Fix Improper Error Handling in Echo
Echo's default behavior is a goldmine for recon. Returning raw error objects directly to the client leaks database schemas, file paths, and stack traces. To harden the API, you must intercept the error flow, log the telemetry internally, and ship a sanitized, generic response to the end-user.
The Vulnerable Pattern
e := echo.New()
e.GET(“/profile”, func(c echo.Context) error { data, err := db.Query(“SELECT * FROM users WHERE id = ?”, c.QueryParam(“id”)) if err != nil { // CRITICAL: Returns raw driver error (e.g., ‘SQL syntax error in…’) to the attacker return err } return c.JSON(200, data) })
The Secure Implementation
Stop leaking implementation details. The fix involves overriding Echo's `HTTPErrorHandler`. By centralizing error logic, you ensure that raw Go `error` types are logged to your internal monitoring stack while the client receives a strictly controlled JSON schema. Use `echo.HTTPError` only when you explicitly want to pass a message to the frontend; otherwise, default to generic 500 status codes to prevent side-channel information leaks.
e := echo.New()// Custom Global Error Handler e.HTTPErrorHandler = func(err error, c echo.Context) { code := http.StatusInternalServerError msg := “An unexpected error occurred”
if he, ok := err.(*echo.HTTPError); ok { code = he.Code msg = fmt.Sprintf("%v", he.Message) } // Log the actual error for internal debugging/SOC c.Logger().Error(err) // Send sanitized JSON to the client if !c.Response().Committed { c.JSON(code, map[string]string{"error": msg}) }}
e.GET(“/profile”, func(c echo.Context) error { _, err := db.Query(”…”) if err != nil { // Wrap internal errors; the handler will mask the details return echo.NewHTTPError(http.StatusInternalServerError, “Internal Server Error”) } return nil })
Your Echo API
might be exposed to Improper Error Handling
74% of Echo apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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