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121 lines
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.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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..
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.. SPDX-License-Identifier: MPL-2.0
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..
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.. This Source Code Form is subject to the terms of the Mozilla Public
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.. License, v. 2.0. If a copy of the MPL was not distributed with this
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.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
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..
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.. See the COPYRIGHT file distributed with this work for additional
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.. information regarding copyright ownership.
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Notes for BIND 9.19.9
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---------------------
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Security Fixes
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~~~~~~~~~~~~~~
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- An UPDATE message flood could cause :iscman:`named` to exhaust all
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available memory. This flaw was addressed by adding a new
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:any:`update-quota` option that controls the maximum number of
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outstanding DNS UPDATE messages that :iscman:`named` can hold in a
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queue at any given time (default: 100). :cve:`2022-3094`
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ISC would like to thank Rob Schulhof from Infoblox for bringing this
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vulnerability to our attention. :gl:`#3523`
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- :iscman:`named` could crash with an assertion failure when an RRSIG
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query was received and :any:`stale-answer-client-timeout` was set to a
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non-zero value. This has been fixed. :cve:`2022-3736`
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ISC would like to thank Borja Marcos from Sarenet (with assistance by
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Iratxe Niño from Fundación Sarenet) for bringing this vulnerability to
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our attention. :gl:`#3622`
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- :iscman:`named` running as a resolver with the
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:any:`stale-answer-client-timeout` option set to any value greater
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than ``0`` could crash with an assertion failure, when the
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:any:`recursive-clients` soft quota was reached. This has been fixed.
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:cve:`2022-3924`
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ISC would like to thank Maksym Odinintsev from AWS for bringing this
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vulnerability to our attention. :gl:`#3619`
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New Features
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~~~~~~~~~~~~
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- The new :any:`update-quota` option can be used to control the number
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of simultaneous DNS UPDATE messages that can be processed to update an
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authoritative zone on a primary server, or forwarded to the primary
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server by a secondary server. The default is 100. A new statistics
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counter has also been added to record events when this quota is
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exceeded, and the version numbers for the XML and JSON statistics
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schemas have been updated. :gl:`#3523`
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Removed Features
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~~~~~~~~~~~~~~~~
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- The statements setting alternate local addresses for inbound zone
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transfers (``alt-transfer-source``, ``alt-transfer-source-v6``, and
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``use-alt-transfer-source``) have been removed. :gl:`#3714`
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- The Differentiated Services Code Point (DSCP) feature in BIND has been
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non-operational since the new Network Manager was introduced in BIND
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9.16. It is now marked as obsolete, and vestigial code implementing it
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has been removed. Configuring DSCP values in ``named.conf`` now causes
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a warning to be logged. :gl:`#3773`
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Feature Changes
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~~~~~~~~~~~~~~~
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- A new way of configuring the preferred source address when talking to
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remote servers, such as :any:`primaries` and :any:`parental-agents`,
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has been added: setting the ``source`` and/or ``source-v6`` arguments
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for a given statement is now possible. This new approach is intended
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to eventually replace statements such as :any:`parental-source`,
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:any:`parental-source-v6`, :any:`transfer-source`, etc. :gl:`#3762`
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- The code for DNS over TCP and DNS over TLS transports has been
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replaced with a new, unified transport implementation. :gl:`#3374`
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Bug Fixes
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~~~~~~~~~
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- A rare assertion failure was fixed in outgoing TCP DNS connection
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handling. :gl:`#3178` :gl:`#3636`
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- In addition to a previously fixed bug, another similar issue was
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discovered where quotas could be erroneously reached for servers,
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including any configured forwarders, resulting in SERVFAIL answers
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being sent to clients. This has been fixed. :gl:`#3752`
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- In certain query resolution scenarios (e.g. when following CNAME
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records), :iscman:`named` configured to answer from stale cache could
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return a SERVFAIL response despite a usable, non-stale answer being
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present in the cache. This has been fixed. :gl:`#3678`
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- When an outgoing request timed out, :iscman:`named` would retry up to
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three times with the same server instead of trying the next available
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name server. This has been fixed. :gl:`#3637`
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- Recently used ADB names and ADB entries (IP addresses) could get
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cleaned when ADB was under memory pressure. To mitigate this, only
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actual ADB names and ADB entries are now counted (excluding internal
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memory structures used for "housekeeping") and recently used (<= 10
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seconds) ADB names and entries are excluded from the overmem memory
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cleaner. :gl:`#3739`
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- The "Prohibited" Extended DNS Error was inadvertently set in some
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NOERROR responses. This has been fixed. :gl:`#3743`
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- Previously, TLS session resumption could have led to handshake
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failures when client certificates were used for authentication (Mutual
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TLS). This has been fixed. :gl:`#3725`
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Known Issues
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~~~~~~~~~~~~
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- There are no new known issues with this release. See :ref:`above
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<relnotes_known_issues>` for a list of all known issues affecting this
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BIND 9 branch.
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