mirror of https://github.com/MISP/misp-modules
137 lines
6.6 KiB
Python
137 lines
6.6 KiB
Python
from collections import defaultdict
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from pymisp import MISPEvent, MISPObject
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import json
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import requests
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misperrors = {'error': 'Error'}
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mispattributes = {'input': ['vulnerability'], 'format': 'misp_standard'}
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moduleinfo = {'version': '1', 'author': 'Christian Studer',
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'description': 'An expansion module to enrich a CVE attribute with the vulnerability information.',
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'module-type': ['expansion', 'hover']}
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moduleconfig = ["custom_API"]
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cveapi_url = 'https://cve.circl.lu/api/cve/'
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class VulnerabilityParser():
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def __init__(self, attribute, vulnerability, api_url):
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self.attribute = attribute
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self.vulnerability = vulnerability
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self.api_url = api_url
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self.misp_event = MISPEvent()
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self.misp_event.add_attribute(**attribute)
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self.references = defaultdict(list)
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self.capec_features = ('id', 'name', 'summary', 'prerequisites', 'solutions')
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self.vulnerability_mapping = {
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'id': ('text', 'id'), 'summary': ('text', 'summary'),
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'vulnerable_configuration': ('text', 'vulnerable_configuration'),
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'vulnerable_configuration_cpe_2_2': ('text', 'vulnerable_configuration'),
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'Modified': ('datetime', 'modified'), 'Published': ('datetime', 'published'),
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'references': ('link', 'references'), 'cvss': ('float', 'cvss-score')}
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self.weakness_mapping = {'name': 'name', 'description_summary': 'description',
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'status': 'status', 'weaknessabs': 'weakness-abs'}
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def get_result(self):
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if self.references:
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self.__build_references()
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event = json.loads(self.misp_event.to_json())
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results = {key: event[key] for key in ('Attribute', 'Object') if (key in event and event[key])}
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return {'results': results}
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def parse_vulnerability_information(self):
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vulnerability_object = MISPObject('vulnerability')
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for feature in ('id', 'summary', 'Modified', 'cvss'):
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value = self.vulnerability.get(feature)
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if value:
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attribute_type, relation = self.vulnerability_mapping[feature]
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vulnerability_object.add_attribute(relation, **{'type': attribute_type, 'value': value})
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if 'Published' in self.vulnerability:
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vulnerability_object.add_attribute('published', **{'type': 'datetime', 'value': self.vulnerability['Published']})
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vulnerability_object.add_attribute('state', **{'type': 'text', 'value': 'Published'})
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for feature in ('references', 'vulnerable_configuration', 'vulnerable_configuration_cpe_2_2'):
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if feature in self.vulnerability:
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attribute_type, relation = self.vulnerability_mapping[feature]
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for value in self.vulnerability[feature]:
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if isinstance(value, dict):
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value = value['title']
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vulnerability_object.add_attribute(relation, **{'type': attribute_type, 'value': value})
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vulnerability_object.add_reference(self.attribute['uuid'], 'related-to')
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self.misp_event.add_object(**vulnerability_object)
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if 'cwe' in self.vulnerability and self.vulnerability['cwe'] not in ('Unknown', 'NVD-CWE-noinfo'):
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self.__parse_weakness(vulnerability_object.uuid)
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if 'capec' in self.vulnerability:
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self.__parse_capec(vulnerability_object.uuid)
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def __build_references(self):
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for object_uuid, references in self.references.items():
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for misp_object in self.misp_event.objects:
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if misp_object.uuid == object_uuid:
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for reference in references:
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misp_object.add_reference(**reference)
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break
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def __parse_capec(self, vulnerability_uuid):
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attribute_type = 'text'
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for capec in self.vulnerability['capec']:
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capec_object = MISPObject('attack-pattern')
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for feature in self.capec_features:
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capec_object.add_attribute(feature, **dict(type=attribute_type, value=capec[feature]))
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for related_weakness in capec['related_weakness']:
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attribute = dict(type='weakness', value="CWE-{}".format(related_weakness))
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capec_object.add_attribute('related-weakness', **attribute)
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self.misp_event.add_object(**capec_object)
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self.references[vulnerability_uuid].append(dict(referenced_uuid=capec_object.uuid,
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relationship_type='targeted-by'))
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def __parse_weakness(self, vulnerability_uuid):
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attribute_type = 'text'
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cwe_string, cwe_id = self.vulnerability['cwe'].split('-')
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cwes = requests.get(self.api_url.replace('/cve/', '/cwe'))
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if cwes.status_code == 200:
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for cwe in cwes.json():
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if cwe['id'] == cwe_id:
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weakness_object = MISPObject('weakness')
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weakness_object.add_attribute('id', **dict(type=attribute_type, value='-'.join([cwe_string, cwe_id])))
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for feature, relation in self.weakness_mapping.items():
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if cwe.get(feature):
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weakness_object.add_attribute(relation, **dict(type=attribute_type, value=cwe[feature]))
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self.misp_event.add_object(**weakness_object)
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self.references[vulnerability_uuid].append(dict(referenced_uuid=weakness_object.uuid,
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relationship_type='weakened-by'))
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break
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def check_url(url):
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return "{}/".format(url) if not url.endswith('/') else url
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def handler(q=False):
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if q is False:
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return False
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request = json.loads(q)
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attribute = request.get('attribute')
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if attribute.get('type') != 'vulnerability':
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misperrors['error'] = 'Vulnerability id missing.'
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return misperrors
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api_url = check_url(request['config']['custom_API']) if request['config'].get('custom_API') else cveapi_url
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r = requests.get("{}{}".format(api_url, attribute['value']))
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if r.status_code == 200:
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vulnerability = r.json()
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if not vulnerability:
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misperrors['error'] = 'Non existing CVE'
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return misperrors['error']
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else:
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misperrors['error'] = 'API not accessible'
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return misperrors['error']
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parser = VulnerabilityParser(attribute, vulnerability, api_url)
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parser.parse_vulnerability_information()
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return parser.get_result()
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def introspection():
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return mispattributes
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def version():
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moduleinfo['config'] = moduleconfig
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return moduleinfo
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