Clickjacking in Axum with Mongodb

Clickjacking is a client-side attack that tricks a user into interacting with a hidden UI element through an invisible or disguised frame. In an Axum application that uses MongoDB for session or user data storage, the risk emerges when server-rendered pages do not enforce frame-embedding protections and MongoDB stores or serves data used by those pages without additional context checks. Axum, being a Rust web framework, does not set frame-related headers automatically; if developers omit middleware or response headers, an attacker can embed the app’s UI inside an <iframe> and coerce authenticated users into performing unintended actions while authenticated to MongoDB-backed resources.

Consider an Axum handler that reads user-specific data from MongoDB and renders a form to update sensitive settings, such as changing an email or confirming a transaction. If the response does not include Content-Security-Policy with frame-ancestors, X-Frame-Options, or X-Content-Type-Options, an attacker-controlled page can load the form in a transparent overlay, align the target button beneath the attacker’s UI element, and relay mouse events to perform the action using the victim’s credentials and MongoDB-stored identity. Because MongoDB may hold user preferences or permissions used to decide what the UI displays, a compromised session or a forged request can lead to privilege escalation or unauthorized updates when the application relies solely on the UI layer for authorization checks without revalidating MongoDB-bound permissions at the handler level.

Moreover, if Axum endpoints embed MongoDB ObjectIds or references directly in URLs or hidden form fields without anti-CSRF tokens, an attacker can craft a malicious page that drives interactions between the user’s authenticated MongoDB session and the vulnerable UI. For example, a profile update endpoint that fetches a user document by ID from MongoDB and renders a form is susceptible if the handler does not verify the same origin or enforce strict referrer checks. The combination of Axum’s flexibility in composing responses and MongoDB’s role as a source of truth for user state amplifies the impact when frame-protection mechanisms are absent.

Remediation focuses on two layers: HTTP headers to prevent framing and server-side checks that align MongoDB data usage with secure request validation. Below are concrete Axum examples that incorporate MongoDB driver operations alongside security headers and CSRF mitigation.

1. Set frame-protection headers and CSP

use axum::{response::Response, http::header::HeaderValue};
use headers::{HeaderMapExt, ContentSecurityPolicy, XFrameOptions};

fn secure_response() -> Response {
    let mut response = Response::new("OK".into());
    // Prevent framing
    response.headers_mut().typed_insert(XFrameOptions::deny());
    // Restrict frame ancestors to none
    let mut csp = ContentSecurityPolicy::default();
    csp = csp.frame_ancestors(headers::content_security_policy::FrameAncestors::None);
    response.headers_mut().typed_insert(csp);
    response
}

2. Validate permissions against MongoDB documents on each sensitive action

Do not rely on UI-level checks alone. Re-fetch and verify permissions stored in MongoDB when processing state-changing requests.

use axum::{extract::State, http::StatusCode, Json};
use mongodb::{bson::{doc, oid::ObjectId}, Collection};
use serde::{Deserialize, Serialize};

#[derive(Debug, Deserialize)]
struct UpdateEmailRequest {
    user_id: String,
    new_email: String,
}

#[derive(Debug, Serialize, Deserialize)]
struct User {
    #[serde(rename = "_id")]
    id: ObjectId,
    email: String,
    permissions: Vec,
}

async fn update_email_handler(
    State(db): State>,
    Json(payload): Json,
) -> Result {
    // Verify requesting user from session or auth context; here simplified as actor_id
    let actor_id = ObjectId::parse_str(&payload.user_id).map_err(|_| StatusCode::FORBIDDEN)?;
    let filter = doc! { "_id": actor_id };
    let user = db.find_one(filter, None).await.map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?
        .ok_or(StatusCode::FORBIDDEN)?;

    // Re-check permissions stored in MongoDB
    if !user.permissions.contains(&"can_change_email".to_string()) {
        return Err(StatusCode::FORBIDDEN);
    }

    // Perform update ensuring the same user context
    let update = doc! { "$set": { "email": payload.new_email } };
    db.update_one(doc! { "_id": actor_id }, update, None)
        .await
        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

    Ok(StatusCode::OK)
}

3. Use CSRF tokens for state-changing operations even when authenticated via MongoDB sessions

use axum::{extract::State, http::StatusCode, Json};
use mongodb::{bson::{doc, Document}, Collection};
use uuid::Uuid;

async fn generate_csrf_token(
    State(db): State>,
    user_id: String,
) -> Result, StatusCode> {
    let token = Uuid::new_v4().to_string();
    let filter = doc! { "user_id": &user_id };
    let update = doc! { "$set": { "csrf_token": token.clone() } };
    db.update_one(filter, update, None).await.map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
    Ok(Json(token))
}

async fn verify_csrf_token(
    State(db): State>,
    user_id: String,
    provided: String,
) -> bool {
    let filter = doc! { "user_id": &user_id, "csrf_token": provided };
    let count = db.count_documents(filter, None).await.unwrap_or(0);
    count > 0
}