Class: Watobo::Modules::Active::Xss::Xss_ng

Inherits:
ActiveCheck
  • Object
show all
Defined in:
modules/active/xss/xss_ng.rb

Constant Summary

Constants included from Constants

Constants::AC_GROUP_APACHE, Constants::AC_GROUP_DOMINO, Constants::AC_GROUP_ENUMERATION, Constants::AC_GROUP_FILE_INCLUSION, Constants::AC_GROUP_FLASH, Constants::AC_GROUP_GENERIC, Constants::AC_GROUP_JBOSS, Constants::AC_GROUP_JOOMLA, Constants::AC_GROUP_SAP, Constants::AC_GROUP_SQL, Constants::AC_GROUP_TYPO3, Constants::AC_GROUP_XSS, Constants::AUTH_TYPE_BASIC, Constants::AUTH_TYPE_DIGEST, Constants::AUTH_TYPE_NONE, Constants::AUTH_TYPE_NTLM, Constants::CHAT_SOURCE_AUTO_SCAN, Constants::CHAT_SOURCE_FUZZER, Constants::CHAT_SOURCE_INTERCEPT, Constants::CHAT_SOURCE_MANUAL, Constants::CHAT_SOURCE_MANUAL_SCAN, Constants::CHAT_SOURCE_PROXY, Constants::CHAT_SOURCE_UNDEF, Constants::DEFAULT_PORT_HTTP, Constants::DEFAULT_PORT_HTTPS, Constants::FINDING_TYPE_HINT, Constants::FINDING_TYPE_INFO, Constants::FINDING_TYPE_UNDEFINED, Constants::FINDING_TYPE_VULN, Constants::FIRST_TIME_FILE, Constants::GUI_REGULAR_FONT_SIZE, Constants::GUI_SMALL_FONT_SIZE, Constants::ICON_PATH, Constants::LOG_DEBUG, Constants::LOG_INFO, Constants::SCAN_CANCELED, Constants::SCAN_FINISHED, Constants::SCAN_PAUSED, Constants::SCAN_STARTED, Constants::TE_CHUNKED, Constants::TE_COMPRESS, Constants::TE_DEFLATE, Constants::TE_GZIP, Constants::TE_IDENTITY, Constants::TE_NONE, Constants::VULN_RATING_CRITICAL, Constants::VULN_RATING_HIGH, Constants::VULN_RATING_INFO, Constants::VULN_RATING_LOW, Constants::VULN_RATING_MEDIUM, Constants::VULN_RATING_UNDEFINED

Instance Method Summary collapse

Methods included from CheckInfoMixin::InfoMethods

#check_group, #check_name

Constructor Details

#initialize(project, prefs = {}) ⇒ Xss_ng

Returns a new instance of Xss_ng.



65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
 
# File 'modules/active/xss/xss_ng.rb', line 65

def initialize(project, prefs={})
  super(project, prefs)
  
  
  @envelop = "watobo"
  @env_count = 0
  @evasions = [ "%0a", "%00"]
  @xss_chars= %w( < > ' " ) 
  @escape_chars = ['\\']       
  @additional_parms = []
  
  def reset
    @additional_parms = []
    @env_count = 0
  end
  
  
end

Instance Method Details

#generateChecks(chat) ⇒ Object 



85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
 
# File 'modules/active/xss/xss_ng.rb', line 85

def generateChecks(chat)    
  begin   
    # 
    if chat.response.respond_to? :input_fields           
    chat.response.input_fields do |field|                
      @additional_parms << field.to_www_form_parm if chat.request.method_post?
      @additional_parms << field.to_url_parm
     
    end
    end
    
    @parm_list = chat.request.parameters(:data, :url)
    @parm_list.concat @additional_parms
    @parm_list.each do |parm|
     #log_console( "#{parm.location} - #{parm.name} = #{parm.value}")
     
      checks = []
      @xss_chars.each do |xss|
        @env_count += 1
        
        check_id = "#{@envelop}#{@env_count}"
         checks << [ xss.dup, "#{xss}", check_id ]
         checks << [xss.dup, "#{parm.value}#{xss}", check_id ]
         checks << [xss.dup, "#{xss}#{parm.value}", check_id ]
            
        end
        checker = proc {
          results = {}
          rating = 0
             test_request = nil
            test_response = nil
            
