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annotate farolluz/parsers/cve.py @ 43:b87f2a6e613a

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Add CVE parsing (from OpenVAS GSA)
author Benoît Allard <benoit.allard@greenbone.net>
date Mon, 29 Dec 2014 16:33:34 +0100
parents
children b7e64d0a3a7c
rev   line source
43
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1 # -*- coding: utf-8 -*-
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2 # Description:
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3 # Methods for parsing CVE XML documents
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4 #
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5 # Authors:
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6 # Benoît Allard <benoit.allard@greenbone.net>
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7 #
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8 # Copyright:
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9 # Copyright (C) 2014 Greenbone Networks GmbH
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10 #
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11 # This program is free software; you can redistribute it and/or
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12 # modify it under the terms of the GNU General Public License
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13 # as published by the Free Software Foundation; either version 2
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14 # of the License, or (at your option) any later version.
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15 #
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16 # This program is distributed in the hope that it will be useful,
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17 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 # GNU General Public License for more details.
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20 #
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21 # You should have received a copy of the GNU General Public License
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22 # along with this program; if not, write to the Free Software
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23 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24
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25 """\
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26 Methods for parsing of CVE XML Documents
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27
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28 Ref: http://scap.nist.gov/schema/vulnerability/0.4
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29 """
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30
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31 from __future__ import absolute_import
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32
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33 import xml.etree.ElementTree as ET
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34
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35 from .xml import parseDate
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36
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37 from ..common import CVRFNote, CVRFReference
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38 from ..document import CVRF, CVRFPublisher, CVRFTracking, CVRFTrackingID, CVRFRevision
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39 from ..producttree import CVRFFullProductName
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40 from ..utils import utcnow
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41 from ..vulnerability import CVRFVulnerability, CVRFCVSSSet, CVRFCWE, CVRFProductStatus
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42
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43 NAMESPACES = {
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44 'cve': "http://scap.nist.gov/schema/feed/vulnerability/2.0",
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45 'vuln': "http://scap.nist.gov/schema/vulnerability/0.4",
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46 'cvss': "http://scap.nist.gov/schema/cvss-v2/0.2",
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47 'xml': "http://www.w3.org/XML/1998/namespace",
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48 }
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49
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50
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51 def UN(ns, name):
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52 """ returns a Universal Name """
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53 return "{%s}%s" % (NAMESPACES[ns], name)
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54
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55 def parseCVSS(xmlElem):
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56 """ Make a vector out of a list of elements """
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57 def get(name):
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58 return xmlElem.findtext('/'.join([UN('cvss', 'base_metrics'), UN('cvss', name)]))
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59
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60 cvss_set = CVRFCVSSSet(float(get('score')))
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61 vector = [
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62 'AV:%s' % {'LOCAL': 'L',
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63 'ADJACENT_NETWORK': 'A',
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64 'NETWORK': 'N'}[get('access-vector')],
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65 'AC:%s' % {'HIGH': 'H',
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66 'MEDIUM': 'M',
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67 'LOW': 'L'}[get('access-complexity')],
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68 'Au:%s' % {'MULTIPLE': 'M',
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69 'SINGLE': 'S',
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70 'NONE': 'N'}[get('authentication')],
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71 'C:%s' % {'NONE': 'N',
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72 'PARTIAL': 'P',
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73 'COMPLETE': 'C'}[get('confidentiality-impact')],
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74 'I:%s' % {'NONE': 'N',
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75 'PARTIAL': 'P',
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76 'COMPLETE': 'C'}[get('integrity-impact')],
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77 'A:%s' % {'NONE': 'N',
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78 'PARTIAL': 'P',
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79 'COMPLETE': 'C'}[get('availability-impact')],
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80 ]
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81 cvss_set.setVector('/'.join(vector))
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82 return cvss_set
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83
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84 def parseXML(data):
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85 """ returns am ET.Element from the input stuff.
