Add CHANGES and release note for [GL #4424]

diff --git a/CHANGES b/CHANGES
index 095d027bb58014a484c2f0536eb8672d70c2f146..5a59e438b91401359a350f869247053c51e538bc 100644 (file)
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+6322.  [security]      Specific DNS answers could cause a denial-of-service
+                       condition due to DNS validation taking a long time.
+                       (CVE-2023-50387) [GL #4424]
+
 6321.  [security]      Change 6315 inadvertently introduced regressions that
                        could cause named to crash. [GL #4234]
 

diff --git a/doc/notes/notes-current.rst b/doc/notes/notes-current.rst
new file mode 100644 (file)
index 0000000..0a84c2c
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+++ b/doc/notes/notes-current.rst
@@ -0,0 +1,31 @@
+.. 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 9.19.21
+----------------------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- Validating DNS messages containing a lot of DNSSEC signatures could
+  cause excessive CPU load, leading to a denial-of-service condition.
+  This has been fixed. :cve:`2023-50387`
+
+  ISC would like to thank Elias Heftrig, Haya Schulmann, Niklas Vogel,
+  and Michael Waidner from the German National Research Center for
+  Applied Cybersecurity ATHENE. :gl:`#4424`
+
+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.