tiff - security update

The libtiff library and associated tools provided in libtiff-tools are
vulnerable to many security problems.

This update drops many tools which are no longer supported upstream
and which are affected by multiple memory corruption issues:

• bmp2tiff (CVE-2016-3619,
  CVE-2016-3620,
  CVE-2016-3621,
  CVE-2016-5319,
  CVE-2015-8668)
• gif2tiff (CVE-2016-3186,
  CVE-2016-5102)
• ras2tiff
• sgi2tiff
• sgisv
• ycbcr
• rgb2ycbcr (CVE-2016-3623,
  CVE-2016-3624)
• thumbnail (CVE-2016-3631,
  CVE-2016-3632,
  CVE-2016-3633,
  CVE-2016-3634,
  CVE-2016-8331)

This update also fixes the following issues:

• CVE-2014-8128 /
  CVE-2015-7554,
  CVE-2016-5318
  Multiple buffer overflows triggered through TIFFGetField() on unknown
  tags. Lacking an upstream fix, the list of known tags has been
  extended to cover all those that are in use by the TIFF tools.
• CVE-2016-5652
  Heap based buffer overflow in tiff2pdf.
• CVE-2016-6223
  Information leak in libtiff/tif_read.c. Fix out-of-bounds read on
  memory-mapped files in TIFFReadRawStrip1() and TIFFReadRawTile1()
  when stripoffset is beyond tmsize_t max value (reported by
  Mathias Svensson).

For Debian 7 Wheezy, these problems have been fixed in version
4.0.2-6+deb7u7.

We recommend that you upgrade your tiff packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;