Security update for tiff (moderate)

This update for tiff fixes the following issues:

• CVE-2018-17100: There is a int32 overflow in multiply_ms in
  tools/ppm2tiff.c, which can cause a denial of service (crash) or
  possibly have unspecified other impact via a crafted image file.
  (bsc#1108637)
• CVE-2018-17101: There are two out-of-bounds writes in cpTags in
  tools/tiff2bw.c and tools/pal2rgb.c, which can cause a denial of service
  (application crash) or possibly have unspecified other impact via a
  crafted image file. (bsc#1108627)
• CVE-2018-17795: The function t2p_write_pdf in tiff2pdf.c allowed remote
  attackers to cause a denial of service (heap-based buffer overflow and
  application crash) or possibly have unspecified other impact via a
  crafted TIFF file, a similar issue to CVE-2017-9935. (bsc#1110358)
• CVE-2018-16335: newoffsets handling in ChopUpSingleUncompressedStrip in
  tif_dirread.c allowed remote attackers to cause a denial of service
  (heap-based buffer overflow and application crash) or possibly have
  unspecified other impact via a crafted TIFF file, as demonstrated by
  tiff2pdf. This is a different vulnerability than CVE-2018-15209.
  (bsc#1106853)

This update was imported from the SUSE:SLE-12:Update update project.