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01ac86f90b
A release note for CVE-2023-50868 was not included in BIND 9.19.21, even though that vulnerability was already addressed in that release (by the fix for CVE-2023-50387). Retroactively add a relevant release note for BIND 9.19.21.
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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 9.19.21
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----------------------
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Security Fixes
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~~~~~~~~~~~~~~
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- Validating DNS messages containing a lot of DNSSEC signatures could
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cause excessive CPU load, leading to a denial-of-service condition.
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This has been fixed. :cve:`2023-50387`
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ISC would like to thank Elias Heftrig, Haya Schulmann, Niklas Vogel,
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and Michael Waidner from the German National Research Center for
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Applied Cybersecurity ATHENE for bringing this vulnerability to our
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attention. :gl:`#4424`
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- Preparing an NSEC3 closest encloser proof could cause excessive CPU
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load, leading to a denial-of-service condition. This has been fixed.
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:cve:`2023-50868` :gl:`#4459`
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- Parsing DNS messages with many different names could cause excessive
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CPU load. This has been fixed. :cve:`2023-4408`
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ISC would like to thank Shoham Danino from Reichman University, Anat
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Bremler-Barr from Tel-Aviv University, Yehuda Afek from Tel-Aviv
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University, and Yuval Shavitt from Tel-Aviv University for bringing
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this vulnerability to our attention. :gl:`#4234`
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- Specific queries could cause :iscman:`named` to crash with an
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assertion failure when :any:`nxdomain-redirect` was enabled. This has
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been fixed. :cve:`2023-5517` :gl:`#4281`
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- A bad interaction between DNS64 and serve-stale could cause
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:iscman:`named` to crash with an assertion failure, when both of these
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features were enabled. This has been fixed. :cve:`2023-5679`
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:gl:`#4334`
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Feature Changes
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~~~~~~~~~~~~~~~
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- :iscman:`named-compilezone` no longer performs zone integrity checks
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by default; this allows faster conversion of a zone file from one
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format to another. :gl:`#4364`
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Zone checks can be performed by running :iscman:`named-checkzone`
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separately, or the previous default behavior can be restored by using:
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::
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named-compilezone -i full -k fail -n fail -r warn -m warn -M warn -S warn -T warn -W warn -C check-svcb:fail
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Bug Fixes
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~~~~~~~~~
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- The counters exported via the statistics channel were changed back to
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64-bit signed values; they were being inadvertently truncated to
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unsigned 32-bit values since BIND 9.15.0. :gl:`#4467`
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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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