1e75f3ae33
The new :cve: Sphinx role takes a CVE number as an argument and creates
a hyperlink to the relevant ISC Knowledgebase document that might have
more up-to-date or verbose information than the relevant release note.
This makes reaching ISC Knowledgebase pages directly from the release
notes easier.
Make all CVE references in the release notes use the new Sphinx role.
(cherry picked from commit 41b857e567)
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87 lines
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ReStructuredText
.. 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 9.16.22
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----------------------
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Security Fixes
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~~~~~~~~~~~~~~
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- The ``lame-ttl`` option controls how long ``named`` caches certain
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types of broken responses from authoritative servers (see the
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`security advisory <https://kb.isc.org/docs/cve-2021-25219>`_ for
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details). This caching mechanism could be abused by an attacker to
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significantly degrade resolver performance. The vulnerability has been
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mitigated by changing the default value of ``lame-ttl`` to ``0`` and
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overriding any explicitly set value with ``0``, effectively disabling
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this mechanism altogether. ISC's testing has determined that doing
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that has a negligible impact on resolver performance while also
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preventing abuse. Administrators may observe more traffic towards
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servers issuing certain types of broken responses than in previous
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BIND 9 releases, depending on client query patterns. :cve:`2021-25219`
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ISC would like to thank Kishore Kumar Kothapalli of Infoblox for
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bringing this vulnerability to our attention. :gl:`#2899`
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Feature Changes
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~~~~~~~~~~~~~~~
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- The use of native PKCS#11 for Public-Key Cryptography in BIND 9 has
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been deprecated in favor of the engine_pkcs11 OpenSSL engine from the
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`OpenSC`_ project. The ``--with-native-pkcs11`` configuration option
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will be removed in the next major BIND 9 release. The option to use
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the engine_pkcs11 OpenSSL engine is already available in BIND 9;
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please see the :ref:`ARM section on PKCS#11 <pkcs11>` for details.
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:gl:`#2691`
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- Old-style Dynamically Loadable Zones (DLZ) drivers that had to be
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enabled in ``named`` at build time have been marked as deprecated in
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favor of new-style DLZ modules. Old-style DLZ drivers will be removed
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in the next major BIND 9 release. :gl:`#2814`
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- The ``map`` zone file format has been marked as deprecated and will be
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removed in the next major BIND 9 release. :gl:`#2882`
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- ``named`` and ``named-checkconf`` now exit with an error when a single
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port configured for ``query-source``, ``transfer-source``,
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``notify-source``, ``parental-source``, and/or their respective IPv6
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counterparts clashes with a global listening port. This configuration
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has not been supported since BIND 9.16.0, but no error was reported
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until now (even though sending UDP messages such as NOTIFY failed).
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:gl:`#2888`
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- ``named`` and ``named-checkconf`` now issue a warning when there is a
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single port configured for ``query-source``, ``transfer-source``,
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``notify-source``, ``parental-source``, and/or for their respective
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IPv6 counterparts. :gl:`#2888`
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.. _OpenSC: https://github.com/OpenSC/libp11
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Bug Fixes
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~~~~~~~~~
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- A recent change introduced in BIND 9.16.21 inadvertently broke
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backward compatibility for the ``check-names master ...`` and
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``check-names slave ...`` options, causing them to be silently
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ignored. This has been fixed and these options now work properly
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again. :gl:`#2911`
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- When new IP addresses were set up by the operating system during
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``named`` startup, it could fail to listen for TCP connections on the
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newly added interfaces. :gl:`#2852`
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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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