Security Fixes
~~~~~~~~~~~~~~
-- [CVE-2024-12705] DNS-over-HTTP(s) flooding fixes.
+- DNS-over-HTTPS flooding fixes. :cve:`2024-12705`
- Fix DNS-over-HTTP(S) implementation issues that arise under heavy
+ Fix DNS-over-HTTPS implementation issues that arise under heavy
query load. Optimize resource usage for :iscman:`named` instances that
- accept queries over DNS-over-HTTP(S).
+ accept queries over DNS-over-HTTPS.
- Previously, :iscman:`named` would process all incoming HTTP/2 data at
+ Previously, :iscman:`named` processed 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
+ clients that sent requests but did not 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 addition, :iscman:`named` now evaluates excessive streams opened by
+ clients that include no DNS data, which is 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`
+ In some cases, :iscman:`named` could leave DNS-over-HTTPS
+ connections in the `CLOSE_WAIT` state indefinitely. That has also been
+ fixed. :gl:`#5083`
-- [CVE-2024-11187] Limit the additional processing for large RDATA sets.
+ ISC would like to thank Jean-François Billaud for his assistance with
+ investigating this issue.
+
+- Limit additional section processing for large RDATA sets.
+ :cve:`2024-11187`
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`
+ the query-processing load. :gl:`#5034`
+
+ ISC would like to thank Toshifumi Sakaguchi for bringing this
+ vulnerability to our attention.
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
+ When the resolver is trying to query an authoritative server and
+ eventually times 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
+ The configuration option :any:`max-query-count` sets how many outgoing
+ queries per client request are allowed. The existing
+ :any:`max-recursion-queries` value 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`
+ The default for :any:`max-recursion-queries` is changed from 32 to
+ 50. This allows :any:`named` to send a few more queries
+ while looking up a single name. :gl:`#4980` :gl:`#4921`
Feature Changes
~~~~~~~~~~~~~~~
-- The configuration clauses parental-agents and primaries are renamed to
- remote-servers.
+- The configuration clauses ``parental-agents`` and ``primaries`` are renamed to
+ :any:`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`
+ The top blocks ``primaries`` and ``parental-agents`` are no longer
+ preferred and should be renamed to :any:`remote-servers`. The zone
+ statements :any:`parental-agents` and :any:`primaries` are still used, and may
+ refer to any :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.
+- Add `none` parameter to :namedconf:ref:`query-source` and
+ :namedconf:ref:`query-source-v6` to disable IPv4 or IPv6 upstream queries but
+ allow listening to queries from clients on IPv4 or IPv6. :gl:`#4981`
- Revert "Fix NSEC3 closest encloser lookup for names with empty
non-terminals"
9.21.1).
There was a bug in the code (#4950), so we reverted the change in
- !9611, !9613 and !9614 (not released).
+ !9611, !9613 and !9614.
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
Bug Fixes
~~~~~~~~~
-- Fix nsupdate hang when processing a large update.
+- Fix :iscman:`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`
+ To mitigate DNS flood attacks over a single TCP connection, 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 :iscman:`nsupdate`, which acts as a client. When
+ :iscman:`nsupdate` started throttling the connection, it never
+ attempted to read again. This has been fixed. :gl:`#4910`
- Fix possible assertion failure when reloading server while processing
- updates.
-
- :gl:`#5006`
+ update policy rules. :gl:`#5006`
-- Preserve cache across reconfig when using attach-cache.
+- Preserve cache across reconfig when using :any:`attach-cache`.
- When the `attach-cache` option is used in the `options` block with an
+ When the :any:`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.
+ to be created every time the server was reconfigured. This has been fixed.
:gl:`#5061`
-- Resolve the spurious drops in performance due GLUE cache.
+- Resolve the spurious drops in performance due to glue cache.
- For performance reasons, the returned GLUE records are cached on the
+ 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.
+- Fix :iscman:`dnssec-signzone` signing non-DNSKEY RRsets with revoked keys.
- `dnssec-signzone` was using revoked keys for signing RRsets other than
+ :any:`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.
+- Fix improper handling of unknown directives in ``resolv.conf``.
- 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`
+ The line after an unknown directive in ``resolv.conf`` could accidentally be
+ skipped, potentially affecting :iscman:`dig`, :iscman:`host`,
+ :iscman:`nslookup`, :iscman:`nsupdate`, or :iscman:`delv`. This has been
+ fixed. :gl:`#5084`
-- Fix response policy zones and catalog zones with an $INCLUDE statement
+- Fix response policy zones and catalog zones with an ``$INCLUDE`` statement
defined.
Response policy zones (RPZ) and catalog zones were not working
- correctly if they had an $INCLUDE statement defined. This has been
+ correctly if they had an ``$INCLUDE`` statement defined. This has been
fixed. :gl:`#5111`
projects / thirdparty / bind9.git / commitdiff
