative server. The configured value is a starting
point; it is automatically adjusted downward if the server is
partially or completely non-responsive. The algorithm used to
adjust the quota can be configured via the
<code class="option">fetch-quota-params</code> option.
</p></li>
<li><p>
<code class="option">fetches-per-zone</code> limits the number of
simultaneous queries that can be sent for names within a
single domain. (Note: Unlike "fetches-per-server", this
value is not self-tuning.)
</p></li>
</ul></div>
<p>
Statistics counters have also been added to track the number
of queries affected by these quotas.
</p>
</li>
<li><p>
New statistics counters have been added to track traffic
sizes, as specified in RSSAC002. Query and response
message sizes are broken up into ranges of histogram buckets:
TCP and UDP queries of size 0-15, 16-31, ..., 272-288, and 288+,
and TCP and UDP responses of size 0-15, 16-31, ..., 4080-4095,
and 4096+. These values can be accessed via the XML and JSON
statistics channels at, for example,
<a href="http://localhost:8888/xml/v3/traffic" target="_top">http://localhost:8888/xml/v3/traffic</a>
or
<a href="http://localhost:8888/json/v1/traffic" target="_top">http://localhost:8888/json/v1/traffic</a>.
</p></li>
<li><p>
The serial number of a dynamically updatable zone can
now be set using
<span><strong class="command">rndc signing -serial <em class="replaceable"><code>number</code></em> <em class="replaceable"><code>zonename</code></em></strong></span>.
This is particularly useful with <code class="option">inline-signing</code>
zones that have been reset. Setting the serial number to a value
larger than that on the slaves will trigger an AXFR-style
transfer.
</p></li>
<li><p>
When answering recursive queries, SERVFAIL responses can now be
cached by the server for a limited time; subsequent queries for
the same query name and type will return another SERVFAIL until
the cache times out. This reduces the frequency of retries
when a query is persistently failing, which can be a burden
on recursive serviers. The SERVFAIL cache timeout is controlled
by <code class="option">servfail-ttl</code>, which defaults to 10 seconds
and has an upper limit of 30.
</p></li>
<li><p>
The new <span><strong class="command">rndc nta</strong></span> command can now be used to
set a "negative trust anchor" (NTA), disabling DNSSEC validation for
a specific domain; this can be used when responses from a domain
are known to be failing validation due to administrative error
rather than because of a spoofing attack. NTAs are strictly
temporary; by default they expire after one hour, but can be
configured to last up to one week. The default NTA lifetime
can be changed by setting the <code class="option">nta-lifetime</code> in
<code class="filename">named.conf</code>. When added, NTAs are stored in a
file (<code class="filename"><em class="replaceable"><code>viewname</code></em>.nta</code>)
in order to persist across restarts of the <span><strong class="command">named</strong></span> server.
</p></li>
<li><p>
The EDNS Client Subnet (ECS) option is now supported for
authoritative servers; if a query contains an ECS option then
ACLs containing <code class="option">geoip</code> or <code class="option">ecs</code>
elements can match against the the address encoded in the option.
This can be used to select a view for a query, so that different
answers can be provided depending on the client network.
</p></li>
<li><p>
The EDNS EXPIRE option has been implemented on the client
side, allowing a slave server to set the expiration timer
correctly when transferring zone data from another slave
server.
</p></li>
<li><p>
A new <code class="option">masterfile-style</code> zone option controls
the formatting of text zone files: When set to
<code class="literal">full</code>, the zone file will dumped in
single-line-per-record format.
</p></li>
<li><p>
<span><strong class="command">dig +ednsopt</strong></span> can now be used to set
arbitrary EDNS options in DNS requests.
</p></li>
<li><p>
<span><strong class="command">dig +ednsflags</strong></span> can now be used to set
yet-to-be-defined EDNS flags in DNS requests.
</p></li>
<li><p>
<span><strong class="command">dig +[no]ednsnegotiation</strong></span> can now be used enable /
disable EDNS version negotiation.
</p></li>
<li><p>
<span><strong class="command">dig +header-only</strong></span> can now be used to send
queries without a question section.
</p></li>
<li><p>
<span><strong class="command">dig +ttlunits</strong></span> causes <span><strong class="command">dig</strong></span>
to print TTL values with time-unit suffixes: w, d, h, m, s for
weeks, days, hours, minutes, and seconds.
</p></li>
<li><p>
<span><strong class="command">dig +zflag</strong></span> can be used to set the last
unassigned DNS header flag bit. This bit in normally zero.
</p></li>
<li><p>
<span><strong class="command">dig +dscp=<em class="replaceable"><code>value</code></em></strong></span>
can now be used to set the DSCP code point in outgoing query
packets.
