Arp Spoofing in Strapi with Cockroachdb

Arp spoofing is a network-layer attack where an attacker sends falsified Address Resolution Protocol messages to associate their MAC address with the IP address of a legitimate host. In a setup where Strapi communicates with Cockroachdb, this can expose the database traffic to interception or manipulation. Strapi, as a Node.js headless CMS, often maintains persistent database connections to Cockroachdb using connection strings that include hostnames or IPs reachable over the network. When an attacker performs arp spoofing on the network segment hosting Strapi and Cockroachdb, they can redirect database queries to a malicious host that mimics Cockroachdb, enabling credential harvesting or query tampering.

The exposure is specific to the combination because Strapi typically runs in a backend environment with long-lived TCP sessions to Cockroachdb, which uses TLS for encryption but does not inherently prevent a compromised network node from altering routing. If Strapi’s configuration resolves the Cockroachdb hostname at startup and caches the IP, an arp spoofing attack that changes the mapping mid-session can redirect traffic without immediate detection. Cockroachdb’s distributed SQL protocol relies on consistent node identity; if an attacker spoofs the IP of a legitimate Cockroachdb node, Strapi may unknowingly send sensitive data, such as structured query language statements containing personally identifiable information or authentication tokens, to the attacker-controlled endpoint.

Moreover, the attack surface is expanded when Strapi runs in a containerized or orchestrated environment where network policies are not strict. The database driver used by Strapi (e.g., based on the cockroachdb node driver) may not enforce strict certificate pinning, allowing a spoofed session to present a valid but illegitimate TLS certificate if the attacker obtains a certificate for the target domain. This makes it critical to validate server identity outside the scope of the database protocol itself. The risk is not in the database engine’s internals but in the network path between Strapi and Cockroachdb, where arp spoofing can silently intercept queries and responses without altering the application code or database schema.

To mitigate arp spoofing risks, focus on ensuring that Strapi validates the identity of Cockroachdb nodes and minimizes reliance on network-layer assumptions. Use TLS with strict certificate validation and avoid relying on hostname resolution that can be poisoned after initial lookup. Below are concrete code examples for Strapi that demonstrate secure connections to Cockroachdb.

First, configure the database connection in Strapi’s ./config/database.js to enforce TLS and provide a CA certificate for server identity verification. This ensures that even if an attacker spoofs the IP, they cannot present a certificate trusted by Strapi without the proper CA-signed certificate for the Cockroachdb server.

module.exports = ({ env }) => ({
  connection: {
    connector: 'bookshelf',
    settings: {
      client: 'postgres',
      host: env('DB_HOST', 'my-cockroachdb-internal.service'),
      port: env.int('DB_PORT', 26257),
      database: env('DB_NAME', 'strapi_db'),
      username: env('DB_USERNAME', 'strapi_user'),
      password: env('DB_PASSWORD', 'strong_password'),
      ssl: {
        rejectUnauthorized: true,
        ca: env('DB_CA_CERT'), // PEM-encoded CA certificate
      },
    },
    options: {
      dialectOptions: {
        ssl: {
          rejectUnauthorized: true,
          ca: env('DB_CA_CERT'),
        },
      },
    },
  },
});

Second, use environment variables to inject the CA certificate and avoid hardcoding paths. Ensure the certificate used in DB_CA_CERT is the root or intermediate CA that signed the Cockroachdb node certificates. This prevents a spoofed server from using a certificate issued by an unrelated CA. Additionally, prefer using service names or internal network identifiers that are protected by network segmentation rather than public DNS names that may be subject to DNS spoofing in conjunction with arp spoofing.

Third, implement runtime checks in Strapi’s initialization phase to verify the server certificate fingerprint against a known value. This adds a layer of assurance beyond standard CA validation. The following example demonstrates how to add a custom hook in Strapi that logs a warning if the certificate fingerprint does not match an expected value.

// In ./src/api/_content-manager/content-manager.js or a custom plugin
module.exports = {
  async bootstrap() {
    const tls = require('tls');
    const fs = require('fs');
    const expectedFingerprint = process.env.COCKROACHDB_CERT_FINGERPRINT; // SHA-256 fingerprint
    const socket = tls.connect({ host: process.env.DB_HOST, port: 26257, ca: [fs.readFileSync(process.env.DB_CA_CERT)], rejectUnauthorized: true }, () => {
      const cert = socket.getPeerCertificate();
      const fingerprint = crypto.createHash('sha256').update(cert.raw).digest('hex');
      if (fingerprint !== expectedFingerprint) {
        strapi.log.error('Cockroachdb certificate fingerprint mismatch. Possible arp spoofing or MITM attack.');
        process.exit(1);
      }
      socket.end();
    });
  },
};

These steps reduce the risk of successful arp spoofing by ensuring that Strapi validates server identity using cryptographic material that an attacker cannot easily replicate without access to the Cockroachdb cluster’s private CA. Network-level defenses such as static ARP entries or port security on switches further complement these code-level measures.