bind/doc/notes/notes-current.rst

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Notes for BIND 9.18.11
----------------------

Security Fixes
~~~~~~~~~~~~~~

- An UPDATE message flood could cause :iscman:`named` to exhaust all
  available memory. This flaw was addressed by adding a new
  :any:`update-quota` option that controls the maximum number of
  outstanding DNS UPDATE messages that :iscman:`named` can hold in a
  queue at any given time (default: 100). (CVE-2022-3094)

  ISC would like to thank Rob Schulhof from Infoblox for bringing this
  vulnerability to our attention. :gl:`#3523`

- :iscman:`named` could crash with an assertion failure when an RRSIG
  query was received and :any:`stale-answer-client-timeout` was set to a
  non-zero value. This has been fixed. (CVE-2022-3736)

  ISC would like to thank Borja Marcos from Sarenet (with assistance by
  Iratxe Niño from Fundación Sarenet) for bringing this vulnerability to
  our attention. :gl:`#3622`

New Features
~~~~~~~~~~~~

- The new :any:`update-quota` option can be used to control the number
  of simultaneous DNS UPDATE messages that can be processed to update an
  authoritative zone on a primary server, or forwarded to the primary
  server by a secondary server. The default is 100. A new statistics
  counter has also been added to record events when this quota is
  exceeded, and the version numbers for the XML and JSON statistics
  schemas have been updated. :gl:`#3523`

Removed Features
~~~~~~~~~~~~~~~~

- The Differentiated Services Code Point (DSCP) feature in BIND
  has been non-operational since the new Network Manager was introduced
  in BIND 9.16. It is now marked as obsolete, and vestigial code
  implementing it has been removed. Configuring DSCP values in
  ``named.conf`` will cause a warning to be logged. :gl:`#3773`

Feature Changes
~~~~~~~~~~~~~~~

- None.

Bug Fixes
~~~~~~~~~

- TLS session resumption might lead to handshake failures when client
  certificates are used for authentication (Mutual TLS).  This has
  been fixed. :gl:`#3725`

- When an outgoing request timed out, the ``named`` would retry up to three
  times with the same server instead of trying a next available name server.
  This has been fixed. :gl:`#3637`

- Recently used ADB names and ADB entries (IP addresses) could get cleaned when
  ADB would be under memory pressure.  To mitigate this, count only actual ADB
  names and ADB entries into the overmem memory limit (exclude internal memory
  structures used for "housekeeping") and exclude recently used (<= 10 seconds)
  ADB names and entries from the overmem memory cleaner. :gl:`#3739`

- Fix a rare assertion failure in the outgoing TCP DNS connection handling.
  :gl:`#3178` :gl:`#3636`

- In addition to a previously fixed bug, another similar issue was discovered
  where quotas could be erroneously reached for servers, including any
  configured forwarders, resulting in SERVFAIL answers being sent to clients.
  This has been fixed. :gl:`#3752`

- Clients may see an unexpected "Prohibited" extended DNS error when ``named``
  is configured with :any:`allow-recursion`). :gl:`#3743`

- Fix a TLS error that occured with large transfers over XoT. :gl:`#3772`

Known Issues
~~~~~~~~~~~~

- There are no new known issues with this release. See :ref:`above
  <relnotes_known_issues>` for a list of all known issues affecting this
  BIND 9 branch.