mirror of https://github.com/MISP/misp-modules
chg: [cve_advanced] Updated the module to use cvepremium & a few improvements
Christian Studer
parent
38a6dc810e
commit
8e97bf9938
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@ -2,34 +2,70 @@ import json
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import requests
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from . import check_input_attribute, standard_error_message
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from collections import defaultdict
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from pymisp import MISPEvent, MISPObject
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from pymisp import MISPAttribute, MISPEvent, MISPObject
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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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moduleinfo = {'version': '2', '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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cveapi_url = 'https://cvepremium.circl.lu/api/'
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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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def __init__(self, attribute, api_url):
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misp_attribute = MISPAttribute()
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misp_attribute.from_dict(**attribute)
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misp_event = MISPEvent()
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misp_event.add_attribute(**misp_attribute)
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self.__misp_attribute = misp_attribute
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self.__misp_event = misp_event
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self.__api_url = api_url
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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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self.__capec_features = ('id', 'name', 'summary', 'prerequisites', 'solutions')
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self.__vulnerability_mapping = {
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'id': 'id', 'summary': 'summary',
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'Modified': 'modified', 'cvss3': 'cvss-score',
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'cvss3-vector': 'cvss-string'
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}
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self.__vulnerability_multiple_mapping = {
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'vulnerable_configuration': 'vulnerable-configuration',
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'vulnerable_configuration_cpe_2_2': 'vulnerable-configuration',
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'Modified': 'modified', 'Published': 'published',
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'references': 'references', 'cvss': '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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'references': 'references'
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}
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self.__weakness_mapping = {
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'name': 'name', 'description_summary': 'description',
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'status': 'status', 'weaknessabs': 'weakness-abs'
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}
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@property
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def api_url(self) -> str:
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return self.__api_url
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@property
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def capec_features(self) -> tuple:
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return self.__capec_features
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@property
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def misp_attribute(self) -> MISPAttribute:
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return self.__misp_attribute
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@property
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def misp_event(self) -> MISPEvent:
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return self.__misp_event
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@property
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def vulnerability_mapping(self) -> dict:
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return self.__vulnerability_mapping
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@property
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def vulnerability_multiple_mapping(self) -> dict:
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return self.__vulnerability_multiple_mapping
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@property
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def weakness_mapping(self) -> dict:
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return self.__weakness_mapping
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def get_result(self):
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if self.references:
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@ -38,28 +74,26 @@ class VulnerabilityParser():
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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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def parse_vulnerability_information(self, vulnerability):
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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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vulnerability_object.add_attribute(self.vulnerability_mapping[feature], value)
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if 'Published' in self.vulnerability:
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vulnerability_object.add_attribute('published', self.vulnerability['Published'])
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for feature, relation in self.vulnerability_mapping.items():
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if vulnerability.get(feature):
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vulnerability_object.add_attribute(relation, vulnerability[feature])
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if 'Published' in vulnerability:
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vulnerability_object.add_attribute('published', vulnerability['Published'])
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vulnerability_object.add_attribute('state', '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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relation = self.vulnerability_mapping[feature]
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for value in self.vulnerability[feature]:
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for feature, relation in self.vulnerability_multiple_mapping.items():
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if feature in vulnerability:
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for value in 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, value)
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vulnerability_object.add_reference(self.attribute['uuid'], 'related-to')
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vulnerability_object.add_reference(self.misp_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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if 'cwe' in vulnerability and vulnerability['cwe'] not in ('Unknown', 'NVD-CWE-noinfo'):
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self.__parse_weakness(vulnerability['cwe'], vulnerability_object.uuid)
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if 'capec' in vulnerability:
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self.__parse_capec(vulnerability['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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@ -69,8 +103,8 @@ class VulnerabilityParser():
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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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for capec in self.vulnerability['capec']:
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def __parse_capec(self, capec_values, vulnerability_uuid):
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for capec in capec_values:
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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, capec[feature])
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@ -84,29 +118,27 @@ class VulnerabilityParser():
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}
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)
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def __parse_weakness(self, vulnerability_uuid):
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cwe_string, cwe_id = self.vulnerability['cwe'].split('-')[:2]
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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', f'{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, cwe[feature])
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self.misp_event.add_object(weakness_object)
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self.references[vulnerability_uuid].append(
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{
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'referenced_uuid': weakness_object.uuid,
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'relationship_type': 'weakened-by'
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}
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)
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break
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def __parse_weakness(self, cwe_value, vulnerability_uuid):
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cwe_string, cwe_id = cwe_value.split('-')[:2]
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cwe = requests.get(f'{self.api_url}cwe/{cwe_id}')
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if cwe.status_code == 200:
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cwe = cwe.json()
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weakness_object = MISPObject('weakness')
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weakness_object.add_attribute('id', f'{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, cwe[feature])
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self.misp_event.add_object(weakness_object)
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self.references[vulnerability_uuid].append(
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{
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'referenced_uuid': weakness_object.uuid,
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'relationship_type': 'weakened-by'
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}
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)
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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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return f"{url}/" if not url.endswith('/') else url
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def handler(q=False):
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@ -119,8 +151,8 @@ def handler(q=False):
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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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api_url = check_url(request['config']['custom_API']) if request.get('config', {}).get('custom_API') else cveapi_url
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r = requests.get(f"{api_url}cve/{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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@ -129,8 +161,8 @@ def handler(q=False):
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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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parser = VulnerabilityParser(attribute, api_url)
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parser.parse_vulnerability_information(vulnerability)
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return parser.get_result()
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