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BIND 9.9.8-S4 Release Notes
Author: Michael McNally Reference Number: AA-01345 Views: 2454 Created: 2016-01-19 19:36 Last Updated: 2016-01-19 19:36 0 Rating/ Voters

Introduction

BIND 9 Supported Preview edition is a feature preview version of BIND provided exclusively to eligible ISC Support customers.

This document summarizes changes since the last production release of BIND on the corresponding major release branch.

Download

The latest versions of BIND 9 software can always be found 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.

Security Fixes

  • Named is potentially vulnerable to the OpenSSL vulnerabilty described in CVE-2015-3193.

  • Incorrect reference counting could result in an INSIST failure if a socket error occurred while performing a lookup. This flaw is disclosed in CVE-2015-8461. [RT#40945]

  • Insufficient testing when parsing a message allowed records with an incorrect class to be be accepted, triggering a REQUIRE failure when those records were subsequently cached. This flaw is disclosed in CVE-2015-8000. [RT #40987]

  • An incorrect boundary check in the OPENPGPKEY rdatatype could trigger an assertion failure. This flaw is disclosed in CVE-2015-5986. [RT #40286]

  • A buffer accounting error could trigger an assertion failure when parsing certain malformed DNSSEC keys.

    This flaw was discovered by Hanno Böck of the Fuzzing Project, and is disclosed in CVE-2015-5722. [RT #40212]

  • A specially crafted query could trigger an assertion failure in message.c.

    This flaw was discovered by Jonathan Foote, and is disclosed in CVE-2015-5477. [RT #40046]

  • On servers configured to perform DNSSEC validation, an assertion failure could be triggered on answers from a specially configured server.

    This flaw was discovered by Breno Silveira Soares, and is disclosed in CVE-2015-4620. [RT #39795]

  • Specific APL data could trigger an INSIST. This flaw was discovered by Brian Mitchell and is disclosed in CVE-2015-8704. [RT #41396]

New Features

  • The fetches-per-server and fetches-per-zone options have been updated to take an additional argument, drop or fail, indicating whether queries that exceed the quota should be dropped or answered with SERVFAIL.

  • The experimental client-drop-policy option has been deprecated.

  • Statistics counters have been added to track the number of queries spilled due to the fetches-per-server and fetches-per-zone quotas.

  • An --enable-querytrace configure switch is now available to enable very verbose query tracelogging. This option can only be set at compile time. This option has a negative performance impact and should be used only for debugging.

  • The nxdomain-redirect option specifies a DNS namespace to use for NXDOMAIN redirection. When a recursive lookup returns NXDOMAIN, a second lookup is initiated with the specified name appended to the query name. This allows NXDOMAIN redirection data to be supplied by multiple zones configured on the server or by recursive queries to other servers. (The older method, using a single type redirect zone, has better average performance but is less flexible.) [RT #37989]

  • EDNS COOKIE options content is now displayed as "COOKIE: <hexvalue>".

Feature Changes

  • Updated the compiled in addresses for H.ROOT-SERVERS.NET.

  • Large inline-signing changes should be less disruptive. Signature generation is now done incrementally; the number of signatures to be generated in each quantum is controlled by "sig-signing-signatures number;". [RT #37927]

  • Retrieving the local port range from net.ipv4.ip_local_port_range on Linux is now supported.

  • Active Directory names of the form gc._msdcs.<forest> are now accepted as valid hostnames when using the check-names option. <forest> is still restricted to letters, digits and hyphens.

  • Names containing rich text are now accepted as valid hostnames in PTR records in DNS-SD reverse lookup zones, as specified in RFC 6763. [RT #37889]

Bug Fixes

  • Authoritative servers that were marked as bogus (e.g. blackholed in configuration or with invalid addresses) were being queried anyway. [RT #41321]

  • Asynchronous zone loads were not handled correctly when the zone load was already in progress; this could trigger a crash in zt.c. [RT #37573]

  • A race during shutdown or reconfiguration could cause an assertion failure in mem.c. [RT #38979]

  • Some answer formatting options didn't work correctly with dig +short. [RT #39291]

  • Malformed records of some types, including NSAP and UNSPEC, could trigger assertion failures when loading text zone files. [RT #40274] [RT #40285]

  • Fixed a possible crash in ratelimiter.c caused by NOTIFY messages being removed from the wrong rate limiter queue. [RT #40350]

  • The default rrset-order of random was inconsistently applied. [RT #40456]

  • BADVERS responses from broken authoritative name servers were not handled correctly. [RT #40427]

  • Several bugs have been fixed in the RPZ implementation:

    • Policy zones that did not specifically require recursion could be treated as if they did; consequently, setting qname-wait-recurse no; was sometimes ineffective. This has been corrected. In most configurations, behavioral changes due to this fix will not be noticeable. [RT #39229]

    • The server could crash if policy zones were updated (e.g. via rndc reload or an incoming zone transfer) while RPZ processing was still ongoing for an active query. [RT #39415]

    • On servers with one or more policy zones configured as slaves, if a policy zone updated during regular operation (rather than at startup) using a full zone reload, such as via AXFR, a bug could allow the RPZ summary data to fall out of sync, potentially leading to an assertion failure in rpz.c when further incremental updates were made to the zone, such as via IXFR. [RT #39567]

    • The server could match a shorter prefix than what was available in CLIENT-IP policy triggers, and so, an unexpected action could be taken. This has been corrected. [RT #39481]

    • The server could crash if a reload of an RPZ zone was initiated while another reload of the same zone was already in progress. [RT #39649]

    • Query names could match against the wrong policy zone if wildcard records were present. [RT #40357]

End of Life

The BIND 9.9 (Extended Support Version) will be supported until June, 2017. https://www.isc.org/downloads/software-support-policy/

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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