Fix Insufficient Logging & Monitoring in Go Fiber
In the world of AppSec, if it isn't logged, it didn't happen. Go Fiber is optimized for performance, but its default configuration is a black hole for telemetry. Attackers exploit this silence to brute-force endpoints, probe for vulnerabilities, and maintain persistence without triggering a single alert. To secure a Fiber application, you must implement structured logging, capture request metadata, and ensure that security-critical events—like authentication failures and 500-series errors—are piped to your monitoring stack.
The Vulnerable Pattern
package mainimport “github.com/gofiber/fiber/v2”
func main() { app := fiber.New()
// VULNERABILITY: No logging middleware, no error recovery, no audit trail. app.Post("/api/v1/login", func(c *fiber.Ctx) error { // If login fails, the server is silent. // An attacker could rotate IPs and brute force undetected. return c.SendStatus(401) }) app.Listen(":3000")
}
The Secure Implementation
The fix addresses the visibility gap by implementing three critical layers. First, the 'logger' middleware provides a continuous audit trail of all traffic, capturing the source IP, HTTP method, and response status. Second, the 'recover' middleware ensures that application panics are caught and can be logged rather than causing a silent service failure. Third, a centralized 'ErrorHandler' is configured to log the raw, technical error details to the server logs while returning a generic, non-descriptive error to the client. This prevents 'Information Exposure' while ensuring the security team has the forensics needed to identify exploitation attempts like SQL injection or path traversal.
package mainimport ( “log” “github.com/gofiber/fiber/v2” “github.com/gofiber/fiber/v2/middleware/logger” “github.com/gofiber/fiber/v2/middleware/recover” )
func main() { // Custom config to prevent sensitive data leakage in response app := fiber.New(fiber.Config{ ErrorHandler: func(ctx *fiber.Ctx, err error) error { code := fiber.StatusInternalServerError if e, ok := err.(*fiber.Error); ok { code = e.Code } // Log the actual error for internal SOC analysis log.Printf(“SEC-ALARM: Request %s failed with error: %v”, ctx.Path(), err) return ctx.Status(code).JSON(fiber.Map{“status”: “error”, “message”: “Internal Server Error”}) }, })
// 1. Recover from panics to log crashes instead of dying silently app.Use(recover.New()) // 2. Structured logging for every request including IP and Latency app.Use(logger.New(logger.Config{ Format: "[${time}] ${status} - ${latency} ${method} ${path} IP:${ips} UA:${ua}\n", })) app.Post("/api/v1/login", func(c *fiber.Ctx) error { // 3. Application-level security logging log.Printf("AUTH_ATTEMPT: User login attempt from IP: %s", c.IP()) return c.Status(401).JSON(fiber.Map{"error": "Unauthorized"}) }) log.Fatal(app.Listen(":3000"))
}
Your Go Fiber API
might be exposed to Insufficient Logging & Monitoring
74% of Go Fiber apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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