Cross Site Request Forgery in Buffalo with Cockroachdb

Cross Site Request Forgery (CSRF) in a Buffalo application using CockroachDB arises when state-changing HTTP requests (POST, PUT, DELETE) rely solely on cookies for authentication without anti-CSRF tokens. Buffalo leverages cookie-based sessions by default; if routes that modify data do not require a same-site cookie and a per-request CSRF token, an attacker can trick a logged-in user’s browser into submitting requests that the database will process with the user’s privileges.

With CockroachDB as the backend, the risk is not in the database itself but in how the application layer issues SQL statements. For example, a handler that builds an UPDATE or DELETE query using string concatenation or raw SQL without validating the request origin can be exploited to change another user’s record. Consider a route that updates a user’s email:

// WARNING: vulnerable pattern — no CSRF protection
func UpdateEmail(c buffalo.Context) error {
    tx := c.Value("tx").(*pop.Connection)
    userID := c.Param("userID")
    email := c.Request().FormValue("email")
    _, err := tx.Exec("UPDATE users SET email = '" + email + '' WHERE id = ' + userID) // vulnerable to SQLi and CSRF
    if err != nil {
        return c.Error(500, err)
    }
    return c.Render(200, r.JSON(map[string]string{"email": email}))
}

An attacker can host a malicious page that submits a form to this endpoint from another origin. If the victim’s browser includes the session cookie, Buffalo processes the request and executes the SQL on CockroachDB. Because CockroachDB does not have an inherent concept of web session tokens, the database trusts the request once it reaches the transaction layer. Without CSRF mitigation, any authenticated session can be abused to perform unwanted actions across origins.

The OpenAPI/Swagger spec for such endpoints often describes parameters and authentication as “cookie” but does not enforce anti-CSRF requirements. middleBrick scans can detect dangerous patterns like raw SQL concatenation and missing CSRF protections in Buffalo handlers, flagging high-severity findings under Authentication and Input Validation checks.

For LLM-related endpoints, the same CSRF risk applies if the application exposes an unauthenticated or weakly protected endpoint that accepts user-supplied prompts and forwards them to an LLM service. middleBrick’s LLM/AI Security checks include active prompt injection testing and system prompt leakage detection to identify endpoints that might be abused to coerce models into unwanted behavior.

Overall, the combination of Buffalo’s cookie-centric sessions, CockroachDB-backed persistence, and missing CSRF controls creates a path where forged requests can execute unintended database operations. Defenses must be implemented at the application layer, including tokens and strict origin checks.

Remediation centers on ensuring every state-changing request includes a verifiable anti-CSRF token and that database interactions are parameterized. In Buffalo, you can use the built-in csrf middleware and ensure SQL execution uses placeholders.

1) Enable CSRF protection globally:

// app.go
package app

import ("github.com/gobuffalo/buffalo"
        "github.com/gobuffalo/buffalo/middleware")

func App() *buffalo.App {
    if app == nil {
        app = buffalo.New(buffalo.Options{
            SessionStore: &middleware.SessionCookieStore{},
            Csrf:         &middleware.CsrfMiddleware{},
        })
        // This will add X-CSRF-Token handling and require tokens for non-safe methods
    }
    return app
}

When the CSRF middleware is active, Buffalo will set a _csrf_token in the session and expect it in headers or form fields for POST/PUT/DELETE requests. Frontend forms should include the token:

<form action="/users/123/update-email" method="POST">
  <input type="hidden" name="_csrf_token" value="{{ .csrfToken }}">
  <input type="email" name="email" value="user@example.com">
  <button>Save</button>
</form>

2) Use parameterized SQL with pop/query arguments instead of string concatenation:

// handlers/user_handler.go
func UpdateEmail(c buffalo.Context) error {
    tx := c.Value("tx").(*pop.Connection)
    userID := c.Param("userID")
    email := c.Param("email") // validated and sanitized if needed

    // Safe: placeholders prevent SQL injection and avoid accidental data exposure in logs
    err := tx.RawQuery("UPDATE users SET email = $1 WHERE id = $2", email, userID).Exec()
    if err != nil {
        return c.Error(500, err)
    }
    return c.Render(200, r.JSON(map[string]string{"email": email}))
}

3) Validate and enforce same-site cookies and secure headers:

// app.go additions
app.Session(&middleware.SessionOptions{
    CookieName: "_buffalo_session",
    Secure:     true,
    HttpOnly:   true,
    SameSite:   http.SameSiteStrictMode,
})

4) For API routes, require the X-CSRF-Token header for state-changing methods and reject requests without it. Combine with CORS policies that limit origins. middleBrick’s scans can verify that these controls are present and that no endpoints rely solely on cookies for critical actions.

By pairing Buffalo’s CSRF middleware with CockroachDB parameterized queries and strict cookie attributes, the application mitigates CSRF while maintaining safe interactions with the database.