Lack of protection against brute force attacks - Credentials
Need
Implementation of strong authentication mechanisms to prevent brute force attacks on promotional codes.
Context
- Usage of Scala for building scalable and high-performance applications
- Usage of play.api.mvc for handling HTTP requests and responses in Play Framework
- Usage of Scala's global execution context for managing concurrent and asynchronous operations
Description
Non compliant code
import play.api.mvc._
import scala.concurrent.ExecutionContext.Implicits.global
class PromoCodeController @Inject()(cc: ControllerComponents) extends AbstractController(cc) {
def validatePromoCode(promoCode: String) = Action.async { implicit request: Request[AnyContent] =>
// Assume we have a method that checks if the promo code is valid
if (isPromoCodeValid(promoCode)) {
Future.successful(Ok("Promo code is valid."))
} else {
Future.successful(BadRequest("Invalid promo code."))
}
}
def isPromoCodeValid(promoCode: String): Boolean = {
// Check the promo code against the database
// This is a placeholder for the actual implementation
false
}
}
This Scala code using the Play framework presents a web server with an endpoint to validate promotional codes. The validatePromoCode
method in the PromoCodeController
class takes a promotional code as input and checks if it is valid using the isPromoCodeValid
method.
The vulnerability lies in the fact that there is no protection against brute force attacks. An attacker can potentially make an unlimited number of requests to the validatePromoCode
endpoint with different promotional codes until they find a valid one.
There are no mechanisms in place to limit the number of requests a client can make in a certain time period. This lack of rate limiting makes the application susceptible to automated attacks, where an attacker uses a script to generate and try a large number of promotional codes.
Additionally, there are no mechanisms in place to monitor and alert on suspicious activity, such as a large number of failed validation attempts in a short period of time, which could indicate a brute force attack.
Steps
- Implement rate limiting to limit the number of requests per IP address or user.
- Implement account lockout mechanism to temporarily lock an account after multiple failed login attempts.
- Implement CAPTCHA or reCAPTCHA to differentiate between human and automated requests.
- Implement strong and complex promo code generation algorithm to make it difficult to guess valid promo codes.
- Implement logging and monitoring to detect and respond to brute force attacks.
- Regularly update and patch the application and its dependencies to fix any security vulnerabilities.
Compliant code
import play.api.mvc._
import scala.concurrent.ExecutionContext.Implicits.global
import play.filters.headers.SecurityHeadersFilter
import play.api.mvc.Security.AuthenticatedBuilder
import play.api.mvc.Security.AuthenticatedRequest
class PromoCodeController @Inject()(cc: ControllerComponents, rateLimiter: RateLimiter) extends AbstractController(cc) {
def validatePromoCode(promoCode: String) = Action.async { implicit request: Request[AnyContent] =>
// Check if the IP address has exceeded the rate limit
if (rateLimiter.isRateLimitExceeded(request.remoteAddress)) {
Future.successful(TooManyRequest("Too many requests. Please try again later."))
} else {
// Assume we have a method that checks if the promo code is valid
if (isPromoCodeValid(promoCode)) {
Future.successful(Ok("Promo code is valid."))
} else {
Future.successful(BadRequest("Invalid promo code."))
}
}
}
def isPromoCodeValid(promoCode: String): Boolean = {
// Check the promo code against the database
// This is a placeholder for the actual implementation
false
}
}
The updated code includes a rate limiter to protect against brute force attacks. The rate limiter checks if the IP address has exceeded the maximum number of requests allowed within a certain time period. If the rate limit is exceeded, the server responds with a TooManyRequest
status code and a message asking the user to try again later.
This solution also assumes the existence of a RateLimiter
class or service that provides the isRateLimitExceeded
method. This service should be implemented to track the number of requests from each IP address and determine if the rate limit has been exceeded.
Please note that this is a basic implementation and may need to be adjusted based on your specific requirements and environment. For example, you might want to implement more sophisticated rate limiting strategies, such as gradually reducing the rate limit for IP addresses that repeatedly exceed the limit.
In addition to rate limiting, other measures should be taken to protect against brute force attacks, such as implementing CAPTCHA or reCAPTCHA, using strong and complex promo code generation algorithms, and regularly updating and patching the application and its dependencies.