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BIND 9.10.1-P2 Release Notes
Author: Cathy Almond Reference Number: AA-01244 Views: 2904 Created: 2015-02-18 21:00 Last Updated: 2015-02-18 21:47 0 Rating/ Voters
Introduction

BIND 9.10.1-P2 is a security fix release of BIND 9.10.

This document summarizes feature changes from BIND 9.10.0 to BIND 9.10.1-P2.  Entries marked with (**) indicate changes since 9.10.1-P1

Please see the CHANGES file in the source code release for a complete list of all changes, including bug fixes.

Security Fixes
  • On servers configured to perform DNSSEC validation using managed trust anchors (i.e., keys configured explicitly via managed-keys, or implicitly via dnssec-validation auto; or dnssec-lookaside auto;), revoking a trust anchor and sending a new untrusted replacement could cause named to crash with an assertion failure.  This could occur in the event of a botched key rollover, or potentially as a result of a deliberate attack if the attacker was in position to monitor the victim's DNS traffic.  This flaw was discovered by Jan-Piet Mens, and is disclosed in [CVE-2015-1349] [RT #38344] (**)
  • 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 9.9.6 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 EDNS0 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/.


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