libtiff: out-of-bounds write in _TIFFmemcpy() in libtiff/tif_unix.c when called by functions in tools/tiffcrop.c

A flaw was found in tiffcrop, a program distributed by the libtiff package. A specially crafted tiff file can lead to an out-of-bounds write in the TIFFmemcpy function in libtiff/tifunix.c when called by functions in tools/tiffcrop.c, resulting in a Denial of Service and limited data modification...