</p></li>
<li><p>
<code class="option">serial-update-method</code> can now be set to
<code class="literal">date</code>. On update, the serial number will
be set to the current date in YYYYMMDDNN format.
</p></li>
<li><p>
<span><strong class="command">dnssec-signzone -N date</strong></span> also sets the serial
number to YYYYMMDDNN.
</p></li>
<li><p>
<span><strong class="command">named -L <em class="replaceable"><code>filename</code></em></strong></span>
causes <span><strong class="command">named</strong></span> to send log messages to the specified file by
default instead of to the system log.
</p></li>
<li><p>
The rate limiter configured by the
<code class="option">serial-query-rate</code> option no longer covers
NOTIFY messages; those are now separately controlled by
<code class="option">notify-rate</code> and
<code class="option">startup-notify-rate</code> (the latter of which
controls the rate of NOTIFY messages sent when the server
is first started up or reconfigured).
</p></li>
<li><p>
The default number of tasks and client objects available
for serving lightweight resolver queries have been increased,
and are now configurable via the new <code class="option">lwres-tasks</code>
and <code class="option">lwres-clients</code> options in
<code class="filename">named.conf</code>. [RT #35857]
</p></li>
<li><p>
Log output to files can now be buffered by specifying
<span><strong class="command">buffered yes;</strong></span> when creating a channel.
</p></li>
<li><p>
<span><strong class="command">delv +tcp</strong></span> will exclusively use TCP when
sending queries.
</p></li>
<li><p>
<span><strong class="command">named</strong></span> will now check to see whether
other name server processes are running before starting up.
This is implemented in two ways: 1) by refusing to start
if the configured network interfaces all return "address
in use", and 2) by attempting to acquire a lock on a file
specified by the <code class="option">lock-file</code> option or
the <span><strong class="command">-X</strong></span> command line option. The
default lock file is
<code class="filename">/var/run/named/named.lock</code>.
Specifying <code class="literal">none</code> will disable the lock
file check.
</p></li>
<li><p>
<span><strong class="command">rndc delzone</strong></span> can now be applied to zones
which were configured in <code class="filename">named.conf</code>;
it is no longer restricted to zones which were added by
<span><strong class="command">rndc addzone</strong></span>. (Note, however, that
this does not edit <code class="filename">named.conf</code>; the zone
must be removed from the configuration or it will return
when <span><strong class="command">named</strong></span> is restarted or reloaded.)
</p></li>
<li><p>
<span><strong class="command">rndc modzone</strong></span> can be used to reconfigure
a zone, using similar syntax to <span><strong class="command">rndc addzone</strong></span>.
</p></li>
<li><p>
<span><strong class="command">rndc showzone</strong></span> displays the current
configuration for a specified zone.
</p></li>
<li>
<p>
Added server-side support for pipelined TCP queries. Clients
may continue sending queries via TCP while previous queries are
processed in parallel. Responses are sent when they are
ready, not necessarily in the order in which the queries were
received.
</p>
<p>
To revert to the former behavior for a particular
client address or range of addresses, specify the address prefix
in the "keep-response-order" option. To revert to the former
behavior for all clients, use "keep-response-order { any; };".
</p>
</li>
<li><p>
The new <span><strong class="command">mdig</strong></span> command is a version of
<span><strong class="command">dig</strong></span> that sends multiple pipelined
queries and then waits for responses, instead of sending one
query and waiting the response before sending the next. [RT #38261]
</p></li>
<li><p>
To enable better monitoring and troubleshooting of RFC 5011
trust anchor management, the new <span><strong class="command">rndc managed-keys</strong></span>
can be used to check status of trust anchors or to force keys
to be refreshed. Also, the managed-keys data file now has
easier-to-read comments. [RT #38458]
</p></li>
<li><p>
An <span><strong class="command">--enable-querytrace</strong></span> configure switch is
now available to enable very verbose query tracelogging. This
option can only be set at compile time. This option has a
negative performance impact and should be used only for
debugging. [RT #37520]
</p></li>
<li><p>
A new <span><strong class="command">tcp-only</strong></span> option can be specified
in <span><strong class="command">server</strong></span> statements to force
<span><strong class="command">named</strong></span> to connect to the specified
server via TCP. [RT #37800]
</p></li>
<li><p>
The <span><strong class="command">nxdomain-redirect</strong></span> option specifies
a DNS namespace to use for NXDOMAIN redirection. When a
recursive lookup returns NXDOMAIN, a second lookup is
initiated with the specified name appended to the query
name. This allows NXDOMAIN redirection data to be supplied
by multiple zones configured on the server or by recursive
queries to other servers. (The older method, using
a single <span><strong class="command">type redirect</strong></span> zone, has
better average performance but is less flexible.) [RT #37989]
</p></li>
</ul></div>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_changes"></a>Feature Changes</h3></div></div></div>
<div class="itemizedlist"><ul type="disc">
<li><p>
ACLs containing <span><strong class="command">geoip asnum</strong></span> elements were
not correctly matched unless the full organization name was
specified in the ACL (as in
<span><strong class="command">geoip asnum "AS1234 Example, Inc.";</strong></span>).
