BIND 9.9.2 is now available
Michael McNally
mcnally at isc.org
Tue Oct 9 21:15:50 UTC 2012
Introduction
BIND 9.9.2 is the latest production release of BIND 9.9.
This document summarizes changes from BIND 9.9.1 to BIND 9.9.2.
Please see the CHANGES file in the source code release for a
complete list of all changes.
Download
The latest versions of BIND 9 software can always be found on our
web site at http://www.isc.org/downloads/all. There you will find
additional information about each release, source code, and
pre-compiled versions for Microsoft Windows operating systems.
Support
Product support information is available on
http://www.isc.org/services/support for paid support options. Free
support is provided by our user community via a mailing list.
Information on all public email lists is available at
https://lists.isc.org/mailman/listinfo.
Security Fixes
* A deliberately constructed combination of records could cause named
to hang while populating the additional section of a response.
[CVE-2012-5166] [RT #31090]
* Prevents a named assert (crash) when queried for a record whose
RDATA exceeds 65535 bytes. [CVE-2012-4244] [RT #30416]
* Prevents a named assert (crash) when validating caused by using
"Bad cache" data before it has been initialized. [CVE-2012-3817]
[RT #30025]
* A condition has been corrected where improper handling of
zero-length RDATA could cause undesirable behavior, including
termination of the named process. [CVE-2012-1667] [RT #29644]
* ISC_QUEUE handling for recursive clients was updated to address a
race condition that could cause a memory leak. This rarely occurred
with UDP clients, but could be a significant problem for a server
handling a steady rate of TCP queries. [CVE-2012-3868] [RT #29539
& #30233]
New Features
* Elliptic Curve Digital Signature Algorithm keys and signatures in
DNSSEC are now supported per RFC 6605. [RT #21918]
* Introduces a new tool "dnssec-checkds" command that checks a zone
to determine which DS records should be published in the parent
zone, or which DLV records should be published in a DLV zone, and
queries the DNS to ensure that it exists. (Note: This tool depends
on python; it will not be built or installed on systems that do not
have a python interpreter.) [RT #28099]
* Introduces a new tool "dnssec-verify" that validates a signed zone,
checking for the correctness of signatures and NSEC/NSEC3 chains.
[RT #23673]
* Adds configuration option "max-rsa-exponent-size <value>;" that can
be used to specify the maximum rsa exponent size that will be
accepted when validating [RT #29228]
Feature Changes
* Improves OpenSSL error logging [RT #29932]
* nslookup now returns a nonzero exit code when it is unable to get
an answer. [RT #29492]
Bug Fixes
* Uses binary mode to open raw files on Windows. [RT #30944]
* When using DNSSEC inline signing with "rndc signing -nsec3param", a
salt value of "-" can now be used to indicate 'no salt'.
[RT #30099]
* Prevents race conditions (address use after free) that could be
encountered when named is shutting down and releasing structures
used to manage recursive clients. [RT #30241]
* Static-stub zones now accept "forward" and "fowarders" options
(often needed for subdomains of the zone referenced to override
global forwarding options). These options are already available
with traditional stub zones and their omission from zones of type
"static-stub" was an inadvertent oversight. [RT #30482]
* Limits the TTL of signed RRsets in cache when their RRSIGs are
approaching expiry. This prevents the persistence in cache of
invalid RRSIGs in order to assist recovery from a situation where
zone re-signing doesn't occur in a timely manner. With this
change, named will attempt to obtain new RRSIGs from the
authoritative server once the original ones have expired, and even
if the TTL of the old records would in other circumstances cause
them to be kept in cache for longer. [RT #26429]
* Corrects the syntax of isc_atomic_xadd() and isc_atomic_cmpxchg()
which are employed on Itanium systems to speed up lock management
by making use of atomic operations. Without the syntax correction
it is possible that concurrent access to the same structures could
accidentally occur with unpredictable results. [RT #25181]
* Improves OpenSSL error logging [RT #29932]
* The configure script now supports and detects libxml2-2.8.x
correctly [RT #30440]
* The host command should no longer assert on some architectures and
builds while handling the time values used with the -w (wait
forever) option. [RT #18723]
* Invalid zero settings for max-retry-time, min-retry-time,
max-refresh-time, min-refresh-time will now be detected during
parsing of named.conf and an error emitted instead of triggering an
assertion failure on startup. [RT #27730]
* Removes spurious newlines from log messages in zone.c [RT #30675]
* When built with readline support (i.e. on a system with readline
installed) nsupdate no longer terminates unexpectedly in
interactive mode. [RT #29550]
* All named tasks that perform task-exclusive operations now share
the same single task. Prior to this change, there was the
possibility of a race condition between rndc operations and other
functions such as re-sizing the adb hash table. If the race
condition was encountered, named would in most cases terminate
unexpectedly with an assert. [RT #29872]
* Ensures that servers are expired from the ADB cache when the
timeout limit is reached so that their learned attributes can be
refreshed. Prior to this change, servers that were frequently
queried might never have their entries removed and reinitialized.
This is of particular importance to DNSSEC-validating recursive
servers that might erroneously set "no-edns" for an authoritative
server following a period of intermittent connectivity. [RT #29856]
* Adds additional resilience to a previous security change (3218) by
preventing RRSIG data from being added to cache when a
pseudo-record matching the covering type and proving non-existence
exists at a higher trust level. The earlier change prevented this
inconsistent data from being retrieved from cache in response to
client queries - with this additional change, the RRSIG records
are no longer inserted into cache at all. [RT #26809]
* dnssec-settime will now issue a warning when the writing of a new
private key file would cause a change in the permissions of the
existing file. [RT #27724]
* Fixes the defect introduced by change #3314 that was causing
failures when saving stub zones to disk (resulting in excessive CPU
usage in some cases). [RT #29952]
* Address race condition in units tests: asyncload_zone and
asyncload_zt. [RT #26100]
* It is now possible to using multiple control keys again - this
functionality was inadvertently broken by change #3924 (RT #28265)
which addressed a memory leak. [RT #29694]
* Named now holds a zone table reference while performing an
asynchronous load of a zone. This removes a race condition that
could cause named to crash when zones are added using rndc addzone
or by manually editing named's configuration file followed by rndc
reconfig/reload. [RT #28326]
* Setting resolver-query-timeout too low could cause named problems
recovering after a loss of connectivity. [RT #29623]
* Reduces the potential build-up of stale RRsets in cache on a busy
recursive nameserver by re-using cached DS and RRSIG rrsets when
possible [RT #29446]
* Corrects a failure to authenticate non-existence of resource
records in some circumstances when RPZ has been configured. Also:
* adds an optional "recursive-only yes|no" to the response-policy
statement
* adds an optional "max-policy-ttl" to the response-policy
statement to limit the false data that "recursive-only no" can
introduce into resolvers' caches
* introduces a predefined encoding of PASSTHRU policy by adding
"rpz-passthru" to be used as the target of CNAME policy records
(the old encoding is still accepted.)
* adds a RPZ performance test to bin/tests/system/rpz when
queryperf is available.
[RT #26172]
* Upper-case/lower-case handling of RRSIG signer-names is now handled
consistently: RRSIG records are generated with the signer-name in
lower case. They are accepted with any case, but if they fail to
validate, we try again in lower case. [RT #27451]
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/supportisc.
(c) 2001-2012 Internet Systems Consortium
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