Univention Corporate Server 4.1 erratum 410 (security)

This update addresses the following issues:
* Applications using libtiff can trigger buffer overflows through
  TIFFGetField() when processing TIFF images with unknown tags
  (CVE-2015-7554, CVE-2016-5318)
* an out of bounds write in tif_luv.c (CVE-2015-8781)
* other out-of-bounds writes (CVE-2015-8782)
* other out-of-bounds reads (CVE-2015-8783)
* potential out-of-bound write in NeXTDecode (CVE-2015-8784)
* tif_pixarlog.c has out-of-bounds write vulnerabilities in heap allocated
  buffers (CVE-2016-9533)
* tif_write.c has an issue in the error code path of TIFFFlushData1() that
  didn't reset the tif_rawcc and tif_rawcp members (CVE-2016-9534)
* tif_predict.h and tif_predict.c have assertions that can lead to assertion
  failures in debug mode, or buffer overflows in release mode, when dealing
  with unusual tile size like YCbCr with subsampling (CVE-2016-9535)