BIND 9.8.4-P1 is now available

BIND 9.8.4-P1 is now available

Several security fixes, bugs and a feature. Note that 9.8.3 now isn’t a current version anymore:

9.9.2-P1 is also available if anyone is using the 9.9.x



BIND 9.8.4-P1 is a security-fix release, superceding BIND 9.8.4
as the latest production release of BIND 9.8.

This document summarizes changes from BIND 9.8.3 to BIND 9.8.4-P1.
Please see the CHANGES file in the source code release for a
complete list of all changes.


The latest versions of BIND 9 software can always be found on
our web site at There you will
find additional information about each release, source code, and
pre-compiled versions for Microsoft Windows operating systems.


Product support information is available on 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

Security Fixes

Prevents named from aborting with a require assertion failure
on servers with DNS64 enabled. These crashes might occur as a
result of specific queries that are received. (Note that this
fix is a subset of a series of updates that will be included in
full in BIND 9.8.5 and 9.9.3 as change #3388, RT #30996).
[CVE-2012-5688] [RT #30792]

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]

New Features

Elliptic Curve Digital Signature Algorithm keys and signatures
in DNSSEC are now supported per RFC 6605. [RT #21918]

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]

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]

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

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]

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]

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
– 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

(c) 2001-2012 Internet Systems Consortium

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