Arp Spoofing in Rocket with Cockroachdb

Arp Spoofing is a Layer 2 attack where an attacker sends falsified Address Resolution Protocol messages to associate their MAC address with the IP of a legitimate host, typically the gateway or another database server. In a Rocket application using Cockroachdb as the backend datastore, this creates a risk where an attacker on the same network segment can intercept, modify, or block traffic between the Rocket service and the Cockroachdb cluster. Rocket applications often maintain long-lived or pooled database connections; if an attacker spoofs the Cockroachdb node IP, the Rocket service may unknowingly send SQL queries and credentials over the malicious host.

Because Cockroachdb relies on consistent node identity and encrypted communication between nodes, ARP manipulation does not directly alter TLS certificates, but it can redirect traffic to an attacker who chooses to forward it (man-in-the-middle). This can expose authentication credentials, query patterns, and result sets. In clustered Cockroachdb deployments, ARP spoofing against inter-node communication paths can cause session disruptions or enable traffic interception if encryption in transit is not enforced end-to-end. Rocket endpoints that expose database-related operations can become vectors if input validation is weak, allowing an attacker to influence query routing or trigger error paths that reveal stack traces or configuration details.

When scanning such a setup with middleBrick, the LLM/AI Security checks can detect whether unauthenticated endpoints expose patterns that could be abused to probe service discovery or node metadata. While middleBrick does not fix the issue, its findings can highlight misconfigured network segments or overly permissive routing that facilitates ARP spoofing. The scanner’s authentication and BOLA/IDOR checks can reveal whether endpoints inadvertently allow tampering with resource identifiers that could be leveraged in a spoofing scenario.

Remediation focuses on ensuring that Rocket routes and handlers do not trust Layer 2 address assumptions and that Cockroachdb connections are hardened. Use static routes or host entries for database nodes where possible, enforce mTLS between Rocket and Cockroachdb, and validate all inputs that could affect query construction or node selection. Below are concrete examples using the Rocket and diesel crates with Cockroachdb.

• Enforce strict source validation and prepared statements to prevent injection that could be combined with ARP manipulation to alter intent:

use rocket::get;
use rocket::serde::json::Json;
use diesel::pg::PgConnection;
use diesel::prelude::*;
use crate::schema::users::dsl::*;

#[get("/user/")]
pub fn get_user(user_id: i32, db_conn: &rocket::State<Pool>) -> Result<Json<User>, rocket::http::Status> {
    let conn = db_conn.get().map_err(|_| rocket::http::Status::InternalServerError)?;
    let found = users.filter(id.eq(user_id))
        .first::<User>(&conn)
        .map_err(|_| rocket::http::Status::NotFound)?;
    Ok(Json(found))
}

• Use TLS configuration with certificate verification for Cockroachdb connections:

use diesel::r2d2::{self, ConnectionManager};
use diesel::PgConnection;

pub type Pool = r2d2::Pool<ConnectionManager<PgConnection>>;

fn establish_pool() -> Pool {
    let database_url = std::env::var("DATABASE_URL").expect("DATABASE_URL must be set");
    // Ensure the connection enforces host and certificate validation
    let manager = ConnectionManager::::new(database_url);
    r2d2::Pool::builder()
        .max_size(10)
        .build(manager)
        .expect("Failed to create pool")
}

• Apply network policies and runtime checks to limit exposure to spoofed MAC addresses; for example, validate expected node hostnames in your service discovery before establishing connections:

use rocket::fairing::AdHoc;
use rocket::State;
use std::net::IpAddr;

fn verify_db_node(node_ip: IpAddr, expected: &[IpAddr]) -> bool {
    expected.contains(&node_ip)
}

#[rocket::main]
async fn main() {
    let expected_ips = vec!["2601:4c6:abcd::1".parse().unwrap(), "10.0.0.3".parse().unwrap()];
    let db_node: IpAddr = "10.0.0.3".parse().unwrap();
    if verify_db_node(db_node, &expected_ips) {
        rocket::build().manage(establish_pool()).mount("/", routes![get_user]).launch().await.unwrap();
    } else {
        panic("Unexpected database node IP, possible ARP spoofing or misconfiguration");
    }
}

These patterns reduce the attack surface by ensuring that Rocket endpoints do not implicitly trust network-layer identities and that Cockroachdb connections are established only after validating node properties. Defense in depth also includes monitoring for unusual ARP cache changes in the hosting environment and using encrypted connections for all inter-node and client-database traffic.