Fix Improper Assets Management in Go Fiber
Improper Asset Management in Go Fiber typically manifests as Shadow APIs, unmaintained legacy endpoints, or catastrophic directory listing. Insecure configurations of the Static middleware or failing to decommission old API versions creates a massive attack surface. As a researcher, I frequently see developers exposing the project root or sensitive build artifacts by misconfiguring file serving, allowing attackers to leak .env files, source code, or internal documentation.
The Vulnerable Pattern
package mainimport “github.com/gofiber/fiber/v2”
func main() { app := fiber.New()
// VULNERABILITY: Exposing the entire root directory allows access to .git, .env, and source files app.Static("/", "./") // VULNERABILITY: Unmaintained/Legacy endpoint left active without monitoring app.Get("/api/v1/internal-debug-tool", func(c *fiber.Ctx) error { return c.SendString("Sensitive Debug Info") }) app.Listen(":3000")
}
The Secure Implementation
To mitigate Improper Asset Management, you must enforce strict boundary controls. First, never point `app.Static` to the project root; isolate public assets in a dedicated subdirectory (e.g., `./public`) and ensure `Browse: false` is set to prevent directory traversal and file discovery. Second, implement a formal API lifecycle using Fiber's `app.Group`. Use middleware to intercept calls to deprecated versions, returning a `410 Gone` status code. This prevents 'Shadow APIs'—forgotten endpoints that lack modern security headers or authentication checks.
package mainimport “github.com/gofiber/fiber/v2”
func main() { app := fiber.New()
// FIX: Restrict static files to a dedicated public folder and disable directory browsing app.Static("/assets", "./public", fiber.Static{ Compress: true, ByteRange: true, Browse: false, // Prevent directory listing Index: "index.html", }) // FIX: Implement API Versioning and explicitly decommission old assets api := app.Group("/api") v2 := api.Group("/v2") v2.Get("/status", func(c *fiber.Ctx) error { return c.JSON(fiber.Map{"status": "secure"}) }) // Explicitly handle or remove legacy routes api.All("/v1/*", func(c *fiber.Ctx) error { return c.Status(fiber.StatusGone).JSON(fiber.Map{"error": "API version deprecated"}) }) app.Listen(":3000")
}
Your Go Fiber API
might be exposed to Improper Assets Management
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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