In LibTIFF 4.0.8, there is a assertion abort in the TIFFWriteDirectoryTagCheckedLong8Array function in tif_dirwrite.c. A crafted input will lead to a remote denial of service attack.
https://www.exploit-db.com/exploits/42299/
https://usn.ubuntu.com/3602-1/
http://www.securityfocus.com/bid/99359