They can now match against the AS number alone (as in
<span><strong class="command">geoip asnum "AS1234";</strong></span>).
</p></li>
<li><p>
When using native PKCS#11 cryptography (i.e.,
<span><strong class="command">configure --enable-native-pkcs11</strong></span>) HSM PINs
of up to 256 characters can now be used.
</p></li>
<li><p>
NXDOMAIN responses to queries of type DS are now cached separately
from those for other types. This helps when using "grafted" zones
of type forward, for which the parent zone does not contain a
delegation, such as local top-level domains. Previously a query
of type DS for such a zone could cause the zone apex to be cached
as NXDOMAIN, blocking all subsequent queries. (Note: This
change is only helpful when DNSSEC validation is not enabled.
"Grafted" zones without a delegation in the parent are not a
recommended configuration.)
</p></li>
<li><p>
Update forwarding performance has been improved by allowing
a single TCP connection to be shared between multiple updates.
</p></li>
<li><p>
By default, <span><strong class="command">nsupdate</strong></span> will now check
the correctness of hostnames when adding records of type
A, AAAA, MX, SOA, NS, SRV or PTR. This behavior can be
disabled with <span><strong class="command">check-names no</strong></span>.
</p></li>
<li><p>
Added support for OPENPGPKEY type.
</p></li>
<li><p>
The names of the files used to store managed keys and added
zones for each view are no longer based on the SHA256 hash
of the view name, except when this is necessary because the
view name contains characters that would be incompatible with use
as a file name. For views whose names do not contain forward
slashes ('/'), backslashes ('\'), or capital letters - which
could potentially cause namespace collision problems on
case-insensitive filesystems - files will now be named
after the view (for example, <code class="filename">internal.mkeys</code>
or <code class="filename">external.nzf</code>). However, to ensure
consistent behavior when upgrading, if a file using the old
name format is found to exist, it will continue to be used.
</p></li>
<li><p>
"rndc" can now return text output of arbitrary size to
the caller. (Prior to this, certain commands such as
"rndc tsig-list" and "rndc zonestatus" could return
truncated output.)
</p></li>
<li><p>
Errors reported when running <span><strong class="command">rndc addzone</strong></span>
(e.g., when a zone file cannot be loaded) have been clarified
to make it easier to diagnose problems.
</p></li>
<li><p>
When encountering an authoritative name server whose name is
an alias pointing to another name, the resolver treats
this as an error and skips to the next server. Previously
this happened silently; now the error will be logged to
the newly-created "cname" log category.
</p></li>
<li><p>
If <span><strong class="command">named</strong></span> is not configured to validate the answer then
allow fallback to plain DNS on timeout even when we know
the server supports EDNS. This will allow the server to
potentially resolve signed queries when TCP is being
blocked.
</p></li>
<li><p>
Large inline-signing changes should be less disruptive.
Signature generation is now done incrementally; the number
of signatures to be generated in each quantum is controlled
by "sig-signing-signatures <em class="replaceable"><code>number</code></em>;".
[RT #37927]
</p></li>
<li>
<p>
The experimental SIT option (code point 65001) of BIND
9.10.0 through BIND 9.10.2 has be replace the COOKIE
option (code point 10) and is no longer experimental and
is sent by default.
</p>
<p>
The SIT related named.conf options have been marked as
obsolete and are otherwise ignored.
</p>
</li>
<li><p>
When retrying a query via TCP due to the first answer
being truncated, <span><strong class="command">dig</strong></span> will now correctly
send the Server COOKIE returned by the server in the prior
response. [RT #39047]
</p></li>
<li><p>
A alternative NXDOMAIN redirect method (nxdomain-redirect)
which allows the redirect information to be looked up from
a namespace on the Internet rather than requiring a zone
to be configured on the server is now available.
</p></li>
<li><p>
Retrieving the local port range from net.ipv4.ip_local_port_range
on Linux is now supported.
</p></li>
<li><p>
Within the <code class="option">response-policy</code> option, it is now
possible to configure RPZ rewrite logging on a per-zone basis
using the <code class="option">log</code> clause.
