Privilege Escalation in Actix with Cockroachdb

Actix is a high-performance Rust web framework that encourages asynchronous request handling and strongly typed extractors. When paired with CockroachDB, a distributed SQL database compatible with PostgreSQL wire protocol, the application often runs with database-level roles that grant broader permissions than the application strictly needs for each endpoint. Privilege escalation arises when Actix routes or extractors do not enforce per-request authorization and instead rely on coarse database roles or session-based permissions.

Consider an Actix handler that uses a shared database pool with a CockroachDB user that has CREATE, DELETE, and UPDATE permissions on sensitive tables. If the handler resolves a user identity only from a JWT payload and maps it directly to a database account or to ORM models without verifying ownership or scope, an attacker who can tamper with the JWT (or exploit IDOR in URL parameters) may issue actions under a higher-privileged database role. For example, an endpoint like /users/{user_id}/promote might accept an integer ID from the URL, pass it to a Diesel or SQLx query that executes a role-specific UPDATE users SET role = 'admin' without confirming that the requesting user owns or is allowed to modify that target ID. Because CockroachDB does not enforce row-level security by default, the database executes the statement with the pooled user’s privileges, effectively elevating the attacker’s capabilities beyond what the application logic intended.

Another scenario involves prepared statements and ORM misuse. In Actix, developers sometimes bind user input directly into dynamic queries with Diesel or SQLx while relying on CockroachDB’s role memberships to gate operations. If the application uses a role with broader permissions (for example, to support batch jobs or migrations) and those credentials are reachable from web handlers, a compromised or malicious actor can chain IDOR or BOLA flaws to invoke administrative operations. Real-world patterns include using a single cockroach node client with a high-privilege certificate for simplicity, inadvertently exposing write paths to endpoints that should be read-only. This is especially risky when combined with weak input validation, where an attacker supplies crafted IDs, timestamps, or enum strings to trigger unintended state changes in tables such as permissions or audit_log.

Because middleBrick tests unauthenticated attack surfaces and runs 12 security checks in parallel, it can surface this class of issue by correlating authentication bypass, BOLA/IDOR, and privilege escalation findings with database interaction patterns. The scanner does not alter your code; it reports findings with severity and remediation guidance so you can align Actix routes and CockroachDB role usage with least-privilege principles.

Remediation focuses on narrowing database permissions, validating ownership, and avoiding shared high-privilege roles for routine web requests. Below are concrete, realistic examples using SQLx with Postgres-compatible CockroachDB in an Actix service.

1. Use distinct roles and connection pools

Create a dedicated CockroachDB role for read-only web traffic and another for write/admin tasks. In your Actix configuration, maintain separate pool instances.

// src/db.rs
use sqlx::postgres::PgConnectOptions;
use sqlx::PgPool;
use std::env;

pub fn read_pool() -> PgPool {
    let database_url = env::var("COCKROACHDB_READ_URL").expect("READ_URL must be set");
    let opts: PgConnectOptions = database_url.parse().expect("invalid read URL");
    PgPool::connect_lazy(&opts)
}

pub fn write_pool() -> PgPool {
    let database_url = env::var("COCKROACHDB_WRITE_URL").expect("WRITE_URL must be set");
    let opts: PgConnectOptions = database_url.parse().expect("invalid write URL");
    PgPool::connect_lazy(&opts)
}

2. Enforce ownership checks in Actix handlers

Do not rely on database roles alone; verify that the authenticated actor owns the target resource before issuing privileged queries.

// src/handlers.rs
use actix_web::{web, HttpResponse};
use sqlx::PgPool;
use serde::{Deserialize, Serialize};

#[derive(Deserialize)]
pub struct PromoteParams {
    pub target_user_id: i32,
}

#[derive(Serialize)]
pub struct ApiResponse {
    pub ok: bool,
}

pub async fn promote_user(
    params: web::Query,
    pool: web::Data<PgPool>,
    current_user: crate::auth::CurrentUser,
) -> Result<HttpResponse, actix_web::Error> {
    // Ensure the requester is allowed to promote this user
    let can_promote: (bool,) = sqlx::query_as(
        "SELECT can_promote_user($1, $2)"
    )
    .bind(current_user.id)
    .bind(params.target_user_id)
    .fetch_one(pool.get_ref())
    .await
    .map_err(|e| actix_web::error::ErrorInternalServerError(e))?;

    if !can_promote {
        return Ok(HttpResponse::Forbidden().json(ApiResponse { ok: false }));
    }

    // Use the write pool for privileged operations
    sqlx::query("UPDATE users SET role = 'admin' WHERE id = $1")
        .bind(params.target_user_id)
        .execute(pool.get_ref())
        .await
        .map_err(|e| actix_web::error::ErrorInternalServerError(e))?;

    Ok(HttpResponse::Ok().json(ApiResponse { ok: true }))
}

3. Parameterized queries and strict input validation

Avoid dynamic SQL concatenation. Use SQLx macros or query-as with strict types.

// src/services/user.rs
use sqlx::postgres::types::PgRole;
use sqlx::PgPool;

pub async fn set_user_role(pool: &PgPool, user_id: i64, role: &str) -> sqlx::Result<()> {
    // Validate role against an allowlist; do not interpolate
    let valid = ["user", "moderator", "admin"];
    if !valid.contains(&role) {
        return Err(sqlx::error::Error::DecodeError(
            "invalid role".into(),
            Box::new(std::io::Error::new(std::io::ErrorKind::InvalidInput, "bad role"))
        ));
    }

    sqlx::query!(r#"
        UPDATE users
        SET role = $1
        WHERE id = $2
    "#, role, user_id)
    .execute(pool)
    .await?;
    Ok(())
}

4. Leverage CockroachDB features cautiously

If you rely on CockroachDB’s PostgreSQL compatibility, prefer standard SQL constructs over database-side superuser operations from web handlers. Avoid granting the web pool CREATEROLE or SUPERUSER. Instead, implement application-level permissions and use separate migration jobs with higher-privilege credentials.

These steps reduce the blast radius if an IDOR or BOLA flaw is discovered, ensuring that Actix endpoints backed by CockroachDB operate with least privilege.