diff --git a/doc/arm/notes.rst b/doc/arm/notes.rst index 71c94db774..197d649ac0 100644 --- a/doc/arm/notes.rst +++ b/doc/arm/notes.rst @@ -45,6 +45,7 @@ The list of known issues affecting the latest version in the 9.20 branch can be found at https://gitlab.isc.org/isc-projects/bind9/-/wikis/Known-Issues-in-BIND-9.20 +.. include:: ../notes/notes-9.20.5.rst .. include:: ../notes/notes-9.20.4.rst .. include:: ../notes/notes-9.20.3.rst .. include:: ../notes/notes-9.20.2.rst diff --git a/doc/notes/notes-9.20.5.rst b/doc/notes/notes-9.20.5.rst new file mode 100644 index 0000000000..cf185974e8 --- /dev/null +++ b/doc/notes/notes-9.20.5.rst @@ -0,0 +1,161 @@ +.. 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 9.20.5 +--------------------- + +Security Fixes +~~~~~~~~~~~~~~ + +- [CVE-2024-12705] DNS-over-HTTP(s) flooding fixes. + + 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. + + 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. + + 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` + +- Add a new option to configure the maximum number of outgoing queries + per client request. + + 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` + +Feature Changes +~~~~~~~~~~~~~~~ + +- The configuration clauses parental-agents and primaries are renamed to + remote-servers. + + 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` + +- Add none parameter to query-source and query-source-v6 to disable IPv4 + or IPv6 upstream queries. + + Add a none parameter to named configuration option `query-source` + (respectively `query-source-v6`) which forbid usage of IPv4 + (respectively IPv6) addresses when named is doing an upstream query. + :gl:`#4981` Turning-off upstream IPv6 queries while still listening to + downstream queries on IPv6. + +- Revert "Fix NSEC3 closest encloser lookup for names with empty + non-terminals" + + Revert the fix for #4950 for 9.20. + + This reverts MR !9438. + + History: A performance improvement for NSEC3 closest encloser lookups + (#4460) was introduced (in MR !9436) and backported to 9.20 (MR !9438) + and to 9.18 in (MR !9439). It was released in 9.18.30 (and 9.20.2 and + 9.21.1). + + There was a bug in the code (#4950), so we reverted the change in + !9611, !9613 and !9614 (not released). + + Then a new attempt was merged in main (MR !9610) and backported to + 9.20 (MR !9631) and 9.18 (MR !9632). The latter should not have been + backported and was reverted in !9689. + + We now also revert the fix for 9.20 :gl:`#5108` + +Bug Fixes +~~~~~~~~~ + +- Fix nsupdate hang when processing a large update. + + 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` + +- Fix possible assertion failure when reloading server while processing + updates. + + :gl:`#5006` + +- Preserve cache across reconfig when using attach-cache. + + 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` + +- Resolve the spurious drops in performance due GLUE cache. + + 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` + +- Fix dnssec-signzone signing non-DNSKEY RRsets with revoked keys. + + `dnssec-signzone` was using revoked keys for signing RRsets other than + DNSKEY. This has been corrected. :gl:`#5070` + +- Unknown directive in resolv.conf not handled properly. + + 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` + +- Fix response policy zones and catalog zones with an $INCLUDE statement + defined. + + Response policy zones (RPZ) and catalog zones were not working + correctly if they had an $INCLUDE statement defined. This has been + fixed. :gl:`#5111` + +