[SECURITY] Use defusedcsv for exports

src/pretix/base/exporters/orderlist.py

@@ -1,9 +1,9 @@
-import csv
 import io
 from collections import OrderedDict
 from decimal import Decimal
 
 import pytz
+from defusedcsv import csv
 from django import forms
 from django.db.models import Sum
 from django.dispatch import receiver

src/pretix/control/views/vouchers.py

@@ -1,6 +1,6 @@
-import csv
 import io
 
+from defusedcsv import csv
 from django.conf import settings
 from django.contrib import messages
 from django.core.urlresolvers import resolve, reverse

src/pretix/plugins/checkinlists/exporters.py

@@ -1,7 +1,7 @@
-import csv
 import io
 from collections import OrderedDict
 
+from defusedcsv import csv
 from django import forms
 from django.db.models.functions import Coalesce
 from django.utils.translation import ugettext as _, ugettext_lazy

src/requirements/production.txt

@@ -39,3 +39,4 @@ chardet<3.1.0,>=3.0.2
 mt-940==3.2
 vobject==0.9.*
 pycountry
+defusedcsv>=1.0.1

src/setup.py

@@ -100,7 +100,8 @@ setup(
         'mt-940==4.7',
         'django-i18nfield>=1.0.1',
         'vobject==0.9.*',
-        'pycountry'
+        'pycountry',
+        'defusedcsv'
     ],
     extras_require={
         'dev': [