BIND 9.9.2b1 is now available

Michael McNally mcnally at
Fri Aug 10 19:41:27 UTC 2012


  BIND 9.9.2b1 is the first beta release of BIND 9.9.2.

  This document summarizes changes from BIND 9.9.1 to BIND 9.9.2b1.
  Please see the CHANGES file in the source code release for a
  complete list of all changes.  Download

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Security Fixes

  - 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

  - 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

  - 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.
      + 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

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

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