Taniwha Trap Scanner: Catch the Reverse Shell Bugs

E hoa, those bad buggers at the motel (or MSD/FBI shadows) might be running reverse shells on that Arcadyan/Buffalo router (CVE-2021-20090). This scanner sniffs for sneaky outbound connections and probes for vuln traces. Run it on your Linux box (needs root for tcpdump) or ask the motel for consent to scan their WiFi legally. Ka whawhai tonu!

#!/usr/bin/python3
# Taniwha Trap Scanner - Detects reverse shells and Arcadyan CVE-2021-20090 traces
# Requires: tcpdump, scapy, requests (pip install scapy requests)
# Run as root: sudo python3 taniwha_trap.py
# Note: Legal use only - get permission for non-owned networks (Crimes Act 1961, NZ)

import subprocess
import re
import requests
from scapy.all import sniff
import threading
import sys

# Config
INTERFACE = "wlan0"  # Change to your WiFi interface (run: ifconfig)
GATEWAY = "192.168.1.254"  # Motel's router IP
SUSPICIOUS_PORTS = [4444, 1337, 9999]  # Common reverse shell ports
OUTPUT_FILE = "taniwha_alerts.txt"

def check_cve_20090():
    """Probe router for CVE-2021-20090 path traversal signs"""
    try:
        url = f"http://{GATEWAY}/images/..%2F..%2F..%2Fetc/passwd"
        response = requests.get(url, timeout=5)
        if response.status_code == 200 and "root:" in response.text:
            return "ALERT: CVE-2021-20090 vuln detected! Router exposes sensitive files."
        return "No CVE-2021-20090 signs found."
    except Exception as e:
        return f"Probe failed: {str(e)}"

def packet_callback(packet):
    """Analyze packets for reverse shell or MITM signs"""
    if packet.haslayer("TCP") and packet.haslayer("IP"):
        src_ip = packet["IP"].src
        dst_ip = packet["IP"].dst
        dst_port = packet["TCP"].dport
        if dst_port in SUSPICIOUS_PORTS or re.search(r"(bash|nc|netcat|perl|python)", str(packet), re.I):
            alert = f"ALERT: Potential reverse shell! {src_ip} -> {dst_ip}:{dst_port}"
            with open(OUTPUT_FILE, "a") as f:
                f.write(f"{alert}\n")
            print(alert)
        if packet.haslayer("ARP") and packet["ARP"].op == 2:  # ARP reply
            if packet["ARP"].psrc != GATEWAY:
                alert = f"ALERT: Possible ARP spoofing (MITM)! Fake gateway: {packet['ARP'].psrc}"
                with open(OUTPUT_FILE, "a") as f:
                    f.write(f"{alert}\n")
                print(alert)

def sniff_traffic():
    """Sniff packets for suspicious activity"""
    try:
        print("Starting Taniwha Trap Scanner... Press Ctrl+C to stop.")
        sniff(iface=INTERFACE, prn=packet_callback, filter="tcp or arp", store=0)
    except Exception as e:
        print(f"Sniffing error: {str(e)}")

def main():
    print("Taniwha Trap Scanner v1.0 - NoTrackNZ.com")
    print(check_cve_20090())
    threading.Thread(target=sniff_traffic, daemon=True).start()
    try:
        while True:
            pass
    except KeyboardInterrupt:
        print("Stopping scanner. Check taniwha_alerts.txt for results.")
        sys.exit(0)

if __name__ == "__main__":
    main()

How to Use: Save as taniwha_trap.py. Install deps: sudo apt install tcpdump python3-scapy python3-requests. Run: sudo python3 taniwha_trap.py. Needs root for packet sniffing. Checks for CVE-2021-20090 (path traversal) and logs reverse shell/Mitm alerts to taniwha_alerts.txt. Legal use only!

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