            # first we check, if parameter is injectable
            test = chat.copyRequest
           
            proof = "INJ#{Time.now.to_i.to_s}"
            parm.value = proof
            test.set parm
            
            test_request,test_response = doRequest(test)
            
            
            next [ test_request, test_response ] unless test_response.has_body?
                             
            next [ test_request, test_response ] unless test_response.body =~ /#{proof}/i
            
          
          checks.each do |xss, check, check_id|
           
           # accept only one (escape) char between check_id and check string
            proof = "#{check_id}([^#{Regexp.quote(check)}]?(#{Regexp.quote(check)}){1})"
            next if results.has_key? xss
            test = chat.copyRequest
           
            parm.value = check_id + CGI.escape(check)
            test.set parm
            
            test_request,test_response = doRequest(test)
                             
            if not test_response then
              if $DEBUG
              puts "[#{Module.nesting[0].name}] got no response :("
              puts test
              end
            elsif test_response.join =~ /#{proof}/i
              match = $1
            #puts "MATCH: [ #{match} ] / [ #{check} ]"
              if match == check
              results[xss] = { :match => :full, :check => check, :proof => proof }
              end
              
              unless results.has_key? xss
                @escape_chars.each do |ec|
                  ep = Regexp.quote("#{ec}#{xss}")
                #  puts "Escaped: #{match} / #{ep}"
                  results[xss] = { :match => :escaped, :check => check, :proof => proof, :escape_char => "#{ec}"} if match =~ /#{ep}/
                end
              end
              
            end
            
          end
          
         puts results.to_yaml if $DEBUG
          xss_combo = ""
          combo_patterns = []
         results.each do |k,v|
           mp = CGI.escape(k)
           rp = CGI.escape(@xss_chars.join)
           xss_combo += CGI.escape(k)
           #puts "[#{k}] - #{v}"
           case v[:match]
             
           when :full
               rating += 100/@xss_chars.length                         
               combo_patterns << k 
             when :escaped
                rating += 100/(@xss_chars.length*4)
                combo_patterns << Regexp.quote("#{v[:escape_char]}#{k}") 
             end
         end                   
          
          if rating > 0
            test = chat.copyRequest
            #puts "COMBO-REQUEST: #{xss_combo}"
            parm.value = "#{@envelop}#{@env_count}#{xss_combo}"
            pattern = "(#{@envelop}#{@env_count}(#{combo_patterns.join("|")})+)"
            test.set parm
              
            match = ""
            
            test_request,test_response = doRequest(test)
            if not test_response then
              puts "got no response :("
            elsif test_response.join =~ /#{pattern}/i
              match = $1
              #puts "MATCH: #{match}"
            end
           
           fclass = "Reflected XSS - #{rating}%"
           fclass = "Reflected XSS (POST) - #{rating}%" if parm.location == :data
            addFinding( test_request, test_response,
                       :check_pattern => xss_combo, 
            :proof_pattern => "#{match}", 
            :test_item => parm.name,
            :class => fclass, 
            :chat => chat,
            :title => "[#{parm.name}] - #{test_request.path}"
            )
          end
         
          [ test_request, test_response ]
        }
        yield checker
     
    end
    
  rescue => bang
    puts bang
    puts bang.backtrace if $DEBUG
    puts "ERROR!! #{Module.nesting[0].name}"
    raise
    
    
  end
end

#reset ⇒ Object 



76
77
78
79
 
# File 'modules/active/xss/xss_ng.rb', line 76

def reset
  @additional_parms = []
  @env_count = 0
end