The remote host is missing an update to tiff announced via advisory USN-54-1.
Dmitry V. Levin discovered a buffer overflow in the 'tiffdump' utility. If an attacker tricked a user into processing a malicious TIFF image with tiffdump, they could cause a buffer overflow which at least causes the program to crash. However, it is not entirely clear whether this can be exploited to execute arbitrary code with the privileges of the user opening the image.
The following packages are affected: libtiff-tools
Solution: The problem can be corrected by upgrading the affected package to version 3.6.1-1.1ubuntu1.2. In general, a standard system upgrade is sufficient to effect the necessary changes.