Univention Corporate Server 4.1 erratum 484 (extended maintenance)

This update addresses the following issue(s):
* Use-after-free vulnerability, where a malicious SMB1 request can be used
  to control the contents of heap memory via a deallocated heap pointer.
  It is possible this may be used to compromise the SMB server
  (CVE-2017-14746)
* Server heap memory information leak, where server allocated heap memory
  may be returned to the client without being cleared (CVE-2017-15275)