krb5-1.18.3 is released

Greg Hudson ghudson at
Tue Nov 17 20:02:54 EST 2020

Hash: SHA512

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.


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

The homepage for the krb5-1.18.3 release is:

Further information about Kerberos 5 may be found at the following

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

* 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

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

* 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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