Arp Spoofing in Axum with Mysql

Arp spoofing is a Layer 2 attack where an adversary sends falsified ARP messages to associate their MAC address with the IP address of another host, typically the database server. In an Axum application that communicates with a MySQL backend, this creates a man-in-the-middle scenario for database traffic. Axum, a Rust web framework, often runs services that open persistent or pooled TCP connections to MySQL using hostnames or IPs such as 127.0.0.1 or a private network address. If an attacker subverts ARP resolution on the local network (for example, a shared host or container network), they can redirect MySQL responses destined for the Axum service to their own machine. Because the communication may initially rely on unencrypted connections (discussed below), the attacker can observe or tamper with authentication exchanges, queries, and results. MiddleBrick detects this as a data exposure risk when unencrypted database traffic is discoverable on paths subject to ARP manipulation, highlighting that unauthenticated network-layer attacks can expose sensitive data without needing valid credentials.

The Axum service typically connects using a connection string; if TLS is not enforced for the MySQL link, the session remains vulnerable even when ARP spoofing is detected. MiddleBrick’s unauthenticated scan can identify endpoints listening on MySQL ports and flag encryption weaknesses, because intercepted credentials or query results can lead to further compromise. The interplay of network-level vulnerabilities and application-level database access patterns increases the likelihood of successful data interception. Attack patterns like this align with common weaknesses in the OWASP API Top 10 under Security Misconfiguration and Sensitive Data Exposure, where insufficient transport protections intersect with network architecture weaknesses.

Concrete risk examples include capturing database credentials sent in plaintext during initial authentication or intercepting query results containing personally identifiable information. MiddleBrick’s findings in this category include checks for encryption and data exposure, emphasizing that simple network-layer attacks can bypass application controls when transport security is absent. By correlating OpenAPI specifications with runtime behavior, the scanner ensures that both declared and actual endpoint behaviors are evaluated for exposure to such threats.

Securing the Axum-to-MySQL path requires enforcing encrypted connections and reducing reliance on implicit network trust. In Rust, using the sqlx crate with MySQL, you should always enable TLS and validate server certificates. Below is a secure connection example that forces encrypted links and verifies the server identity, mitigating passive sniffing and ARP spoofing attacks:

use sqlx::mysql::MySqlConnectOptions;
use sqlx::ConnectOptions;
use std::time::Duration;

let database_url = "mysql://user:[email protected]:3306/mydb";
let mut options = MySqlConnectOptions::from_str(database_url)?;
// Enforce TLS and require a valid server certificate
options.force_ssl_mode(sqlx::mysql::SslMode::Required)
       .connect_timeout(Duration::from_secs(10));
let pool = sqlx::MySqlPool::connect_with(options).await?;

If you manage TLS certificates explicitly, provide a CA certificate to validate the server:

use sqlx::mysql::MySqlConnectOptions;
use std::path::Path;

let mut options = MySqlConnectOptions::new("mysql", "db.example.com", 3306)
    .database("mydb")
    .username("user")
    .password("password")
    .ssl_mode(sqlx::mysql::SslMode::VerifyCa)
    .ssl_ca_path(Path::new("/path/to/ca.pem"));
let pool = sqlx::MySqlPool::connect_with(options).await?;

Additionally, configure your application and infrastructure to resist ARP spoofing at the network level. Use static ARP entries for critical database hosts in controlled environments or ensure switches implement ARP inspection (DAI). In containerized deployments, prefer host networking or encrypted overlay networks to limit exposure. MiddleBrick’s scans can verify whether your endpoints show encryption requirements and highlight missing configurations. For ongoing assurance, the Pro plan supports continuous monitoring so that changes in encryption posture are tracked alongside configuration drift.

Finally, ensure that Axum routes handling database interactions follow secure coding practices, such as using prepared statements to avoid SQL injection, which can be chained with network vulnerabilities. Combine runtime protections with infrastructure hardening to reduce the attack surface presented by local network attacks.