BIND 9.11.1rc1 Release Notes
| Author: Michael McNally Reference Number: AA-01459 Views: 4774 Created: 2017-02-08 21:02 Last Updated: 2017-02-08 22:46
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This document summarizes changes since the last production
release on the BIND 9.11 branch.
Please see the
CHANGES file for a further
list of bug fixes and other changes.
The latest versions of BIND 9 software can always be found at
There you will find additional information about each release,
source code, and pre-compiled versions for Microsoft Windows
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
will roll seamlessly to the new key when it is published in
the root zone. 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
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).
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.
This new requirement will not affect anyone who is using BIND
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.
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
If a server is configured with a response policy zone (RPZ)
that rewrites an answer with local data, and is also configured
for DNS64 address mapping, a NULL pointer can be read
triggering a server crash. This flaw is disclosed in
CVE-2017-3135. [RT #44434]
A coding error in the
feature could lead to an assertion failure if the redirection
namespace was served from a local authoritative data source
such as a local zone or a DLZ instead of via recursive
lookup. This flaw is disclosed in CVE-2016-9778. [RT #43837]
named could mishandle authority sections
with missing RRSIGs, triggering an assertion failure. This
flaw is disclosed in CVE-2016-9444. [RT #43632]
named mishandled some responses where
covering RRSIG records were returned without the requested
data, resulting in an assertion failure. This flaw is
disclosed in CVE-2016-9147. [RT #43548]
named incorrectly tried to cache TKEY
records which could trigger an assertion failure when there was
a class mismatch. This flaw is disclosed in CVE-2016-9131.
It was possible to trigger assertions when processing
responses containing answers of type DNAME. This flaw is
disclosed in CVE-2016-8864. [RT #43465]
Added the ability to specify the maximum number of records
permitted in a zone (
This provides a mechanism to block overly large zone
transfers, which is a potential risk with slave zones from
other parties, as described in CVE-2016-6170.
dnstap now stores both the local and remote
addresses for all messages, instead of only the remote address.
The default output format for dnstap-read has
been updated to include these addresses, with the initiating
address first and the responding address second, separated by
"-%gt;" or "%lt;-" to indicate in which direction the message
was sent. [RT #43595]
The built in mangaged keys for the global root zone have been
updated to include the upcoming key signing key (keyid 20326).
Expanded and improved the YAML output from
dnstap-read -y: it now includes packet
size and a detailed breakdown of message contents.
[RT #43622] [RT #43642]
If an ACL is specified with an address prefix in which the
prefix length is longer than the address portion (for example,
192.0.2.1/8), named will now log a warning.
In future releases this will be a fatal configuration error.
A synthesized CNAME record appearing in a response before the
associated DNAME could be cached, when it should not have been.
This was a regression introduced while addressing CVE-2016-8864.
Named could deadlock there were multiple changes to
NSEC/NSEC3 parameters for a zone being processed at the
same time. [RT #42770]
Named could trigger a assertion when sending notify
messages. [RT #44019]
Referencing a nonexistent zone in a response-policy
statement could cause an assertion failure during configuration.
rndc addzone could cause a crash
when attempting to add a zone with a type other than
master or slave.
Such zones are now rejected. [RT #43665]
named could hang when encountering log
file names with large apparent gaps in version number (for
example, when files exist called "logfile.0", "logfile.1",
and "logfile.1482954169"). This is now handled correctly.
If a zone was updated while named was
processing a query for nonexistent data, it could return
out-of-sync NSEC3 records causing potential DNSSEC validation
failure. [RT #43247]
Authoritative server support for the EDNS Client Subnet option
(ECS), introduced in BIND 9.11.0, was based on an early version
of the specification, and is now known to have incompatibilities
with other ECS implementations. It is also inefficient, requiring
a separate view for each answer, and is unable to correct for
overlapping subnets in the configuration. It is intended for
testing purposes but is not recommended for for production use.
This was not made sufficiently clear in the documentation at
the time of release.
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
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