--- /dev/null
+.. 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.
+
+BIND 9.21.4
+-----------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- [CVE-2024-12705] DNS-over-HTTP(s) flooding fixes. ``bddaff32104``
+
+ Fix DNS-over-HTTP(S) implementation issues that arise under heavy
+ query load. Optimize resource usage for :iscman:`named` instances that
+ accept queries over DNS-over-HTTP(S).
+
+ Previously, :iscman:`named` would process all incoming HTTP/2 data at
+ once, which could overwhelm the server, especially when dealing with
+ clients that send requests but don't wait for responses. That has been
+ fixed. Now, :iscman:`named` handles HTTP/2 data in smaller chunks and
+ throttles reading until the remote side reads the response data. It
+ also throttles clients that send too many requests at once.
+
+ Additionally, :iscman:`named` now carefully processes data sent by
+ some clients, which can be considered "flooding." It logs these
+ clients and drops connections from them. :gl:`#4795`
+
+ In some cases, :iscman:`named` could leave DNS-over-HTTP(S)
+ connections in the `CLOSE_WAIT` state indefinitely. That also has been
+ fixed. ISC would like to thank JF Billaud for thoroughly investigating
+ the issue and verifying the fix. :gl:`#5083` :gl:`#4795` :gl:`#5083`
+
+- [CVE-2024-11187] Limit the additional processing for large RDATA sets.
+ ``4d054cca7a0``
+
+ When answering queries, don't add data to the additional section if
+ the answer has more than 13 names in the RDATA. This limits the number
+ of lookups into the database(s) during a single client query, reducing
+ query processing load. :gl:`#5034`
+
+New Features
+~~~~~~~~~~~~
+
+- Add Extended DNS Error Code 22 - No Reachable Authority.
+ ``3972eacdad2``
+
+ When the resolver is trying to query an authority server and
+ eventually timed out, a SERVFAIL answer is given to the client. Add
+ the Extended DNS Error Code 22 - No Reachable Authority to the
+ response. :gl:`#2268` :gl:`!9743`
+
+- Enable extraction of exact local socket addresses. ``44d5dbeab63``
+
+ Enable extracting the exact address/port that a local wildcard/TCP
+ socket is bound to, improving the accuracy of dnstap logging and
+ providing more information in debug logs produced by system tests.
+ Since this requires issuing an extra system call on some hot paths,
+ this new feature is only enabled when the ``ISC_SOCKET_DETAILS``
+ preprocessor macro is set at compile time. :gl:`#4344` :gl:`!8348`
+
+- Log both "from" and "to" socket in debug messages. ``6230bc883a5``
+
+ Debug messages logging network traffic now include information about
+ both sides of each communication channel rather than just one of them.
+ :gl:`#4345` :gl:`!8349`
+
+- Add "Zone has [AAAA/A] records but is not served by IPv[6/4]"
+ warnings. ``ef6dc36e530``
+
+ Check that zones with AAAA records are served by IPv6 servers and that
+ zones with A records are served by IPv4 servers. Sometimes, IPv6
+ services are accidentally misconfigured and zones with IPv6 (AAAA)
+ address records are not served by DNS servers with IPv6 addresses,
+ which means they need to use translation devices to look up those IPv6
+ addresses. The reverse is also sometimes true: zones with A records
+ are not resolvable over IPv4 when they should be. To prevent this,
+ BIND now looks for these misconfigured zones and issues a warning if
+ they are found. :gl:`#4370` :gl:`!8393`
+
+- Add a new option to configure the maximum number of outgoing queries
+ per client request. ``80a5745a1f8``
+
+ The configuration option 'max-query-count' sets how many outgoing
+ queries per client request is allowed. The existing
+ 'max-recursion-queries' is the number of permissible queries for a
+ single name and is reset on every CNAME redirection. This new option
+ is a global limit on the client request. The default is 200.
