bind/doc/notes/notes-9.19.17.rst

.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
..
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Notes for BIND 9.19.17
----------------------

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

- Previously, sending a specially crafted message over the control
  channel could cause the packet-parsing code to run out of available
  stack memory, causing :iscman:`named` to terminate unexpectedly.
  This has been fixed. :cve:`2023-3341`

  ISC would like to thank Eric Sesterhenn from X41 D-Sec GmbH for
  bringing this vulnerability to our attention. :gl:`#4152`

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

- Support for User Statically Defined Tracing (USDT) probes has been
  added. These probes enable fine-grained application tracing and
  introduce no overhead when they are not enabled. :gl:`#4041`

- The client-side support of the EDNS EXPIRE option has been expanded to
  include IXFR and AXFR query types. This enhancement enables
  :iscman:`named` to perform AXFR and IXFR queries while incorporating
  the EDNS EXPIRE option. :gl:`#4170`

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

- The :any:`dnssec-must-be-secure` option has been deprecated and will
  be removed in a future release. :gl:`#4263`

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

- Compiling with jemalloc versions older than 4.0.0 is no longer
  supported; those versions do not provide the features required by
  current BIND 9 releases. :gl:`#4296`

- If the ``server`` command is specified, :iscman:`nsupdate` now honors
  the :option:`nsupdate -v` option for SOA queries by sending both the
  UPDATE request and the initial query over TCP. :gl:`#1181`

Bug Fixes
~~~~~~~~~

- The value of the If-Modified-Since header in the statistics channel
  was not being correctly validated for its length, potentially allowing
  an authorized user to trigger a buffer overflow. Ensuring the
  statistics channel is configured correctly to grant access exclusively
  to authorized users is essential (see the :any:`statistics-channels`
  block definition and usage section). :gl:`#4124`

  This issue was reported independently by Eric Sesterhenn of X41 D-Sec
  GmbH and Cameron Whitehead.

- The Content-Length header in the statistics channel was lacking proper
  bounds checking. A negative or excessively large value could
  potentially trigger an integer overflow and result in an assertion
  failure. :gl:`#4125`

  This issue was reported by Eric Sesterhenn of X41 D-Sec GmbH.

- Several memory leaks caused by not clearing the OpenSSL error stack
  were fixed. :gl:`#4159`

  This issue was reported by Eric Sesterhenn of X41 D-Sec GmbH.

- The introduction of ``krb5-subdomain-self-rhs`` and
  ``ms-subdomain-self-rhs`` UPDATE policies accidentally caused
  :iscman:`named` to return SERVFAIL responses to deletion requests for
  non-existent PTR and SRV records. This has been fixed. :gl:`#4280`

- The :any:`stale-refresh-time` feature was mistakenly disabled when the
  server cache was flushed by :option:`rndc flush`. This has been fixed.
  :gl:`#4278`

- BIND's memory consumption has been improved by implementing dedicated
  jemalloc memory arenas for sending buffers. This optimization ensures
  that memory usage is more efficient and better manages the return of
  memory pages to the operating system. :gl:`#4038`

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.