BIND 9.10.1-P1 is now available
Michael McNally
mcnally at isc.org
Mon Dec 8 17:15:34 UTC 2014
Introduction
BIND 9.10.1-P1 is a security fix release of BIND 9.10.
This document summarizes feature changes from BIND 9.10.0 to
BIND 9.10.1-P1. Entries marked with (**) indicate changes since
9.10.1
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] (**)
Two separate problems were identified in BIND's GeoIP code
that could lead to an assertion failure. One was triggered
by use of both IPv4 and IPv6 address families, the other by
referencing a GeoIP database in named.conf which was not
installed. ISC would like to thank Felipe Ecker for his
help discovering these vulnerabilities. For more information,
see the security advisory at https://kb.isc.org/article/AA-01217/.
[CVE-2014-8680] [RT #37672] [RT #37679] (**)
A less serious security flaw was also found in GeoIP: changes
to the geoip-directory option in named.conf may be incomplete
when running rndc reconfig, rndc reload, or sending SIGHUP
to named. In theory, this could allow named to allow access
to unintended clients or serve wrong data based on geolocation
configuration. [RT #37720] (**)
A query specially crafted to exploit a defect in EDNS option
processing could cause named to terminate with an assertion
failure, due to a missing isc_buffer_availablelength() check
when formatting packet contents for logging. For more
information, see the security advisory at
https://kb.isc.org/article/AA-01166/. [CVE-2014-3859] [RT
#36078]
A programming error in the prefetch feature could cause named
to crash with a "REQUIRE" assertion failure in name.c. For
more information, see the security advisory at
https://kb.isc.org/article/AA-01161/. [CVE-2014-3214] [RT
#35899]
Outstanding Issues
The following issues were discovered prior to the release of
BIND 9.10.1-P1 but were not considered important enough to stop
the release and will instead be addressed in BIND 9.10.2 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]
Optionally allows libseccomp-based (secure computing mode)
system-call filtering on Linux. This sandboxing mechanism
may be used to isolate "named" from various system resources.
Use "configure --enable-seccomp" at build time to enable it.
Thank you to Loganaden Velvindron of AFRINIC for the
contribution. [RT #35347]
Feature Changes
"geoip asnum" ACL elements would not match unless the full
organization name was specified. They can now match against
the AS number alone (e.g., AS1234). [RT #36945]
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]
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]
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]
An assertion failure could occur if a route event arrived
while shutting down. [RT #36887]
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]
On some platforms, overhead from DSCP tagging caused a
performance regression between BIND 9.9 and BIND 9.10. [RT
#36534]
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]
Fixed a bug where some updated policy zone contents could
be ignored due to stale RPZ summary information [RT #35885]
A race condition could cause a crash in isc_event_free during
shutdown. [RT #36720]
Addresses some problems with unrecoverable lookup failures.
[RT #36330]
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]
Disable the GCC 4.9 "delete null pointer check" optimizer
option, and refactor dns_rdataslab_fromrdataset() to separate
out the handling of an rdataset with no records. 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 GeoIP ACLs not to work when referenced
indirectly via named or nested ACLs. [RT #35879]
FIxed a bug that could cause problems with cache cleaning
when SIT was enabled. [RT #35858]
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]
Fixed a bug that could cause an assertion failure when
inserting and deleting parent and child nodes in a response-policy
zone. [RT #36272]
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 Consortium
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