krb5 -- heap buffer overflow vulnerability in libkadm5srv

A MIT krb5 Security Advisory reports:

The MIT Kerberos 5 administration library (libkadm5srv)
contains a heap buffer overflow in password history
handling code which could be exploited to execute
arbitrary code on a Key Distribution Center (KDC)
host. The overflow occurs during a password change of a
principal with a certain password history state. An
administrator must have performed a certain password
policy change in order to create the vulnerable state.
An authenticated user, not necessarily one with
administrative privileges, could execute arbitrary code on
the KDC host, compromising an entire Kerberos realm.