/usr/share/w3af/plugins/evasion/fullWidthEncode.py is in w3af-console 1.1svn5547-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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fullWidthEncode.py
Copyright 2006 Andres Riancho
This file is part of w3af, w3af.sourceforge.net .
w3af is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation version 2 of the License.
w3af is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with w3af; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
'''
from core.controllers.basePlugin.baseEvasionPlugin import baseEvasionPlugin
from core.controllers.w3afException import w3afException
from core.data.url.HTTPRequest import HTTPRequest as HTTPRequest
from core.data.parsers.urlParser import parse_qs
# options
from core.data.options.option import option
from core.data.options.optionList import optionList
import urllib
class fullWidthEncode(baseEvasionPlugin):
'''
Evade detection using full width encoding.
@author: Andres Riancho ( andres.riancho@gmail.com )
'''
def __init__(self):
baseEvasionPlugin.__init__(self)
def modifyRequest(self, request ):
'''
Mangles the request
@parameter request: HTTPRequest instance that is going to be modified by the evasion plugin
@return: The modified request
>>> from core.data.parsers.urlParser import url_object
>>> fwe = fullWidthEncode()
>>> u = url_object('http://www.w3af.com/')
>>> r = HTTPRequest( u )
>>> fwe.modifyRequest( r ).url_object.url_string
u'http://www.w3af.com/'
>>> u = url_object('http://www.w3af.com/hola-mundo')
>>> r = HTTPRequest( u )
>>> fwe.modifyRequest( r ).url_object.url_string
u'http://www.w3af.com/%uFF48%uFF4f%uFF4c%uFF41%uFF0d%uFF4d%uFF55%uFF4e%uFF44%uFF4f'
>>> u = url_object('http://www.w3af.com/hola-mundo')
>>> r = HTTPRequest( u )
>>> fwe.modifyRequest( r ).url_object.url_string
u'http://www.w3af.com/%uFF48%uFF4f%uFF4c%uFF41%uFF0d%uFF4d%uFF55%uFF4e%uFF44%uFF4f'
>>> #
>>> # The plugins should not modify the original request
>>> #
>>> u.url_string
u'http://www.w3af.com/hola-mundo'
'''
# This is a test URL
# http://172.16.1.132/index.asp?q=%uFF1Cscript%3Ealert(%22Hello%22)%3C/script%3E
# This is the content of index.asp :
# <%=Request.QueryString("q")%>
# First we mangle the URL
path = request.url_object.getPath()
path = self._mutate( path )
# Now we mangle the postdata
data = request.get_data()
if data:
try:
# Only mangle the postdata if it is a url encoded string
parse_qs( data )
except:
pass
else:
# We get here only if the parsing was successful
data = self._mutate( data )
# Finally, we set all the mutants to the request in order to return it
new_url = request.url_object.copy()
new_url.setPath( path )
new_req = HTTPRequest( new_url , data, request.headers,
request.get_origin_req_host() )
return new_req
def _mutate( self, to_mutate ):
to_mutate = urllib.unquote( to_mutate )
mutant = ''
for char in to_mutate:
if char not in ['?', '/', '&', '\\', '=', '%', '+']:
# The "- 0x20" was taken from UFF00.pdf
char = "%%uFF%02x" % ( ord(char) - 0x20 )
mutant += char
return mutant
def getOptions( self ):
'''
@return: A list of option objects for this plugin.
'''
ol = optionList()
return ol
def setOptions( self, OptionList ):
'''
This method sets all the options that are configured using the user interface
generated by the framework using the result of getOptions().
@parameter OptionList: A dictionary with the options for the plugin.
@return: No value is returned.
'''
pass
def getPluginDeps( self ):
'''
@return: A list with the names of the plugins that should be run before the
current one.
'''
return []
def getPriority( self ):
'''
This function is called when sorting evasion plugins.
Each evasion plugin should implement this.
@return: An integer specifying the priority. 0 is run first, 100 last.
'''
return 50
def getLongDesc( self ):
'''
@return: A DETAILED description of the plugin functions and features.
'''
return '''
This evasion plugin does full width encoding as described here:
- http://www.kb.cert.org/vuls/id/739224
Example:
Input: '/bar/foo.asp'
Output : '/b%uFF61r/%uFF66oo.asp'
'''
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