Univention Corporate Server 4.3 erratum 593 (security)

This update addresses the following issue:
* An exploitable code execution vulnerability exists in the quota file
  functionality of E2fsprogs. A specially crafted ext4 partition can cause an
  out-of-bounds write on the heap, resulting in code execution. An attacker
  can corrupt a partition to trigger this vulnerability. (CVE-2019-5094)