Multi-realm KDC null deref [CVE-2013-1418]

If a KDC serves multiple realms, certain requests can cause
setup_server_realm() to dereference a null pointer, crashing the KDC.

CVSSv2: AV:N/AC:M/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C

A related but more minor vulnerability requires authentication to
exploit, and is only present if a third-party KDC database module can
dereference a null pointer under certain conditions.

(back ported from commit 5d2d9a1abe46a2c1a8614d4672d08d9d30a5f8bf)

ticket: 7756 (new)
version_fixed: 1.11.4
status: resolved
Fix reference for trace logging

The documentation change in #7727 depends on missing link target for
the trace logging section in doc/admin/troubleshoot.rst.  Add it.

ticket: 7758 (new)
version_fixed: 1.11.4
status: resolved
Updates for krb5-1.11.4
Update for krb5-1.11.4-postrelease