Security Misconfiguration in Fiber with Cockroachdb

Security misconfiguration in a Fiber application using CockroachDB often arises from a mismatch between relaxed development defaults and production security expectations. When the database connection is established without enforcing strict TLS settings or client certificate verification, the communication channel between Fiber and CockroachDB can be exposed to passive interception. CockroachDB supports secure connections via TLS, and omitting these settings in Fiber routes allows unencrypted or improperly encrypted traffic, increasing the risk of credential or data exposure.

A common misconfiguration involves the use of default or empty credentials combined with overly permissive network access controls. For example, binding the Fiber server to 0.0.0.0 while leaving the CockroachDB SQL port publicly accessible removes network-layer segregation. This exposes the database to unauthorized queries or reconnaissance from untrusted networks. Insecure configuration of database connection parameters, such as disabling statement timeouts or query size limits, can also lead to resource exhaustion or injection amplification when handled by Fiber handlers.

Middleware misalignment adds another dimension to misconfiguration in this stack. If Fiber routes do not enforce authentication before passing requests to database queries, an attacker may exploit missing guards to interact directly with query-building logic. Improper handling of user input that is concatenated into SQL strings without parameterization can lead to injection even when using an ORM layer. Because CockroachDB supports PostgreSQL wire protocol, tools targeting PostgreSQL misconfigurations can often be adapted to exploit similar issues in CockroachDB when used through Fiber.

Another subtle misconfiguration involves logging and error handling. Verbose database errors returned by CockroachDB may be inadvertently surfaced through Fiber responses, exposing schema details or connection hints. Retained query logs or debug endpoints enabled in development mode can persist into production, creating an information leakage path. These issues are detectable during an unauthenticated scan, where endpoint behavior and response patterns reveal insecure defaults or missing controls.

Using middleBrick to scan a Fiber endpoint interacting with CockroachDB can surface these misconfigurations by testing authentication, input validation, and data exposure checks. The scan correlates findings from OpenAPI specifications with runtime behavior, highlighting areas where configuration deviates from secure baselines. This approach helps teams identify missing TLS enforcement, weak authentication flows, and overly broad network exposure before an attacker does.

To remediate security misconfiguration when using CockroachDB with Fiber, enforce TLS for all database connections and validate server certificates. Below is a secure PostgreSQL connection example using the pgx driver with TLS configuration tailored for CockroachDB.

package main

import (
    "context"
    "crypto/tls"
    "crypto/x509"
    "io/ioutil"
    "log"
    "net/http"

    "github.com/gofiber/fiber/v2"
    "github.com/jackc/pgx/v5/pgxpool"
)

func main() {
    // Load client certificate and key
    cert, err := tls.LoadX509KeyPair("client.crt", "client.key")
    if err != nil {
        log.Fatalf("failed to load key pair: %v", err)
    }

    // Load CA cert
    caCert, err := ioutil.ReadFile("ca.crt")
    if err != nil {
        log.Fatalf("failed to read CA cert: %v", err)
    }
    caCertPool := x509.NewCertPool()
    caCertPool.AppendCertsFromPEM(caCert)

    tlsConfig := &tls.Config{
        Certificates:       []tls.Certificate{cert},
        RootCAs:            caCertPool,
        InsecureSkipVerify: false,
    }

    connConfig, err := pgxpool.ParseConfig("postgresql://user:password@db-host:26257/appdb?sslmode=verify-full")
    if err != nil {
        log.Fatalf("failed to parse config: %v", err)
    }
    connConfig.ConnConfig.TLSConfig = tlsConfig

    pool, err := pgxpool.NewWithConfig(context.Background(), connConfig)
    if err != nil {
        log.Fatalf("failed to create pool: %v", err)
    }
    defer pool.Close()

    app := fiber.New()

    app.Get("/users/:id", func(c *fiber.Ctx) error {
        var userEmail string
        row := pool.QueryRow(c.Context(), "SELECT email FROM users WHERE id = $1", c.Params("id"))
        if err := row.Scan(&userEmail); err != nil {
            return c.Status(http.StatusInternalServerError).JSON(fiber.Map{"error": "unable to fetch user"})
        }
        return c.JSON(fiber.Map{"email": userEmail})
    })

    log.Fatal(app.Listen(":3000"))
}

This configuration ensures that the client authenticates the CockroachDB server using a trusted CA and presents its own certificate. Use parameterized queries or prepared statements to prevent injection, and avoid concatenating user input into SQL strings. For connection pooling, set MaxConns and timeouts to prevent resource exhaustion under load.

Additionally, restrict network access to the CockroachDB port using firewall rules and avoid binding Fiber to 0.0.0.0 in production. Instead, bind to 127.0.0.1 or a private interface and use a reverse proxy for external access. Combine these practices with middleware that validates authentication tokens before allowing database calls, ensuring that even if a route is misconfigured, access to sensitive data remains controlled.

Using middleBrick CLI (middlebrick scan <url>) or integrating the GitHub Action into your CI/CD pipeline can validate that TLS settings and query patterns meet expected security baselines. The scanner checks input validation, authentication requirements, and data exposure paths, helping teams confirm that CockroachDB interactions remain securely configured within the Fiber application.