Univention Corporate Server 4.2 erratum 389 (security)

This update addresses the following issues:
* PJSIP allows remote attackers to cause a denial of service (buffer overflow
  and application crash) via a SIP packet with a crafted CSeq header in
  conjunction with a Via header that lacks a branch parameter.
  (CVE-2017-9372)
* The multi-part body parser in PJSIP allows remote attackers to cause a
  denial of service (out-of-bounds read and application crash) via a crafted
  packet. (CVE-2017-9359)