Univention Corporate Server 4.2 erratum 338 (security)

This update addresses the following issue:
* librelp contains a Buffer Overflow vulnerability in the checking of x509
  certificates from a peer that can result in Remote code execution. This
  attack appear to be exploitable a remote attacker that can connect to
  rsyslog and trigger a stack buffer overflow by sending a specially crafted
  x509 certificate. (CVE-2018-1000140)