111 lines
4.5 KiB
Python
111 lines
4.5 KiB
Python
# Copyright 2015 Rackspace
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_config import cfg
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import syntribos
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from syntribos.checks import has_string as has_string
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from syntribos.checks import time_diff as time_diff
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from syntribos.clients.http import parser
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from syntribos.tests.fuzz import base_fuzz
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import syntribos.tests.fuzz.datagen
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CONF = cfg.CONF
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class XMLExternalEntityBody(base_fuzz.BaseFuzzTestCase):
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"""Test for XML-external-entity injection vulnerabilities in HTTP body."""
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test_name = "XML_EXTERNAL_ENTITY_BODY"
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parameter_location = "data"
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dtds_data_key = "xml-external.txt"
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failure_keys = [
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'root:',
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'root@',
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'daemon:',
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'sys:',
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'[boot loader]',
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'[operating systems]',
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'multi(0)',
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'disk(0)',
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'partition']
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@classmethod
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def get_test_cases(cls, filename, file_content, meta_vars):
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"""Makes sure API call supports XML
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Overrides parent fuzz test generation, if API method does not support
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XML, do not generate tests.
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"""
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# Send request for different content-types
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request_obj = parser.create_request(
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file_content, CONF.syntribos.endpoint, meta_vars)
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prepared_copy = request_obj.get_prepared_copy()
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prepared_copy.headers['content-type'] = "application/json"
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prepared_copy_xml = prepared_copy.get_prepared_copy()
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prepared_copy_xml.headers['content-type'] = "application/xml"
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init_response, init_signals = cls.client.send_request(prepared_copy)
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_, xml_signals = cls.client.send_request(
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prepared_copy_xml)
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cls.init_resp = init_response
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cls.init_signals = init_signals
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if ("HTTP_CONTENT_TYPE_XML" not in init_signals and
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"HTTP_CONTENT_TYPE_XML" not in xml_signals):
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return
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# iterate through permutations of doctype declarations and fuzz fields
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dtds = cls._get_strings(cls.dtds_data_key)
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for d_num, dtd in enumerate(dtds):
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prefix_name = "{filename}_{test_name}_{fuzz_file}{d_index}_"
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prefix_name = prefix_name.format(
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filename=filename, test_name=cls.test_name,
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fuzz_file=cls.dtds_data_key, d_index=d_num)
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fr = syntribos.tests.fuzz.datagen.fuzz_request(
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request_obj, ["&xxe;"], cls.parameter_location, prefix_name)
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for fuzz_name, request, fuzz_string, param_path in fr:
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request.data = "{0}\n{1}".format(dtd, request.data)
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yield cls.extend_class(fuzz_name, fuzz_string, param_path,
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{"request": request})
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def test_case(self):
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self.run_default_checks()
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self.test_signals.register(has_string(self))
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if "FAILURE_KEYS_PRESENT" in self.test_signals:
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failed_strings = self.test_signals.find(
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slugs="FAILURE_KEYS_PRESENT")[0].data["failed_strings"]
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self.register_issue(
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defect_type="xml_strings",
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severity=syntribos.MEDIUM,
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confidence=syntribos.LOW,
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description=("The string(s): '{0}', known to be commonly "
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"returned after a successful XML external entity "
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"attack, have been found in the response. This "
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"could indicate a vulnerability to XML external "
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"entity attacks.").format(failed_strings))
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self.diff_signals.register(time_diff(self))
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if "TIME_DIFF_OVER" in self.diff_signals:
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self.register_issue(
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defect_type="xml_timing",
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severity=syntribos.MEDIUM,
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confidence=syntribos.LOW,
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description=("The time it took to resolve a request with an "
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"invalid URL in the DTD takes too long compared "
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"to the baseline request. This could reflect a "
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"vulnerability to an XML external entity attack.")
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)
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