BIND 9.9.6-P1 is now available
Michael McNally
mcnally at isc.org
Mon Dec 8 17:15:34 UTC 2014
Introduction
BIND 9.9.6-P1 is is a security fix release of BIND 9.9, an
Extended Support Version (ESV) of BIND 9.
This document summarizes the feature changes from BIND 9.9.5 to
BIND 9.9.6-P1. Entries marked with (**) indicate changes since
9.9.6.
Please see the CHANGES file in the source code release for a
complete list of all changes, including bug fixes.
Security Fixes
A flaw in delegation handling could be exploited to put named
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 named will allow (default 7), and on the number of
queries that it will send before terminating a recursive query
(default 50). The recursion depth limit is configured via the
max-recursion-depth option, and the query limit via the
max-recursion-queries option. The flaw was discovered by Florian
Maury of ANSSI. For more information, see the security advisory
at https://kb.isc.org/article/AA-01216/. [CVE-2014-8500] [RT
#37580] (**)
Outstanding Issues
The following issues were discovered prior to the release of
BIND 9.9.6-P1 but were not considered important enough to stop
the release and will instead be addressed in BIND 9.9.7 and
future versions. Workarounds and/or patches are available:
A minor bugfix added to BIND 9.9.6, 9.8.8 and 9.10.0 introduced
a regression that causes the nsupdate(8) utility to fail to
resolve (and thus fail to send updates to) the SOA MNAME host
in some cases. For more details see
https://kb.isc.org/article/AA-01220.
Refinements to EDNS fallback behavior in BIND 9.6.6 and 9.10.1
may prevent named (running as a recursive server) from
attempting a final query using UDP without EDNS0 in some rare
situations where prior queries using EDSN0 with both and TCP
did not obtain usable answers. For more details see
https://kb.isc.org/article/AA-01219/.
New Features
Support for CAA record types, as described in RFC 6844 "DNS
Certification Authority Authorization (CAA) Resource Record",
was added. [RT#36625] [RT #36737]
Disallow "request-ixfr" from being specified in zone statements
where it is not valid (it is only valid for slave and redirect
zones) [RT #36608]
Support for CDS and CDNSKEY resource record types was added. For
details see the proposed Informational Internet-Draft "Automating
DNSSEC Delegation Trust Maintenance" at
http://tools.ietf.org/html/draft-ietf-dnsop-delegation-trust-maintainance-14.
[RT #36333]
Added version printing options to various BIND utilities. [RT
#26057] [RT #10686]
On Windows, enable the Python tools "dnssec-coverage" and
"dnssec-checkds". [RT #34355]
Added a "no-case-compress" ACL, which causes named to use
case-insensitive compression (disabling change #3645) for specified
clients. (This is useful when dealing with broken client
implementations that use case-sensitive name comparisons, rejecting
responses that fail to match the capitalization of the query
that was sent.) [RT #35300]
Feature Changes
Adds RPZ SOA to the additional section of responses to clearly
indicate the use of RPZ in a manner that is intended to avoid
causing issues for downstream resolvers and forwarders [RT #36507]
rndc now gives distinct error messages when an unqualified zone
name matches multiple views vs. matching no views [RT #36691]
Improves the accuracy of dig's reported round trip times. [RT
#36611]
The Windows installer now places files in the Program Files area
rather than system services. [RT #35361]
When an SPF record exists in a zone but no equivalent TXT record
does, a warning will be issued. The warning for the reverse
condition is no longer issued. See the check-spf option in the
documentation for details. [RT #36210]
"named" will now log explicitly when using rndc.key to configure
command channel. [RT #35316]
The default setting for the -U option (setting the number of UDP
listeners per interface) has been adjusted to improve performance.
[RT #35417]
Aging of smoothed round-trip time measurements is now limited
to no more than once per second, to improve accuracy in selecting
the best name server. [RT #32909]
DNSSEC keys that have been marked active but have no publication
date are no longer presumed to be publishable. [RT #35063]
Bug Fixes
the Makefile in bin/python was changed to work around a bmake
bug in FreeBSD 10 and NetBSD 6. [RT #36993]
Corrected bugs in the handling of wildcard records by the DNSSEC
validator: invalid wildcard expansions could be treated as valid
if signed, and valid wildcard expansions in NSEC3 opt-out ranges
had the AD bit set incorrectly in responses. [RT #37093] [RT
#37072]
When resigning, dnssec-signzone was removing all signatures from
delegation nodes. It now retains DS and (if applicable) NSEC
signatures. [RT #36946]
The AD flag was being set inappopriately on RPZ responses. [RT
#36833]
Updates the URI record type to current draft standard,
draft-faltstrom-uri-08, and allows the value field to be zero
length [RT #36642] [RT #36737]
RRSIG sets that were not loaded in a single transaction at start
up were not being correctly added to re-signing heaps. [RT
#36302]
Setting '-t aaaa' in .digrc had unintended side-effects. [RT
#36452]
A race condition could cause a crash in isc_event_free during
shutdown. [RT #36720]
Addresses a race condition issue in dispatch. [RT #36731]
acl elements could be miscounted, causing a crash while loading
a config [RT #36675]
Corrects a deadlock between view.c and adb.c. [RT #36341]
liblwres wasn't properly handling link-local addresses in
nameserver clauses in resolv.conf. [RT #36039]
Buffers in isc_print_vsnprintf were not properly initialized
leading to potential overflows when printing out quad values.
[RT #36505]
Don't call qsort() with a null pointer, and disable the GCC 4.9
"delete null pointer check" optimizer option. This fixes problems
when using GNU GCC 4.9.0 where its compiler code optimizations
may cause crashes in BIND. For more information, see the operational
advisory at https://kb.isc.org/article/AA-01167/. [RT #35968]
Fixed a bug that could cause repeated resigning of records in
dynamically signed zones. [RT #35273]
Fixed a bug that could cause an assertion failure after forwarding
was disabled. [RT #35979]
Fixed a bug that caused SERVFAILs when using RPZ on a system
configured as a forwarder. [RT #36060]
Worked around a limitation in Solaris's /dev/poll implementation
that could cause named to fail to start when configured to use
more sockets than the system could accomodate. [RT #35878]
Download
The latest versions of BIND 9 software can always be found on
our web site 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.
Support
Professional support is provided by Internet Systems Consortium,
Inc., doing business as DNSco. Information about paid support
options is available at http://www.dns-co.com/solutions/. Free
support is provided by our user community via a mailing list.
Information on all public email lists is available at
https://www.isc.org/community/mailing-list/.
Thank You
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 http://www.isc.org/donate/.
(c) 2001-2014 Internet Systems Consortiu
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