Prepare release notes for BIND 9.21.13

doc/arm/notes.rst

@@ -47,6 +47,7 @@ The list of known issues affecting the latest version in the 9.21 branch can be
 found at
 https://gitlab.isc.org/isc-projects/bind9/-/wikis/Known-Issues-in-BIND-9.21
 
+.. include:: ../notes/notes-9.21.13.rst
 .. include:: ../notes/notes-9.21.12.rst
 .. include:: ../notes/notes-9.21.11.rst
 .. include:: ../notes/notes-9.21.10.rst

doc/notes/notes-9.21.13.rst

@@ -0,0 +1,168 @@
+.. 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 9.21.13
+----------------------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- [CVE-2025-8677] DNSSEC validation fails if matching but invalid DNSKEY
+  is found.
+
+  Previously, if a matching but cryptographically invalid key was
+  encountered during DNSSEC validation, the key was skipped and not
+  counted towards validation failures. :iscman:`named` now treats such
+  DNSSEC keys as hard failures and the DNSSEC validation fails
+  immediately, instead of continuing with the next DNSKEYs in the RRset.
+
+  ISC would like to thank Zuyao Xu and Xiang Li from the All-in-One
+  Security and Privacy Laboratory at Nankai University for bringing this
+  vulnerability to our attention. :gl:`#5343`
+
+- [CVE-2025-40778] Address various spoofing attacks.
+
+  Previously, several issues could be exploited to poison a DNS cache
+  with spoofed records for zones which were not DNSSEC-signed or if the
+  resolver was configured to not do DNSSEC validation. These issues were
+  assigned CVE-2025-40778 and have now been fixed.
+
+  As an additional layer of protection, :iscman:`named` no longer
+  accepts DNAME records or extraneous NS records in the AUTHORITY
+  section unless these are received via spoofing-resistant transport
+  (TCP, UDP with DNS cookies, TSIG, or SIG(0)).
+
+  ISC would like to thank Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin
+  Duan from Tsinghua University for bringing this vulnerability to our
+  attention. :gl:`#5414`
+
+- [CVE-2025-40780] Cache-poisoning due to weak pseudo-random number
+  generator.
+
+  It was discovered during research for an upcoming academic paper that
+  a xoshiro128\*\* internal state can be recovered by an external 3rd
+  party, allowing the prediction of UDP ports and DNS IDs in outgoing
+  queries. This could lead to an attacker spoofing the DNS answers with
+  great efficiency and poisoning the DNS cache.
+
+  The internal random generator has been changed to a cryptographically
+  secure pseudo-random generator.
+
+  ISC would like to thank Prof. Amit Klein and Omer Ben Simhon from
+  Hebrew University of Jerusalem for bringing this vulnerability to our
+  attention. :gl:`#5484`
+
+New Features
+~~~~~~~~~~~~
+
+- Add extra tokens to the zone file name template.
+
+  Extend the `$name`, `$view` and `$type` tokens (expanding into the
+  zone name, zone's view name and type); the new following tokens are
+  now also accepted:
+
+  - `$name` or `%s` is replaced with the zone name in lower case; -
+  `$type` or `%t` is replaced with the zone type -- i.e., primary,
+  secondary, etc); - `$view` or `%v` is replaced with the view name; -
+  `$char1` or `%1` is replaced with the first character of the zone
+  name; - `$char2` or `%2` is replaced with the second character of the
+  zone name   (or a dot if there is no second character); - `$char3` or
+  `%3` is replaced with the third character of the zone name (or   a dot
+  if there is no third character); - `$label1` or `%z` is replaced with
+  the toplevel domain of the zone (or a   dot if it is the root zone); -
+  `$label2` or `%y` is replaced with the next label under the toplevel
+  domain (or a dot if there is no next label); - `$label3` or `%x` is
+  replaced with the next-next label under the toplevel   domain (or a
+  dot if there is no next-next label). :gl:`#85`
+
+- Add support for synthetic records.
+
+  Add a query plugin which, in "reverse" mode, enables the server to
+  build a synthesized response to a PTR query when the PTR record
+  requested is not found in the zone.      The dynamically-built name is
+  constructed from a static prefix (passed as a plugin parameter), the
+  IP address (extracted from the query name) and a suffix (also passed
+  as a plugin parameter).  An `allow-synth` address-match list can be
+  used to limit the network addresses for which the plugin may generate
+  responses.      The plugin can also be used in "forward" mode, to
+  build synthesized A/AAAA records from names using the same format as
+  the dynamically-built PTR names. The same parameters are used: the
+  plugin will react and answer a query if the name matches the
+  configured prefix and origin, and encodes an IP address that is within
+  `allow-synth`. :gl:`#1586`
+
+- Support for zone-specific plugins.
+
+  Query plugins can now be configured at the `zone` level, as well as
+  globally or at the `view` level. A plugin's hooks are then called only
+  while that specific zone's database is being used to answer a query.
+
+  This simplifies the implementation of plugins that are only needed for
+  specific namespaces for which the server is authoritative. It can also
+  enable quicker responses, since plugins will only be called when they
+  are needed. :gl:`#5356`
+
+- Add dnssec-policy keys configuration check to named-checkconf.
+
+  A new option `-k` is added to `named-checkconf` that allows checking
+  the `dnssec-policy` `keys` configuration against the configured key
+  stores. If the found key files are not in sync with the given
+  `dnssec-policy`, the check will fail.
+
+  This is useful to run before migrating to `dnssec-policy`. :gl:`#5486`
+
+Removed Features
+~~~~~~~~~~~~~~~~
+
+- Remove randomized RRset ordering.
+
+  The rrset-order random doesn't offer uniform distribution of all
+  permutations and it isn't superior to cyclic order in any way.  Make
+  the random ordering an alias to the cyclic ordering. :gl:`#5513`
+
+Bug Fixes
+~~~~~~~~~
+
+- Use signer name when disabling DNSSEC algorithms.
+
+  ``disable-algorithms`` could cause DNSSEC validation failures when the
+  parent zone was signed with the algorithms that were being disabled
+  for the child zone. This has been fixed; `disable-algorithms` now
+  works on a whole-of-zone basis.
+
+  If the zone's name is at or below the ``disable-algorithms`` name the
+  algorithm is disabled for that zone, using deepest match when there
+  are multiple ``disable-algorithms`` clauses.  :gl:`#5165`
+
+- Rndc sign during ZSK rollover will now replace signatures.
+
+  When performing a ZSK rollover, if the new DNSKEY is omnipresent, the
+  :option:`rndc sign` command now signs the zone completely with the
+  successor key, replacing all zone signatures from the predecessor key
+  with new ones. :gl:`#5483`
+
+- Missing DNSSEC information when CD bit is set in query.
+
+  The RRSIGs for glue records were not being cached correctly for CD=1
+  queries.  This has been fixed. :gl:`#5502`
+
+- Add chroot check to meson.build.
+
+  The meson build procedure was not checking for the existence of the
+  chroot function.  This has been fixed. :gl:`#5519`
+
+- Preserve cache when reload fails and reload the server again.
+
+  Fixes an issue where failing to reconfigure/reload the server would
+  prevent to preserved the views caches on the subsequent server
+  reconfiguration/reload. :gl:`#5523`
+
+