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86 input can be:
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87 - a string
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88 - a file handle
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89 - an ET.Element instance
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90 """
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91 if isinstance(data, ET.Element):
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92 return data
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93 # To allow passing file handles
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94 if hasattr(data, 'read'):
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95 data = data.read()
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96 # Parse it.
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97 return ET.fromstring(data)
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98
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99 def parse_CVE_from_GSA(data):
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100 xml = parseXML(data)
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101 return parse(xml.find('/'.join(['get_info', 'get_info_response', 'info', 'cve', 'raw_data', UN('cve', 'entry')])))
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102
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103 def parse(xml):
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104 xml = parseXML(xml)
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105
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106 # Create an extra-minimal document
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107 doc = CVRF(xml.findtext(UN('vuln', 'cve-id')),
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108 'Vulnerability Description')
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109 pub = CVRFPublisher("Other")
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110 doc.setPublisher(pub)
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111 now = utcnow()
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112 tracking = CVRFTracking(
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113 CVRFTrackingID('000000'),
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114 "Draft",
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115 (0,),
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116 now, now
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117 )
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118 doc.setTracking(tracking)
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119 tracking.addRevision(CVRFRevision((0,), now, 'Document created'))
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120
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121 # Add the CVE to that document
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122 return addToDoc(doc, xml)
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123
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124 def addToDoc(doc, xml):
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125 """ Adds the CVE as vulnerability in the document """
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126 xml = parseXML(xml)
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127
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128 vulnid = xml.attrib['id']
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129
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130 # Get a new ordinal for our new Vulnerability
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131 if len(doc._vulnerabilities) == 0:
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132 ordinal = 1
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133 else:
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134 ordinal = doc._vulnerabilities[-1]._ordinal + 1
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135
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136 # Create a Vulnerability
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137 vuln = CVRFVulnerability(ordinal)
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138 doc.addVulnerability(vuln)
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139
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140 vulnerable_products = []
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141 # Set the vulnerable products in productTree
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142 for i, cpe in enumerate(xml.findall(
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143 '/'.join([UN('vuln', 'vulnerable-software-list'),
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144 UN('vuln', 'product')]))):
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145 if doc._producttree is None:
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146 doc.createProductTree()
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147 try:
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148 prod = doc._producttree.getProductForCPE(cpe.text)
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149 except KeyError:
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150 prod = CVRFFullProductName('%s-P%d' % (vulnid, i), cpe.text, doc._producttree, cpe.text)
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151 doc._producttree.addProduct(prod)
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152 vulnerable_products.append(prod)
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153
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154 if vulnerable_products:
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155 status = CVRFProductStatus('Known Affected')
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156 for product in vulnerable_products:
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157 status.addProductID(product._productid)
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158 vuln.addProductStatus(status)
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159
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160 # Add the CVE-id
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161 vuln.setCVE(xml.findtext(UN('vuln', 'cve-id')))
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162
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163 # The release date
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164 vuln.setReleaseDate(parseDate(xml.findtext(UN('vuln', 'published-datetime'))))
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165
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166 # Add the CVSS
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167 xmlcvss = xml.find(UN('vuln', 'cvss'))
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168 if xmlcvss is not None:
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169 vuln.addCVSSSet(parseCVSS(xmlcvss))
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170
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171 # Add the CWE id
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172 xmlcwe = xml.find(UN('vuln', 'cwe'))
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173 if xmlcwe is not None:
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174 # XXX: Get a Description for the CWE !
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175 vuln.addCWE(CVRFCWE(xmlcwe.attrib['id'], xmlcwe.attrib['id']))
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176
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177 # Add references
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178 for xmlref in xml.findall(UN('vuln', 'references')):
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179 vuln.addReference(CVRFReference(xmlref.find(UN('vuln','reference')).attrib['href'],
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180 xmlref.findtext(UN('vuln', 'reference'))))
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181
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182 xmlsummary = xml.findtext(UN('vuln', 'summary'))
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183 if xmlsummary is not None:
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184 vuln.addNote(CVRFNote(
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185 'Summary',
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186 1,
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187 xmlsummary
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188 ))
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189
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190 return doc
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