def audit(self, freq, orig_response, debugging_id):
"""
Searches for file upload vulns.
:param freq: A FuzzableRequest
:param orig_response: The HTTP response associated with the fuzzable request
:param debugging_id: A unique identifier for this call to audit()
"""
if freq.get_method().upper() != 'POST' or not freq.get_file_vars():
return
# Unique payload for the files we upload
payload = rand_alnum(239)
for file_parameter in freq.get_file_vars():
for extension in self._extensions:
_, file_content, file_name = get_template_with_payload(
extension, payload)
# Only file handlers are passed to the create_mutants functions
named_stringio = NamedStringIO(file_content, file_name)
mutants = create_mutants(freq, [named_stringio],
fuzzable_param_list=[file_parameter])
for mutant in mutants:
mutant.uploaded_file_name = file_name
mutant.extension = extension
mutant.file_content = file_content
mutant.file_payload = payload
self._send_mutants_in_threads(self._uri_opener.send_mutant,
mutants,
self._analyze_result,
debugging_id=debugging_id)
def build_file(self, value):
if isinstance(value, basestring):
_, file_content, fname = get_template_with_payload(self._extension,
value)
# I have to create the NamedStringIO with a "name",
# required for MultipartContainer to properly encode this as
# multipart/post
return NamedStringIO(file_content, name=fname)
return value
def build_file(self, value):
if isinstance(value, basestring):
_, file_content, fname = get_template_with_payload(
self._extension, value)
# I have to create the NamedStringIO with a "name",
# required for MultipartContainer to properly encode this as
# multipart/post
return NamedStringIO(file_content, name=fname)
return value
def build_file(self, value):
#
# We don't want to create a new file if value is already a NamedStringIO
# but if it is a string, we should create a new NamedStringIO instance
# and return it
#
# The last "not isinstance" is important due to the fact that
# NamedStringIO is a basestring subclass
#
if isinstance(value, basestring) and not isinstance(value, NamedStringIO):
_, file_content, fname = get_template_with_payload(self._extension,
value)
# I have to create the NamedStringIO with a "name",
# required for MultipartContainer to properly encode this as
# multipart/post
return NamedStringIO(file_content, name=fname)
return value
def test_generate_all(self):
fuzzer_config = {'fuzz_form_files': True,
'fuzzed_files_extension': 'gif'}
form_params = FormParameters()
form_params.set_method('POST')
form_params.set_action(self.url)
form_params.add_input([("name", "username"), ("value", "")])
form_params.add_input([("name", "address"), ("value", "")])
form_params.add_file_input([("name", "image"), ("type", "file")])
form = MultipartContainer(form_params)
freq = FuzzableRequest.from_form(form)
ph = 'w3af.core.data.constants.file_templates.file_templates.rand_alpha'
with patch(ph) as mock_rand_alpha:
mock_rand_alpha.return_value = 'upload'
generated_mutants = FileContentMutant.create_mutants(freq,
self.payloads,
[], False,
fuzzer_config)
self.assertEqual(len(generated_mutants), 2, generated_mutants)
_, file_payload_abc, _ = get_template_with_payload('gif', 'abc')
_, file_payload_def, _ = get_template_with_payload('gif', 'def')
file_abc = NamedStringIO(file_payload_abc, 'upload.gif')
file_def = NamedStringIO(file_payload_def, 'upload.gif')
form_1 = MultipartContainer(copy.deepcopy(form_params))
form_2 = MultipartContainer(copy.deepcopy(form_params))
form_1['image'] = [file_abc]
form_1['username'] = ['John8212']
form_1['address'] = ['Bonsai Street 123']
form_2['image'] = [file_def]
form_2['username'] = ['John8212']
form_2['address'] = ['Bonsai Street 123']
expected_forms = [form_1, form_2]
boundary = get_boundary()
noop = '1' * len(boundary)
expected_data = [encode_as_multipart(f, boundary) for f in expected_forms]
expected_data = set([s.replace(boundary, noop) for s in expected_data])
generated_forms = [m.get_dc() for m in generated_mutants]
generated_data = [str(f).replace(f.boundary, noop) for f in generated_forms]
self.assertEqual(expected_data, set(generated_data))
str_file = generated_forms[0]['image'][0].get_value()
self.assertIsInstance(str_file, NamedStringIO)
self.assertEqual(str_file.name[-4:], '.gif')
self.assertEqual(file_payload_abc, str_file)
str_file = generated_forms[1]['image'][0].get_value()
self.assertIsInstance(str_file, NamedStringIO)
self.assertEqual(str_file.name[-4:], '.gif')
self.assertEqual(file_payload_def, str_file)
self.assertIn('name="image"; filename="upload.gif"', generated_data[0])
def test_generate_all(self):
fuzzer_config = {
'fuzz_form_files': True,
'fuzzed_files_extension': 'gif'
}
form_params = FormParameters()
form_params.set_method('POST')
form_params.set_action(self.url)
form_params.add_field_by_attr_items([("name", "username"),
("value", "")])
form_params.add_field_by_attr_items([("name", "address"),
("value", "")])
form_params.add_field_by_attr_items([("name", "image"),
("type", "file")])
form = MultipartContainer(form_params)
freq = FuzzableRequest.from_form(form)
ph = 'w3af.core.data.constants.file_templates.file_templates.rand_alpha'
with patch(ph) as mock_rand_alpha:
mock_rand_alpha.return_value = 'upload'
generated_mutants = FileContentMutant.create_mutants(
freq, self.payloads, [], False, fuzzer_config)
self.assertEqual(len(generated_mutants), 2, generated_mutants)
_, file_payload_abc, _ = get_template_with_payload('gif', 'abc')
_, file_payload_def, _ = get_template_with_payload('gif', 'def')
file_abc = NamedStringIO(file_payload_abc, 'upload.gif')
file_def = NamedStringIO(file_payload_def, 'upload.gif')
form_1 = MultipartContainer(copy.deepcopy(form_params))
form_2 = MultipartContainer(copy.deepcopy(form_params))
form_1['image'] = [file_abc]
form_1['username'] = ['John8212']
form_1['address'] = ['Bonsai Street 123']
form_2['image'] = [file_def]
form_2['username'] = ['John8212']
form_2['address'] = ['Bonsai Street 123']
expected_forms = [form_1, form_2]
boundary = get_boundary()
noop = '1' * len(boundary)
expected_data = [
encode_as_multipart(f, boundary) for f in expected_forms
]
expected_data = set([s.replace(boundary, noop) for s in expected_data])
generated_forms = [m.get_dc() for m in generated_mutants]
generated_data = [
str(f).replace(f.boundary, noop) for f in generated_forms
]
self.assertEqual(expected_data, set(generated_data))
str_file = generated_forms[0]['image'][0].get_value()
self.assertIsInstance(str_file, NamedStringIO)
self.assertEqual(str_file.name[-4:], '.gif')
self.assertEqual(file_payload_abc, str_file)
str_file = generated_forms[1]['image'][0].get_value()
self.assertIsInstance(str_file, NamedStringIO)
self.assertEqual(str_file.name[-4:], '.gif')
self.assertEqual(file_payload_def, str_file)
self.assertIn('name="image"; filename="upload.gif"', generated_data[0])