</p></li>
</ul></div>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_bugs"></a>Bug Fixes</h3></div></div></div>
<div class="itemizedlist"><ul type="disc">
<li><p>
<span><strong class="command">dig</strong></span>, <span><strong class="command">host</strong></span> and
<span><strong class="command">nslookup</strong></span> aborted when encountering
a name which, after appending search list elements,
exceeded 255 bytes. Such names are now skipped, but
processing of other names will continue. [RT #36892]
</p></li>
<li><p>
The error message generated when
<span><strong class="command">named-checkzone</strong></span> or
<span><strong class="command">named-checkconf -z</strong></span> encounters a
<code class="option">$TTL</code> directive without a value has
been clarified. [RT #37138]
</p></li>
<li><p>
Semicolon characters (;) included in TXT records were
incorrectly escaped with a backslash when the record was
displayed as text. This is actually only necessary when there
are no quotation marks. [RT #37159]
</p></li>
<li><p>
When files opened for writing by <span><strong class="command">named</strong></span>,
such as zone journal files, were referenced more than once
in <code class="filename">named.conf</code>, it could lead to file
corruption as multiple threads wrote to the same file. This
is now detected when loading <code class="filename">named.conf</code>
and reported as an error. [RT #37172]
</p></li>
<li><p>
When checking for updates to trust anchors listed in
<code class="option">managed-keys</code>, <span><strong class="command">named</strong></span>
now revalidates keys based on the current set of
active trust anchors, without relying on any cached
record of previous validation. [RT #37506]
</p></li>
<li><p>
Large-system tuning
(<span><strong class="command">configure --with-tuning=large</strong></span>) caused
problems on some platforms by setting a socket receive
buffer size that was too large. This is now detected and
corrected at run time. [RT #37187]
</p></li>
<li><p>
When NXDOMAIN redirection is in use, queries for a name
that is present in the redirection zone but a type that
is not present will now return NOERROR instead of NXDOMAIN.
</p></li>
<li><p>
Due to an inadvertent removal of code in the previous
release, when <span><strong class="command">named</strong></span> encountered an
authoritative name server which dropped all EDNS queries,
it did not always try plain DNS. This has been corrected.
[RT #37965]
</p></li>
<li><p>
A regression caused nsupdate to use the default recursive servers
rather than the SOA MNAME server when sending the UPDATE.
</p></li>
<li><p>
Adjusted max-recursion-queries to accommodate the smaller
initial packet sizes used in BIND 9.10 and higher when
contacting authoritative servers for the first time.
</p></li>
<li><p>
Built-in "empty" zones did not correctly inherit the
"allow-transfer" ACL from the options or view. [RT #38310]
</p></li>
<li><p>
Two leaks were fixed that could cause <span><strong class="command">named</strong></span>
processes to grow to very large sizes. [RT #38454]
</p></li>
<li><p>
Fixed some bugs in RFC 5011 trust anchor management,
including a memory leak and a possible loss of state
information. [RT #38458]
</p></li>
<li><p>
Asynchronous zone loads were not handled correctly when the
zone load was already in progress; this could trigger a crash
in zt.c. [RT #37573]
</p></li>
<li><p>
A race during shutdown or reconfiguration could
cause an assertion failure in mem.c. [RT #38979]
</p></li>
<li><p>
Some answer formatting options didn't work correctly with
<span><strong class="command">dig +short</strong></span>. [RT #39291]
</p></li>
<li>
<p>
Several bugs have been fixed in the RPZ implementation:
</p>
<div class="itemizedlist"><ul type="circle">
<li><p>
Policy zones that did not specifically require recursion
could be treated as if they did; consequently, setting
<span><strong class="command">qname-wait-recurse no;</strong></span> was
sometimes ineffective. This has been corrected.
In most configurations, behavioral changes due to this
fix will not be noticeable. [RT #39229]
</p></li>
<li><p>
The server could crash if policy zones were updated (e.g.
via <span><strong class="command">rndc reload</strong></span> or an incoming zone
transfer) while RPZ processing was still ongoing for an
active query. [RT #39415]
</p></li>
<li><p>
On servers with one or more policy zones configured as
slaves, if a policy zone updated during regular operation
(rather than at startup) using a full zone reload, such as
via AXFR, a bug could allow the RPZ summary data to fall out
of sync, potentially leading to an assertion failure in
rpz.c when further incremental updates were made to the
zone, such as via IXFR. [RT #39567]
</p></li>
<li><p>
The server could match a shorter prefix than what was
available in CLIENT-IP policy triggers, and so, an
unexpected action could be taken. This has been
corrected. [RT #39481]
</p></li>
<li><p>
The server could crash if a reload of an RPZ zone was
initiated while another reload of the same zone was
already in progress. [RT #39649]
</p></li>
</ul></div>
</li>
</ul></div>
</div>
<div class="sect2" lang="en">
<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 href="https://www.isc.org/downloads/software-support-policy/" target="_top">https://www.isc.org/downloads/software-support-policy/</a>
</p>
</div>
<div class="sect2" lang="en">
<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 href="http://www.isc.org/donate/" target="_top">http://www.isc.org/donate/</a>.
</p>
</div>
</div></div></body>
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