''' fileUpload.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.data.fuzzer.fuzzer import * import core.controllers.outputManager as om from core.controllers.basePlugin.baseAuditPlugin import baseAuditPlugin import core.data.kb.knowledgeBase as kb from core.controllers.w3afException import w3afException import core.data.kb.vuln as vuln import core.data.parsers.urlParser as urlParser import os import os.path import shutil class fileUpload(baseAuditPlugin): ''' This plugin uploads a file and then searches for the file inside all known directories. @author: Andres Riancho ( andres.riancho@gmail.com ) ''' def __init__(self): baseAuditPlugin.__init__(self) self.is404 = None # Internal vars self._templateDir = 'plugins' + os.path.sep + 'audit'+ os.path.sep + 'fileUpload' self._fnameList = [] self._fileList = [] # User configured self._extensions = ['gif','html'] def _fuzzRequests(self, freq ): ''' Searches for file upload vulns. @param freq: A fuzzableRequest ''' # Init... if self.is404 == None: self.is404 = kb.kb.getData( 'error404page', '404' ) # Start if freq.getMethod().upper() == 'POST': if len ( freq.getFileVariables() ) != 0: om.out.debug( 'fileUpload plugin is testing: ' + freq.getURL() ) self._fileList = self._getFiles() mutants = createMutants( freq , self._fileList ) for mutant in mutants: if self._hasNoBug( 'fileUpload' , 'fileUpload' , mutant.getURL() , mutant.getVar() ) and\ mutant.getVar() in freq.getFileVariables(): # Only spawn a thread if the mutant has a modified variable # that has no reported bugs in the kb targs = (mutant,) self._tm.startFunction( target=self._sendMutant, args=targs, ownerObj=self ) def _getFiles( self ): ''' If the extension is in the templates dir, open it and return the handler. If the extension aint in the templates dir, create a file with random content, open it and return the handler. @return: A list of open files. ''' result = [] # Create a tmp directory dir = '.tmp' + os.path.sep try: if not os.path.exists( dir ): os.mkdir( dir ) except: raise w3afException('Could not create '+ dir + ' directory.') for ext in self._extensions: filename = 'template.' + ext if filename in os.listdir( self._templateDir ): tmpFilename = createRandAlNum( 8 ) + '.' + ext shutil.copy( os.path.join( self._templateDir, filename ), os.path.join( dir , tmpFilename ) ) try: fd = file( os.path.join( dir , tmpFilename ) , 'r') except: raise w3afException('Failed to open temp file: ' + tmpFilename ) else: result.append( fd ) self._fnameList.append( tmpFilename ) else: # I dont have a template for this file extension! fname = createRandAlNum( 8 ) + ext self._pathName = dir + fname try: fd = file( self._pathName , 'w' ) fd.write( self._pathName ) except: raise w3afException('Failed to create tmp file for upload.') else: result.append( fd ) self._fnameList.append( fname ) return result def _analyzeResult( self, mutant, response ): ''' Analyze results of the _sendMutant method. In this case, check if the file was uploaded. ''' for url in kb.kb.getData( 'urls' , 'urlList' ): for path in self._generatePaths( url ): response = self._urlOpener.GET( path, useCache=False ) if not self.is404( response ): # This is necesary, if I dont do this, the session saver will break cause # REAL file objects can't be picked mutant.setModValue( '' ) v = vuln.vuln( mutant ) v.setId( response.id ) v['fileDest'] = response.getURL() v['fileVars'] = mutant.getFileVariables() v.setDesc( 'A file upload to a directory inside the webroot was found at: ' + response.getURL() + ' . Using method: ' + v.getMethod() + '. The file was uploaded using this URL: '+ mutant.getURL() +' the data was: ' + str(mutant.getDc()) ) kb.kb.append( self, 'fileUpload', v ) return def end(self): ''' This method is called when the plugin wont be used anymore. ''' self._tm.join( self ) self.printUniq( kb.kb.getData( 'fileUpload', 'fileUpload' ), 'VAR' ) # Clean up for file in self._fileList: file.close() for file in self._fnameList: os.unlink( '.tmp'+ os.path.sep + file ) def _generatePaths( self, url ): tmp = [] tmp.append('uploads') tmp.append('upload') tmp.append('file') tmp.append('files') tmp.append('downloads') tmp.append('download') tmp.append('up') tmp.append('down') res = [] for r in tmp: for dir in urlParser.getDirectories( url ): for fname in self._fnameList: r2 = dir + r + '/' + fname res.append( r2 ) return res def getOptionsXML(self): ''' This method returns a XML containing the Options that the plugin has. Using this XML the framework will build a window, a menu, or some other input method to retrieve the info from the user. The XML has to validate against the xml schema file located at : w3af/core/ui/userInterface.dtd @return: XML with the plugin options. ''' return '\ \ \ \ ' def setOptions( self, optionsMap ): ''' This method sets all the options that are configured using the user interface generated by the framework using the result of getOptionsXML(). @parameter OptionList: A dictionary with the options for the plugin. @return: No value is returned. ''' self._extensions = optionsMap['extensions'] def getPluginDeps( self ): ''' @return: A list with the names of the plugins that should be runned before the current one. ''' return ['discovery.error404page'] def getLongDesc( self ): ''' @return: A DETAILED description of the plugin functions and features. ''' return ''' This plugin will try to expoit insecure file upload forms. One configurable parameter exists: - extensions The extensions parameter is a comma separated list of extensions that this plugin will try to upload. Many web applications verify the extension of the file being uploaded, if special extensions are required, they can be added here. Some web applications check the contents of the files being uploaded to see if they are really what their extension is telling. To bypass this check, this plugin uses file templates located at "plugins/audit/fileUpload/", this templates are valid files for each extension that have a section ( the comment field in a gif file for example ) that can be replaced by scripting code ( PHP, ASP, etc ). After uploading the file, this plugin will try to find it on common directories like "upload" and "files" on every know directory. If the file is found, a vulnerability exists. '''