Arp Spoofing in Adonisjs with Session Cookies

Arp spoofing is a link-layer attack where an adversary sends falsified Address Resolution Protocol messages to associate their MAC address with the IP address of another host, typically the default gateway. In an AdonisJS application that relies on session cookies for authentication, this attack can subvert the apparent security of cookie-based sessions when transport protections are absent or when an attacker is positioned on the local network.

Consider a typical AdonisJS setup using cookie-based sessions with @adonisjs/session and secure, signed cookies. A developer may configure the application to trust the Secure and HttpOnly attributes and may assume that cookie transmission alone protects identity. However, if an attacker performs arp spoofing between the client and the server, they can intercept and observe HTTP traffic on the local network. Even if cookies are not directly stolen in plaintext due to HTTPS, the attacker can conduct session fixation or observe timing and behavioral patterns to correlate a victim’s IP and session context. More critically, if the application or its upstream infrastructure (load balancer, reverse proxy) does not enforce strict transport integrity, an active network attacker may manipulate routes and redirect traffic to a malicious host, effectively terminating or altering the session in ways the server cannot distinguish from legitimate routing anomalies.

AdonisJS itself does not provide network-layer protections; it assumes the transport is managed by infrastructure (TLS termination, proxy headers, etc.). When arp spoofing compromises the local network segment, the confidentiality and integrity guarantees of session cookies depend entirely on external controls. Without enforcing HTTPS for all requests and validating the SameSite and Secure attributes, an attacker positioned via arp spoofing can more easily manipulate session context or coerce requests that appear legitimate to the server. The server sees valid signed cookies and cannot differentiate a maliciously altered request path from a benign network event, enabling abuse such as privilege escalation via predictable identifiers (BOLA/IDOR) or theft of privileged session states.

For example, an attacker who successfully spoofs ARP entries may intercept a victim’s requests to an AdonisJS endpoint that relies on an exposed numeric resource ID in the URL (e.g., /users/123). If the server uses the session to identify the user but does not enforce strict ownership checks, the attacker can use the intercepted session to perform BOLA attacks, accessing or modifying resources belonging to the victim. The presence of session cookies does not mitigate this; it simply provides a valid credential that the attacker can leverage once the network path is compromised.

Therefore, arp spoofing highlights the need to treat the network perimeter as hostile even when cookies are used. Defenses must be applied at the transport and architectural layers, not solely within the application framework. This includes enforcing strict TLS, using HSTS, validating proxy headers correctly, and applying framework-level protections that assume the network cannot be trusted.

Remediation focuses on hardening cookie attributes, enforcing HTTPS, and ensuring server-side authorization does not rely on network-layer assumptions. Below are concrete, idiomatic AdonisJS examples that address risks exposed by arp spoofing.

Enforce HTTPS and Secure Cookies

Ensure all cookie-based sessions are transmitted only over encrypted channels and are marked as Secure. In AdonisJS, configure the session provider to use HTTPS-only cookies and set appropriate domain/path constraints.

// config/session.ts
import { SessionConfig } from '@ioc:Adonis/Addons/Session'

const sessionConfig: SessionConfig = {
  driver: 'cookie',
  cookie: {
    name: 'session',
    httpOnly: true,
    secure: true, // only sent over HTTPS
    sameSite: 'strict', // or 'lax' depending on cross-site needs
    path: '/',
    domain: 'yourdomain.com', // restrict to your domain
    maxAge: 24 * 60 * 60 * 1000, // 1 day
  },
  signed: true, // ensure cookies are signed
}

export default sessionConfig

Validate and Sanitize Inputs to Prevent BOLA/IDOR

Session cookies identify the user, but the server must still enforce ownership on every request. Use route-level checks to ensure users can only access their own resources, regardless of network conditions.

// controllers/UsersController.ts
import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'
import User from 'App/Models/User'

export default class UsersController {
  public async show({ params, auth }: HttpContextContract) {
    const user = await auth.authenticate()
    // Ensure the requested user ID matches the authenticated user
    if (params.id !== user.id.toString()) {
      throw new Error('Unauthorized: resource mismatch')
    }
    return user
  }
}

Use Anti-CSRF Tokens for State-Changing Requests

Even with secure cookies, arp spoofing may enable request forgery if the attacker can predict or coerce requests. Use CSRF protection for forms and state-changing operations.

// In a form view (Edge template)

  
  


// config/csrf.ts — ensure CSRF is enabled for relevant routes
import { CsrfConfig } from '@ioc:Adonis/Addons/Csrf'

const csrfConfig: CsrfConfig = {
  enabled: true,
  tokenAge: 24 * 60 * 60 * 1000,
  cookie: {
    httpOnly: true,
    secure: true,
    sameSite: 'strict',
  },
}

export default csrfConfig

Implement Transport Hardening and HSTS

While not AdonisJS-specific, ensure your server sets HTTP Strict Transport Security headers to prevent downgrade attacks that could make cookies vulnerable even when Secure is set.

// start/hooks.ts
import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'

export const hooks = {
  async beforeHandle({ response }: { response: any }) {
    response.header('Strict-Transport-Security', 'max-age=31536000; includeSubDomains')
  },
}

These measures reduce the impact of arp spoofing by ensuring cookies are never transmitted insecurely and that server-side checks are independent of network topology.