Univention Corporate Server 4.2 erratum 351 (security)

This update addresses the following issues:
* A vulnerability in OpenOffice's PPT file parser allows attackers to craft
  malicious documents that cause denial of service (memory corruption and
  application crash) potentially resulting in arbitrary code execution.
  (CVE-2017-12607)
* A vulnerability in Apache OpenOffice Writer DOC file parser allows
  attackers to craft malicious documents that cause denial of service (memory
  corruption and application crash) potentially resulting in arbitrary code
  execution. (CVE-2017-12608)
* Remote arbitrary file disclosure vulnerability via WEBSERVICE formula
  (CVE-2018-6871)
* Use after free in sdstor/stgstrms.cxx:StgSmallStrm class allows for denial
  of service with crafted document. (CVE-2018-10119)
* Out of bounds write in filter/ww8/ww8toolbar.cxx:SwCTBWrapper class allows
  for denial of service with crafted document. (CVE-2018-10120)