BIND 9.11.0-P5 is now available
mcnally at isc.org
Thu Apr 13 00:07:51 UTC 2017
This document summarizes changes since BIND 9.11.0:
BIND 9.11.0-P5 addresses the security issues described in
CVE-2017-3136, CVE-2017-3137, and CVE-2017-3138, and updates the
built-in trusted keys for the root zone.
BIND 9.11.0-P4 was withdrawn prior to publication.
BIND 9.11.0-P3 addresses the security issue described in CVE-2017-3135,
and fixes a regression introduced in a prior security release.
BIND 9.11.0-P2 addresses the security issues described in
CVE-2016-9131, CVE-2016-9147, CVE-2016-9444 and CVE-2016-9778.
BIND 9.11.0-P1 addresses the security issue described in CVE-2016-8864.
The latest versions of BIND 9 software can always be found at
http://www.isc.org/downloads/. There you will find additional
information about each release, source code, and pre-compiled versions
for Microsoft Windows operating systems.
New DNSSEC Root Key
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
* rndc "" could trigger an assertion failure in named. This flaw is
disclosed in (CVE-2017-3138). [RT #44924]
* Some chaining (i.e., type CNAME or DNAME) responses to upstream
queries could trigger assertion failures. This flaw is disclosed in
CVE-2017-3137. [RT #44734]
* dns64 with break-dnssec yes; can result in an assertion failure.
This flaw is disclosed in CVE-2017-3136. [RT #44653]
* 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 nxdomain-redirect 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. [RT #43522]
* It was possible to trigger assertions when processing responses
containing answers of type DNAME. This flaw is disclosed in
CVE-2016-8864. [RT #43465]
* 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.
End of Life
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.
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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