krb5-1.9.1 is released

[Tom Yu]

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The MIT Kerberos Team announces the availability of MIT Kerberos 5
Release 1.9.1.  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 1.9.1
===================================

You may retrieve the Kerberos 5 Release 1.9.1 source from the
following URL:

        http://web.mit.edu/kerberos/dist/

The homepage for the krb5-1.9.1 release is:

        http://web.mit.edu/kerberos/krb5-1.9/

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

        http://web.mit.edu/kerberos/

and at the MIT Kerberos Consortium web site:

        http://www.kerberos.org/

DES transition
==============

The Data Encryption Standard (DES) is widely recognized as weak.  The
krb5-1.7 release contains measures to encourage sites to migrate away
- From using single-DES cryptosystems.  Among these is a configuration
variable that enables "weak" enctypes, which defaults to "false"
beginning with krb5-1.8.

Major changes in 1.9.1
======================

This is primarily a bugfix release.

* Fix vulnerabilities:
  ** kpropd denial of service [MITKRB5-SA-2011-001 CVE-2010-4022]
  ** KDC denial of service attacks [MITKRB5-SA-2011-002
     CVE-2011-0281 CVE-2011-0282 CVE-2011-0283]
  ** KDC double-free when PKINIT enabled [MITKRB5-SA-2011-003
     CVE-2011-0284]
  ** kadmind frees invalid pointer [MITKRB5-SA-2011-004 CVE-2011-0285]

* Interoperability:

  ** Don't reject AP-REQ messages if their PAC doesn't validate;
     suppress the PAC instead.

  ** Correctly validate HMAC-MD5 checksums that use DES keys
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