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.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
..
.. SPDX-License-Identifier: MPL-2.0
..
.. This Source Code Form is subject to the terms of the Mozilla Public
.. License, v. 2.0. If a copy of the MPL was not distributed with this
.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
..
.. See the COPYRIGHT file distributed with this work for additional
.. information regarding copyright ownership.
Notes for BIND 9.16.27
----------------------
Security Fixes
~~~~~~~~~~~~~~
- The rules for acceptance of records into the cache have been tightened
to prevent the possibility of poisoning if forwarders send records
outside the configured bailiwick. (CVE-2021-25220)
ISC would like to thank Xiang Li, Baojun Liu, and Chaoyi Lu from
Network and Information Security Lab, Tsinghua University, and
Changgen Zou from Qi An Xin Group Corp. for bringing this
vulnerability to our attention. :gl:`#2950`
- TCP connections with ``keep-response-order`` enabled could leave the
TCP sockets in the ``CLOSE_WAIT`` state when the client did not
properly shut down the connection. (CVE-2022-0396) :gl:`#3112`
Feature Changes
~~~~~~~~~~~~~~~
- DEBUG(1)-level messages were added when starting and ending the BIND 9
task-exclusive mode that stops normal DNS operation (e.g. for
reconfiguration, interface scans, and other events that require
exclusive access to a shared resource). :gl:`#3137`
Bug Fixes
~~~~~~~~~
- The ``max-transfer-time-out`` and ``max-transfer-idle-out`` options
were not implemented when the BIND 9 networking stack was refactored
in 9.16. The missing functionality has been re-implemented and
outgoing zone transfers now time out properly when not progressing.
:gl:`#1897`
- TCP connections could hang indefinitely if the other party did not
read sent data, causing the TCP write buffers to fill. This has been
fixed by adding a "write" timer. Connections that are hung while
writing now time out after the ``tcp-idle-timeout`` period has
elapsed. :gl:`#3132`
- The statistics counter representing the current number of clients
awaiting recursive resolution results (``RecursClients``) could be
miscalculated in certain resolution scenarios, potentially causing the
value of the counter to drop below zero. This has been fixed.
:gl:`#3147`
Known Issues
~~~~~~~~~~~~
- There are no new known issues with this release. See :ref:`above
<relnotes_known_issues>` for a list of all known issues affecting this
BIND 9 branch.
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