+
+ This allows us to send a bit more queries while looking up a single
+ name. The default for 'max-recursion-queries' is changed from 32 to
+ 50. :gl:`#4980` :gl:`#4921` :gl:`!9737`
+
+Removed Features
+~~~~~~~~~~~~~~~~
+
+- Remove dnssec-must-be-secure feature. ``f5f792f1ed2``
+
+ :gl:`#4482` :gl:`!9851`
+
+- Remove 'sortlist' option. ``2bce06e170a``
+
+ The `sortlist` option, which was deprecated in BIND 9.20, has now been
+ removed. :gl:`#4665` :gl:`!9839`
+
+- Remove fixed value for the rrset-order option. ``5bee088dd1f``
+
+ Remove the "fixed" value from the "rrset-order" option and from the
+ autoconf script. :gl:`#4666` :gl:`!9852`
+
+- Remove the log message about incomplete IPv6 API. ``3779a81d501``
+
+ The log message would not be ever reached, because the IPv6 API is
+ always considered to be complete. Just remove the dead code.
+ :gl:`#5068` :gl:`!9798`
+
+- Remove trusted-keys and managed-keys options. ``9de6b228d41``
+
+ These options have been deprecated in 9.19 in favor of the
+ 'trust-anchors' option and are now being removed. :gl:`#5080`
+ :gl:`!9855`
+
+- Drop single-use RETERR macro. ``f6ff4fff85e``
+
+ If the RETERR define is only used once in a file, just drop the macro.
+ :gl:`!9871`
+
+- Remove C++ support from the public header. ``8d9bc93e81e``
+
+ Since BIND 9 headers are not longer public, there's no reason to keep
+ the ISC_LANG_BEGINDECL and ISC_LANG_ENDDECL macros to support
+ including them from C++ projects. :gl:`!9925`
+
+- Remove DLV remnants. ``f4377a3cd69``
+
+ DLV is long gone, so we can remove design documentation around DLV,
+ related command line options (that were already a hard failure), and
+ some DLV related test remnants. :gl:`!9888`
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- Update picohttpparser.{c,h} with upstream repository. ``9428077f481``
+
+ :gl:`#4485` :gl:`!9857`
+
+- The configuration clauses parental-agents and primaries are renamed to
+ remote-servers. ``858ba71eafc``
+
+ The top blocks 'primaries' and 'parental-agents' are no longer
+ preferred and should be renamed to 'remote-servers'. The zone
+ statements 'parental-agents' and 'primaries' are still used, and may
+ refer to any 'remote-servers' top block. :gl:`#4544` :gl:`!9822`
+
+- Add TLS SNI extension to all outgoing TLS connections. ``6eb77ed2b07``
+
+ This change ensures that SNI extension is used in outgoing connections
+ over TLS (e.g. for DoT and DoH) when applicable. :gl:`#5099`
+ :gl:`!9923`
+
+- Detect and possibly define constexpr using Autoconf. ``1fea227ab8b``
+
+ Previously, we had an ISC_CONSTEXPR macro that was expanded to either
+ `constexpr` or `static const`, depending on compiler support. To make
+ the code cleaner, move `constexpr` support detection to Autoconf; if
+ `constexpr` support is missing from the compiler, define `constexpr`
+ as `static const` in config.h. :gl:`!9924`
+
+- Remove unused maxquerycount. ``43622594f48``
+
+ Related to #4980 :gl:`!9850`
+
+- Use query counters in validator code. ``63060314098``
+
+ Commit af7db8951364a89c468eda1535efb3f53adc2c1f as part of #4141 was
+ supposed to apply the 'max-recursion-queries' quota to validator
+ queries, but the counter was never actually passed on to
+ 'dns_resolver_createfetch()'. This has been fixed, and the global
+ query counter ('max-query-count', per client request) is now also
+ added.
+
+ Related to #4980 :gl:`!9856`
+
+Bug Fixes
+~~~~~~~~~
+
+- Accept resolv.conf with more than 8 search domains. ``eda02dc3424``
+
+ :gl:`#1259` :gl:`!2446`
+
+- Fix nsupdate hang when processing a large update. ``fa56e0d8b10``
+
+ To mitigate DNS flood attacks over a single TCP connection, we
+ throttle the connection when the other side does not read the data.
+ Throttling should only occur on server-side sockets, but erroneously
+ also happened for nsupdate, which acts as a client. When nsupdate
+ started throttling the connection, it never attempts to read again.
+ This has been fixed. :gl:`#4910` :gl:`!9709`
+
+- Lock and attach when returning zone stats. ``3c720c64250``
+
+ When returning zone statistics counters, the statistics sets are now
+ attached while the zone is locked. This addresses Coverity warnings
+ CID 468720, 468728 and 468729. :gl:`#4934` :gl:`!9488`
+
+- Fix possible assertion failure when reloading server while processing
+ updates. ``be5266a7c61``
+
+ :gl:`#5006` :gl:`!9745`
+
+- Preserve cache across reconfig when using attach-cache.
