1.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
2..
3.. SPDX-License-Identifier: MPL-2.0
4..
5.. This Source Code Form is subject to the terms of the Mozilla Public
6.. License, v. 2.0.  If a copy of the MPL was not distributed with this
7.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
8..
9.. See the COPYRIGHT file distributed with this work for additional
10.. information regarding copyright ownership.
11
12Notes for BIND 9.18.16
13----------------------
14
15Security Fixes
16~~~~~~~~~~~~~~
17
18- The overmem cleaning process has been improved, to prevent the cache from
19  significantly exceeding the configured :any:`max-cache-size` limit.
20  :cve:`2023-2828`
21
22  ISC would like to thank Shoham Danino from Reichman University, Anat
23  Bremler-Barr from Tel-Aviv University, Yehuda Afek from Tel-Aviv University,
24  and Yuval Shavitt from Tel-Aviv University for bringing this vulnerability to
25  our attention.  :gl:`#4055`
26
27- A query that prioritizes stale data over lookup triggers a fetch to refresh
28  the stale data in cache. If the fetch is aborted for exceeding the recursion
29  quota, it was possible for :iscman:`named` to enter an infinite callback
30  loop and crash due to stack overflow. This has been fixed. :cve:`2023-2911`
31  :gl:`#4089`
32
33New Features
34~~~~~~~~~~~~
35
36- The system test suite can now be executed with pytest (along with
37  pytest-xdist for parallel execution). :gl:`#3978`
38
39Removed Features
40~~~~~~~~~~~~~~~~
41
42- TKEY mode 2 (Diffie-Hellman Exchanged Keying) is now deprecated, and
43  will be removed in a future release. A warning will be logged when
44  the :any:`tkey-dhkey` option is used in ``named.conf``. :gl:`#3905`
45
46Bug Fixes
47~~~~~~~~~
48
49- BIND could get stuck on reconfiguration when a :any:`listen-on`
50  statement for HTTP is removed from the configuration. That has been
51  fixed. :gl:`#4071`
52
53- Previously, it was possible for a delegation from cache to be returned
54  to the client after the :any:`stale-answer-client-timeout` duration.
55  This has been fixed. :gl:`#3950`
56
57- BIND could allocate too big buffers when sending data via
58  stream-based DNS transports, leading to increased memory usage.
59  This has been fixed. :gl:`#4038`
60
61- When the :any:`stale-answer-enable` option was enabled and the
62  :any:`stale-answer-client-timeout` option was enabled and larger than
63  0, :iscman:`named` previously allocated two slots from the
64  :any:`clients-per-query` limit for each client and failed to gradually
65  auto-tune its value, as configured. This has been fixed. :gl:`#4074`
66
67Known Issues
68~~~~~~~~~~~~
69
70- There are no new known issues with this release. See :ref:`above
71  <relnotes_known_issues>` for a list of all known issues affecting this
72  BIND 9 branch.
73