Fix Insufficient Logging & Monitoring in Micronaut
Insufficient logging and monitoring is a silent killer in Micronaut microservices. Attackers exploit this visibility gap to perform credential stuffing, lateral movement, and data exfiltration without triggering a single alert. If your logs don't capture the 'who, what, and when' of security-critical events, you are flying blind during an active breach. Security-focused logging must be structured, immutable, and integrated with real-time telemetry.
The Vulnerable Pattern
@Controller("/auth")
public class LoginController {
@Post("/login")
public HttpResponse login(@Body LoginRequest req) {
// VULNERABILITY: No logging of attempts, source IPs, or failures.
// An attacker could brute-force this endpoint undetected.
if (authService.authenticate(req)) {
return HttpResponse.ok();
}
return HttpResponse.unauthorized();
}
}The Secure Implementation
The secure implementation utilizes SLF4J to log specific security events with context. By capturing the username and the remote IP address, we enable incident responders to trace the origin of an attack. Failed authentication attempts are logged at the WARN level, which should be monitored by a SIEM (like ELK or Splunk) to trigger alerts on threshold breaches. Additionally, Micronaut developers should enable the 'micronaut-management' dependency to expose metrics via Prometheus/Micrometer, allowing for real-time monitoring of 4xx/5xx error spikes that often indicate automated exploitation attempts.
import org.slf4j.Logger; import org.slf4j.LoggerFactory; import io.micronaut.http.HttpRequest;@Controller(“/auth”) public class LoginController { private static final Logger LOG = LoggerFactory.getLogger(LoginController.class);
@Post("/login") public HttpResponse<?> login(@Body LoginRequest req, HttpRequest<?> request) { String remoteAddr = request.getRemoteAddress().getHostString(); if (authService.authenticate(req)) { LOG.info("AUDIT: Successful login for user [{}] from IP [{}]", req.username(), remoteAddr); return HttpResponse.ok(); } else { // SECURITY: Log failures as WARN to trigger SIEM alerts for brute-force patterns LOG.warn("SECURITY ALERT: Failed login attempt for user [{}] from IP [{}]", req.username(), remoteAddr); return HttpResponse.unauthorized(); } }
}
Your Micronaut API
might be exposed to Insufficient Logging & Monitoring
74% of Micronaut apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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