Crash PIL with single bit TIFF

crash-pil.py

# -*- coding: utf-8 -*
from __future__ import print_function, absolute_import, unicode_literals

import six
from PIL import Image
from django.core.files.uploadedfile import SimpleUploadedFile

Image.DEBUG = True

with open("/Users/andrew/Desktop/sample.tiff", 'rb') as f:
    uploaded_file = SimpleUploadedFile("sample.tiff", f.read())

img = Image.open(uploaded_file)
img.thumbnail((2000, 2000))

img_io = six.BytesIO()
img.save(img_io, format="PNG", optimize=True)
img_io.seek(0)

f = open("/Users/andrew/Desktop/sample.png", "w")
f.write(img_io.read())
f.close()