BIND 9.9.8-S6 Release Notes
| Author: ISC Support Reference Number: AA-01361 Views: 1213 Created: 2016-03-09 18:40 Last Updated: 2016-03-09 19:31
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This document summarizes changes since the last production
release of BIND on the corresponding major release branch.
BIND 9.9.8-S6 addresses the security issues described in
CVE-2016-1285 and CVE-2016-1286.
BIND 9.9.8-S5 adds support for "dnstap" a fast and flexible
method of capturing and logging DNS traffic. Improved performance
of dual-stack systems by increasing the priority of IPv6
authoritative servers when selecting a server to query, and
using servers matching the address family used for the query
when possible. BIND 9.9.8-S5 also addresses the issues
described in CVE-2016-1284.
BIND 9.9.8-S4 addresses the security issue described in
CVE-2015-8704. It also fixes a serious regression in
authoritative server selection that was introduced in 9.9.8.
BIND 9.9.8-S3 addresses the security issues described in
CVE-2015-3193 (OpenSSL), CVE-2015-8000 and CVE-2015-8461.
BIND 9.9.8-S2 addresses the security issues described in
BIND 9.9.8-S1 adds a additional NXDOMAIN redirect method
("nxdomain-redirect"), updates "fetches-per-server" and
"fetches-per-zone" and deprecates "client-drop-policy".
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
The resolver could abort with an assertion failure due to
improper DNAME handling when parsing fetch reply
messages. This flaw is disclosed in CVE-2016-1286. [RT #41753]
Malformed control messages can trigger assertions in named
and rndc. This flaw is disclosed in CVE-2016-1285. [RT
A flag could be set in the wrong field when setting up
nonrecursive queries; this could cause the SERVFAIL cache to
cache responses it shouldn't, and in some circumstances
lead to an assertion failure. New querytrace logging has been
added which identified this error. Because of the possibility
of an assertion with some configurations, this flaw has been
disclosed in CVE-2016-1284. [RT #41155]
Specific APL data could trigger an INSIST. This flaw
is disclosed in CVE-2015-8704. [RT #41396]
Named is potentially vulnerable to the OpenSSL vulnerability
described in CVE-2015-3193.
Incorrect reference counting could result in an INSIST
failure if a socket error occurred while performing a
lookup. This flaw is disclosed in CVE-2015-8461. [RT#40945]
Insufficient testing when parsing a message allowed
records with an incorrect class to be be accepted,
triggering a REQUIRE failure when those records
were subsequently cached. This flaw is disclosed
in CVE-2015-8000. [RT #40987]
An incorrect boundary check in the OPENPGPKEY rdatatype
could trigger an assertion failure. This flaw is disclosed
in CVE-2015-5986. [RT #40286]
A buffer accounting error could trigger an assertion failure
when parsing certain malformed DNSSEC keys.
This flaw was discovered by Hanno Böck of the Fuzzing
Project, and is disclosed in CVE-2015-5722. [RT #40212]
A specially crafted query could trigger an assertion failure
This flaw was discovered by Jonathan Foote, and is disclosed
in CVE-2015-5477. [RT #40046]
On servers configured to perform DNSSEC validation, an
assertion failure could be triggered on answers from
a specially configured server.
This flaw was discovered by Breno Silveira Soares, and is
disclosed in CVE-2015-4620. [RT #39795]
Added support for dnstap, a fast,
flexible method for capturing and logging DNS traffic,
developed by Robert Edmonds at Farsight Security, Inc.,
whose assistance is gratefully acknowledged.
To enable dnstap at compile time,
the fstrm and protobuf-c
libraries must be available, and BIND must be configured with
A new utility dnstap-read has been added
to allow dnstap data to be presented in
a human-readable format.
For more information on dnstap, see
fetches-per-zone options have been
updated to take an additional argument,
fail, indicating whether queries
that exceed the quota should be dropped or answered with
has been deprecated.
Statistics counters have been added to track the number
of queries spilled due to the
An --enable-querytrace 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
The nxdomain-redirect 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 type redirect zone, has
better average performance but is less flexible.) [RT #37989]
EDNS COOKIE options content is now displayed as
Updated the compiled in addresses for H.ROOT-SERVERS.NET.
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
Retrieving the local port range from net.ipv4.ip_local_port_range
on Linux is now supported.
Active Directory names of the form gc._msdcs.<forest> are
now accepted as valid hostnames when using the
check-names option. <forest> is still
restricted to letters, digits and hyphens.
Names containing rich text are now accepted as valid
hostnames in PTR records in DNS-SD reverse lookup zones,
as specified in RFC 6763. [RT #37889]
The default preferred glue is now the address type of the
transport the query was received over.
Negative trust anchors (NTAs) were incorrectly deleted
when the server was reloaded or reconfigured. [RT #41058]
Authoritative servers that were marked as bogus (e.g. blackholed
in configuration or with invalid addresses) were being queried
anyway. [RT #41321]
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]
A race during shutdown or reconfiguration could
cause an assertion failure in mem.c. [RT #38979]
Some answer formatting options didn't work correctly with
dig +short. [RT #39291]
Malformed records of some types, including NSAP and UNSPEC,
could trigger assertion failures when loading text zone files.
[RT #40274] [RT #40285]
Fixed a possible crash in ratelimiter.c caused by NOTIFY
messages being removed from the wrong rate limiter queue.
was inconsistently applied. [RT #40456]
BADVERS responses from broken authoritative name servers were
not handled correctly. [RT #40427]
Several bugs have been fixed in the RPZ implementation:
Policy zones that did not specifically require recursion
could be treated as if they did; consequently, setting
qname-wait-recurse no; was
sometimes ineffective. This has been corrected.
In most configurations, behavioral changes due to this
fix will not be noticeable. [RT #39229]
The server could crash if policy zones were updated (e.g.
via rndc reload or an incoming zone
transfer) while RPZ processing was still ongoing for an
active query. [RT #39415]
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]
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]
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]
Query names could match against the wrong policy zone
if wildcard records were present. [RT #40357]
BIND 9.9 (Extended Support Version) will be supported until
December, 2017. BIND 9.9-S (Supported Preview Edition) releases
will continue to be published in tandem with BIND 9.9 releases
until the Supported Preview Edition moves to new branch, which
may happen before BIND 9.9 reaches end of life, but not later. See
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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