Auth Bypass in Fiber with Cockroachdb

Auth bypass in a Fiber service that uses Cockroachdb as the primary data store often stems from incomplete authorization checks and overly permissive session or token validation. When authentication is present but authorization is missing or inconsistent, an authenticated user can manipulate identifiers to access other users' data. This is a classic Broken Object Level Authorization (BOLA) / Insecure Direct Object Reference (IDOR) pattern in the context of a Fiber API backed by Cockroachdb.

Consider a typical endpoint pattern where the user ID is supplied in a URL parameter without server-side ownership verification:

app.Get("/users/:userID/profile", func(c *fiber.Ctx) error {
    userID := c.Params("userID")
    var profile Profile
    // Potential BOLA: no check that the requesting user owns this userID
    if err := db.Get(&profile, "SELECT * FROM profiles WHERE id = $1", userID); err != nil {
        return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "not found"})
    }
    return c.JSON(profile)
})

An attacker can change :userID to any valid UUID or integer and retrieve other users' profiles if the database returns rows and the application trusts the parameter. With Cockroachdb, this risk is amplified in distributed setups where secondary indexes and multi-region configurations may inadvertently expose data if authorization is not enforced consistently across nodes.

Another variant involves role or permission checks that are incomplete. For example, an endpoint might verify that a user exists but fail to confirm that the user has the required role to perform an action:

app.Delete("/api/admin/settings/:settingID", func(c *fiber.Ctx) error {
    user, ok := c.Locals("user").(*User)
    if !ok {
        return c.SendStatus(fiber.StatusUnauthorized)
    }
    // Missing check: user must be an admin for this operation
    var setting Setting
    if err := db.Get(&setting, "SELECT * FROM settings WHERE id = $1", c.Params("settingID")); err != nil {
        return c.SendStatus(fiber.StatusNotFound)
    }
    // Perform deletion/update without verifying admin role
    return c.SendStatus(fiber.StatusNoContent)
})

In this scenario, any authenticated user who guesses or enumerates settingID can invoke the endpoint. Because Cockroachdb enforces SQL semantics consistently, a missing WHERE clause or incorrect row-level filter leads to direct data manipulation. The scanner checks for such authorization gaps under BOLA/IDOR and flags missing ownership or role validation as a high-severity finding.

Additionally, authentication mechanisms can be misconfigured in ways that bypass proper session or token validation. If tokens are accepted without verifying scope or audience, or if session cookies lack proper path and domain restrictions, a user may be able to reuse a token across routes where authorization is not rechecked. The LLM/AI security checks also ensure that prompts or system messages exposing authentication logic are not leaked through model outputs, which could aid an attacker in crafting auth bypass attempts.

Remediation centers on enforcing ownership and role checks explicitly in every data access path and using parameterized queries to avoid injection that could undermine authorization. Below are concrete, secure patterns for Fiber with Cockroachdb.

1. Enforce ownership with the requesting user ID

Always bind the authenticated user identity to the data query. Do not trust client-supplied identifiers alone.

app.Get("/users/:userID/profile", func(c *fiber.Ctx) error {
    user, ok := c.Locals("user").(*User)
    if !ok {
        return c.SendStatus(fiber.StatusUnauthorized)
    }
    requestedID := c.Params("userID")
    if user.ID != requestedID {
        return c.SendStatus(fiber.StatusForbidden)
    }
    var profile Profile
    if err := db.Get(&profile, "SELECT * FROM profiles WHERE id = $1 AND owner_id = $2", requestedID, user.ID); err != nil {
        return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "not found"})
    }
    return c.JSON(profile)
})

The query includes both the requested ID and the authenticated user ID, ensuring that even if an attacker changes :userID, Cockroachdb will return no rows unless the ownership matches.

2. Verify roles or scopes before sensitive operations

For admin or privileged endpoints, validate roles server-side on every request.

app.Delete("/api/admin/settings/:settingID", func(c *fiber.Ctx) error {
    user, ok := c.Locals("user").(*User)
    if !ok || user.Role != "admin" {
        return c.SendStatus(fiber.StatusForbidden)
    }
    settingID := c.Params("settingID")
    result, err := db.Exec("DELETE FROM settings WHERE id = $1 AND (owner_id = $2 OR role = 'admin')", settingID, user.ID)
    if err != nil {
        return c.SendStatus(fiber.StatusInternalServerError)
    }
    rowsAffected, _ := result.RowsAffected()
    if rowsAffected == 0 {
        return c.SendStatus(fiber.StatusForbidden)
    }
    return c.SendStatus(fiber.StatusNoContent)
})

This ensures that authorization is rechecked at the data layer and not solely at the application gateway. Using Cockroachdb’s SQL semantics, the WHERE clause incorporates role-based conditions to prevent unauthorized deletes.

3. Use parameterized queries and avoid string concatenation

Never build SQL by string interpolation to prevent injection that can be leveraged to bypass authorization logic.

// Safe: parameterized query
var count int
err := db.Get(&count, "SELECT COUNT(*) FROM shared_access WHERE resource_id = $1 AND accessor_id = $2", resourceID, userID)
if err != nil {
    return c.SendStatus(fiber.StatusInternalServerError)
}
if count == 0 {
    return c.SendStatus(fiber.StatusForbidden)
}

By binding parameters, you ensure that identifiers are treated as values, not executable SQL, preserving the integrity of your authorization checks.

4. Consistent session/token validation

Ensure tokens are validated for correct scope and audience on each request, and avoid accepting unsigned or weakly signed tokens. Enforce secure, HttpOnly cookies with proper domain/path settings for web clients.

middleBrick’s Auth Bypass and BOLA/IDOR checks will surface these classes of issues, while the LLM/AI Security probes verify that no authentication logic is inadvertently exposed through model endpoints.