Univention Corporate Server 4.2 erratum 535 (extended maintenance)

This update addresses the following issue:
* A vulnerability in ClamAV versions prior to 0.100.2 could allow an attacker
  to cause a denial of service (DoS) condition. The vulnerability is due to
  an error related to the MEW unpacker within the "unmew11()" function
  (libclamav/mew.c), which can be exploited to trigger an invalid read memory
  access via a specially crafted EXE file. (CVE-2018-15378)