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