libtiff: Heap-buffer overflow due to TileSize calculation when parsing tiff files

Multiple integer overflows in tiffgetimage.c in LibTIFF 3.9.4 allow remote attackers to execute arbitrary code via a crafted tile size in a TIFF file, which is not properly handled by the 1 gtTileSeparate or 2 gtStripSeparate function, leading to a heap-based buffer overflow...