Univention Corporate Server 4.2 erratum 390 (security)

This update addresses the following issues:
* CVE-2017-9406: a memory leak vulnerability was found in the function
  gmalloc in gmem.cc, which allows attackers to cause a denial of service via
  a crafted file.
* CVE-2017-9408: memory leak in the function Object::initArray in Object.cc
  that allows attackers to cause a DoS via a crafted file.
* CVE-2017-9775: Stack buffer overflow in GfxState.cc in pdftocairo that
  allows remote attackers to cause a denial of service (application crash)
  via a crafted PDF document.
* CVE-2017-9776: Integer overflow leading to Heap buffer overflow in
  JBIG2Stream.cc in pdftocairo allows remote attackers to cause a denial of
  service (application crash) or possibly have unspecified other impact via a
  crafted PDF document.
* CVE-2017-9865: The function GfxImageColorMap::getGray in GfxState.cc allows
  remote attackers to cause a denial of service (stack-based buffer over-read
  and application crash) via a crafted PDF document
* CVE-2017-14517: NULL pointer dereference vulnerability in the
  XRef::parseEntry() function in XRef.cc
* CVE-2017-14518: Floating point exception in the
  isImageInterpolationRequired() function in Splash.cc
* CVE-2017-14519: A memory corruption may occur in a call to
  Object::streamGetChar
* CVE-2017-14520: Floating point exception in Splash::scaleImageYuXd()
* CVE-2017-14617: Floating point exception in the ImageStream class in
  Stream.cc
* CVE-2017-14929: Memory corruption via Gfx.cc infinite loop
* CVE-2017-14975: NULL pointer dereference vulnerability in the
  FoFiType1C::convertToType0 function in FoFiType1C.cc
* CVE-2017-14976: Heap-based buffer over-read vulnerability in the
* CVE-2017-14977: NULL pointer dereference vulnerability in the
  FoFiTrueType::getCFFBlock function in FoFiTrueType.cc
* CVE-2017-15565: NULL Pointer Dereference in the
  GfxImageColorMap::getGrayLine() function in GfxState.cc
* CVE-2017-1000456: Invalid read in TextPool::addWord() causes crash and can
  lead to overflow in subsequent calculations