xloadimage -- buffer overflows in NIFF image title handling

Ariel Berkman reports:

Unlike most of the supported image formats in xloadimage,
the NIFF image format can store a title name of arbitrary
length as part of the image file.
When xloadimage is processing a loaded image, it is
creating a new Image object and then writing the processed
image to it. At that point, it will also copy the title
from the old image to the newly created image.
The ‘zoom’, ‘reduce’, and ‘rotate’ functions are using
a fixed length buffer to construct the new title name
when an image processing is done. Since the title name
in a NIFF format is of varying length, and there are
insufficient buffer size validations, the buffer can
be overflowed.