Privilege Escalation in Echo Go with Api Keys

In Echo Go, privilege escalation via API keys commonly occurs when key values are used directly in routing or authorization logic without proper scope or ownership checks. An attacker who discovers or guesses a valid API key may leverage it to call administrative endpoints that should be restricted to higher-privilege roles. Because Echo Go applications often bind key identifiers to user contexts (e.g., tenant or org ID), missing authorization checks allow horizontal or vertical escalation: a key issued for read-only data access can be reused to modify resources or invoke admin functions if endpoint-level protections are absent.

This risk is amplified when API keys are long-lived, embedded in client-side code, or logged inadvertently. The unauthenticated scan capability of middleBrick exposes these issues by testing endpoints that accept API keys without verifying whether the caller’s scope aligns with the action’s required privileges. Findings may map to OWASP API Top 10 Broken Object Level Authorization (BOLA) and Privilege Escalation, as well as SOC 2 and GDPR controls around access management. For example, an endpoint like PUT /orgs/{orgID}/billing might accept an API key in an X-API-Key header, but if the handler only checks key validity and not whether the key’s associated org matches orgID or whether the key has billing scope, a low-privilege key can change billing settings for any org.

middleBrick’s BFLA/Privilege Escalation checks run parallel to other 12 security checks, testing whether authenticated calls with one key can influence or access resources assigned to another key. When combined with OpenAPI/Swagger spec analysis (2.0, 3.0, 3.1) with full $ref resolution, middleBrick cross-references spec definitions with runtime behavior to highlight mismatches between declared scopes and actual enforcement. This helps identify cases where documentation claims key-level scoping but implementation lacks per-request authorization, enabling attackers to exploit trust in the key alone.

Remediation centers on strict key-to-scope binding and consistent authorization checks on every endpoint. Store keys with metadata such as associated org ID, allowed scopes, and expiry, and validate these attributes on each request. Avoid using keys as mere authentication tokens without enforcing authorization based on the subject they represent.

Example of insecure handling in Echo Go:

// Insecure: key is validated but scope/ownership is not checked
func updateBilling(c echo.Context) error {
    apiKey := c.Request().Header.Get("X-API-Key")
    keyRecord, err := store.GetAPIKey(apiKey)
    if err != nil || !keyRecord.IsValid {
        return echo.ErrUnauthorized
    }
    // Missing: ensure keyRecord.Scopes includes "billing:write" and keyRecord.OrgID matches orgID from request
    orgID := c.Param("orgID")
    // Dangerous: key can act on any orgID
    return updateBillingOrg(orgID, c.Request().Body)
}

Secure implementation using scope and org binding:

// Secure: validate scope and org ownership
func updateBilling(c echo.Context) error {
    apiKey := c.Request().Header.Get("X-API-Key")
    keyRecord, err := store.GetAPIKey(apiKey)
    if err != nil || !keyRecord.IsValid {
        return echo.ErrUnauthorized
    }
    orgID := c.Param("orgID")
    // Ensure the key is allowed for this org and has billing write scope
    if keyRecord.OrgID != orgID || !hasScope(keyRecord.Scopes, "billing:write") {
        return echo.ErrForbidden
    }
    return updateBillingOrg(orgID, c.Request().Body)
}

func hasScope(scopes []string, required string) bool {
    for _, s := range scopes {
        if s == required {
            return true
        }
    }
    return false
}

Rotate keys periodically and avoid embedding them in JavaScript or mobile bundles. If you use the middleBrick CLI, you can run middlebrick scan <url> to detect missing scope checks; with the Pro plan, enable continuous monitoring so changes to endpoints or key handling trigger alerts. In CI/CD, the GitHub Action can fail builds when risk scores exceed your threshold, preventing deployment of configurations that would allow privilege escalation via API keys.