+ ``0b287f3aaf9``
+
+ When the `attach-cache` option is used in the `options` block with an
+ arbitrary name, it causes all views to use the same cache. Previously,
+ this configuration caused the cache to be deleted and a new cache
+ created every time the server was reconfigured. This has been fixed.
+ :gl:`#5061` :gl:`!9787`
+
+- Resolve the spurious drops in performance due GLUE cache.
+ ``e2c1941efd2``
+
+ For performance reasons, the returned GLUE records are cached on the
+ first use. The current implementation could randomly cause a
+ performance drop and increased memory use. This has been fixed.
+ :gl:`#5064` :gl:`!9831`
+
+- Fix dnssec-signzone signing non-DNSKEY RRsets with revoked keys.
+ ``1435770b1a7``
+
+ `dnssec-signzone` was using revoked keys for signing RRsets other than
+ DNSKEY. This has been corrected. :gl:`#5070` :gl:`!9800`
+
+- Disable deterministic ecdsa for fips builds. ``707dded9798``
+
+ FIPS 186-5 [1] allows the usage deterministic ECDSA (Section 6.3)
+ which is compabile with RFC 6979 [2] but OpenSSL seems to follow FIPS
+ 186-4 (Section 6.3) [3] which only allows for random k values, failing
+ k value generation for OpenSSL >=3.2. [4]
+
+ Fix signing by not using deterministic ECDSA when FIPS mode is active.
+
+ [1]: https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-5.pdf [2]:
+ https://datatracker.ietf.org/doc/html/rfc6979 [3]:
+ https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf [4]: https:
+ //github.com/openssl/openssl/blob/85f17585b0d8b55b335f561e2862db14a20b
+ 1e64/crypto/ec/ecdsa_ossl.c#L201-L207 :gl:`#5072` :gl:`!9808`
+
+- Revert "Lock and attach when returning zone stats" ``de6f199f4d2``
+
+ :gl:`#5082` :gl:`!9859`
+
+- Unknown directive in resolv.conf not handled properly. ``48901ef57e7``
+
+ The line after an unknown directive in resolv.conf could accidentally
+ be skipped, potentially affecting dig, host, nslookup, nsupdate, or
+ delv. This has been fixed. :gl:`#5084` :gl:`!9865`
+
+- Querying an NSEC3-signed zone for an empty record could trigger an
+ assertion. ``3a94afa03a1``
+
+ A bug in the qpzone database could trigger a crash when querying for a
+ deleted name, or a newly-added empty non-terminal name, in an
+ NSEC3-signed zone. This has been fixed. :gl:`#5108` :gl:`!9928`
+
+- Fix response policy zones and catalog zones with an $INCLUDE statement
+ defined. ``19a2aab136a``
+
+ Response policy zones (RPZ) and catalog zones were not working
+ correctly if they had an $INCLUDE statement defined. This has been
+ fixed. :gl:`#5111` :gl:`!9930`
+
+- Clean up incorrect logging module names. ``3db39ec7ad5``
+
+ Some files used logmodule names that had been copied in from
+ elsewhere; these have now been given module names of their own. Also,
+ the RBT and RBTDB logmodules have been removed, since they are now
+ unused. :gl:`!9895`
+
+- Finalize removal of memory debug flags size and mctx. ``667383587b2``
+
+ Commit 4b3d0c66009d30f5c0bc12ee128fc59f1d853f44 has removed them, but
+ did not remove few traces in documentation and help. Remove them from
+ remaining places. :gl:`!9606`
+
+- Mark loop as shuttingdown earlier in shutdown_cb. ``d71869d6a78``
+
+ :gl:`!9827`
+
+- Use CMM_{STORE,LOAD}_SHARED to store/load glue in gluelist.
+ ``6ce55429f14``
+
+ ThreadSanitizer has trouble understanding that gluelist->glue is
+ constant after it is assigned to the slabheader with cmpxchg. Help
+ ThreadSanitizer to understand the code by using CMM_STORE_SHARED and
+ CMM_LOAD_SHARED on gluelist->glue. :gl:`!9929`
+
+
projects / thirdparty / bind9.git / commitdiff
