Release Notes for BIND Version 9.9.11-P1
Introduction
This document summarizes changes since BIND 9.9.11.
BIND 9.9.11-P1 addresses the security issue described in CVE-2017-3145.
Download
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 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
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
https://www.isc.org/bind-keys .
Windows XP No Longer Supported
As of BIND 9.9.11, Windows XP is no longer a supported platform for
BIND, and Windows XP binaries are no longer available for download from
ISC.
Security Fixes
* 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. (The delay will be addressed in an
upcoming maintenance release.) This bug is disclosed in
CVE-2017-3145. [RT #46839]
* 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]
* 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]
* With certain RPZ configurations, a response with TTL 0 could cause
named to go into an infinite query loop. This flaw is disclosed in
CVE-2017-3140. [RT #45181]
Feature Changes
* Threads in named 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 ps
and top, but not the main thread. [RT #43234]
* DiG now warns about .local queries which are reserved for Multicast
DNS. [RT #44783]
Bug Fixes
* 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]
* 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]
* AD could be set on truncated answer with no records present in the
answer and authority sections. [RT #45140]
End of Life
BIND 9.9 (Extended Support Version) will be supported until at least
June, 2018. https://www.isc.org/downloads/software-support-policy/
0dbc45af90