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The MIT Kerberos Team announces the availability of MIT Kerberos 5
Release 1.18.3. Please see below for a list of some major changes
included, or consult the README file in the source tree for a more
detailed list of significant changes.

RETRIEVING KERBEROS 5 RELEASE 1.18.3
====================================

You may retrieve the Kerberos 5 Release 1.18.3 source from the
following URL:

https://kerberos.org/dist/

The homepage for the krb5-1.18.3 release is:

https://web.mit.edu/kerberos/krb5-1.18/

Further information about Kerberos 5 may be found at the following
URL:

https://web.mit.edu/kerberos/


DES no longer supported
=======================

Beginning with the krb5-1.18 release, single-DES encryption types are
no longer supported.


Major changes in 1.18.3 (2020-11-17)
====================================

This is a bug fix release.

* Fix a denial of service vulnerability when decoding Kerberos
protocol messages.

* Fix a locking issue with the LMDB KDB module which could cause KDC
and kadmind processes to lose access to the database.

* Fix an assertion failure when libgssapi_krb5 is repeatedly loaded
and unloaded while libkrb5support remains loaded.

Major changes in 1.18.2 (2020-05-21)
====================================

This is a bug fix release.

* Fix a SPNEGO regression where an acceptor using the default
credential would improperly filter mechanisms, causing a negotiation
failure.

* Fix a bug where the KDC would fail to issue tickets if the local
krbtgt principal's first key has a single-DES enctype.

* Add stub functions to allow old versions of OpenSSL libcrypto to
link against libkrb5.

* Fix a NegoEx bug where the client name and delegated credential
might not be reported.

Major changes in 1.18.1 (2020-04-13)
====================================

This is a bug fix release.

* Fix a crash when qualifying short hostnames when the system has no
primary DNS domain.

* Fix a regression when an application imports "service@" as a GSS
host-based name for its acceptor credential handle.

* Fix KDC enforcement of auth indicators when they are modified by the
KDB module.

* Fix removal of require_auth string attributes when the LDAP KDB
module is used.

* Fix a compile error when building with musl libc on Linux.

* Fix a compile error when building with gcc 4.x.

* Change the KDC constrained delegation precedence order for
consistency with Windows KDCs.

Major changes in 1.18 (2020-02-12)
==================================

Administrator experience:

* Remove support for single-DES encryption types.

* Change the replay cache format to be more efficient and robust.
Replay cache filenames using the new format end with ".rcache2" by
default.

* setuid programs will automatically ignore environment variables that
normally affect krb5 API functions, even if the caller does not use
krb5_init_secure_context().

* Add an "enforce_ok_as_delegate" krb5.conf relation to disable
credential forwarding during GSSAPI authentication unless the KDC
sets the ok-as-delegate bit in the service ticket.

* Use the permitted_enctypes krb5.conf setting as the default value
for default_tkt_enctypes and default_tgs_enctypes.

Developer experience:

* Implement krb5_cc_remove_cred() for all credential cache types.

* Add the krb5_pac_get_client_info() API to get the client account
name from a PAC.

Protocol evolution:

* Add KDC support for S4U2Self requests where the user is identified
by X.509 certificate. (Requires support for certificate lookup from
a third-party KDB module.)

* Remove support for an old ("draft 9") variant of PKINIT.

* Add support for Microsoft NegoEx. (Requires one or more third-party
GSS modules implementing NegoEx mechanisms.)

* Honor the transited-policy-checked ticket flag on application
servers, eliminating the requirement to configure capaths on
servers in some scenarios.

User experience:

* Add support for "dns_canonicalize_hostname=fallback""`, causing
host-based principal names to be tried first without DNS
canonicalization, and again with DNS canonicalization if the
un-canonicalized server is not found.

* Expand single-component hostnames in host-based principal names when
DNS canonicalization is not used, adding the system's first DNS
search path as a suffix. Add a "qualify_shortname" krb5.conf
relation to override this suffix or disable expansion.

Code quality:

* The libkrb5 serialization code (used to export and import krb5 GSS
security contexts) has been simplified and made type-safe.

* The libkrb5 code for creating KRB-PRIV, KRB-SAFE, and KRB-CRED
messages has been revised to conform to current coding practices.

* The test suite has been modified to work with macOS System Integrity
Protection enabled.

* The test suite incorporates soft-pkcs11 so that PKINIT PKCS11
support can always be tested.
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