The user should confirm the password they set by writing it twice.In order to secure this step, the measures that should be taken are: Once the user has proved their identity by providing the token (sent via an email) or code (sent via SMS or other mechanisms), they should reset their password to a new secure one. Employ normal security measures, such as SQL Injection Prevention methods and Input Validation.Otherwise an attacker could make thousands of password reset requests per hour for a given account, flooding the user's intake system (e.g., email inbox or SMS) with useless requests. Implement protections against excessive automated submissions such as rate-limiting on a per-account basis, requiring a CAPTCHA, or other controls.This could be achieved by using asynchronous calls or by making sure that the same logic is followed, instead of using a quick exit method. Ensure that responses return in a consistent amount of time to prevent an attacker enumerating which accounts exist.When a user uses the forgot password service and inputs their username or email, the below should be followed to implement a secure process: The password reset process can be broken into two main steps, detailed in the following sections. For guidance on resetting multifactor authentication (MFA), see the relevant section in the Multifactor Authentication Cheat Sheet. This cheat sheet is focused on resetting users passwords. Do not make a change to the account until a valid token is presented, such as locking out the account.Single use and expire after an appropriate period.Sufficiently long to protect against brute-force attacks.Randomly generated using a cryptographically safe algorithm.Ensure that generated tokens or codes are:.Use URL tokens for the simplest and fastest implementation.Use a side-channel to communicate the method to reset their password.Ensure that the time taken for the user response message is uniform.Return a consistent message for both existent and non-existent accounts.The following short guidelines can be used as a quick reference to protect the forgot password service: In order to implement a proper user management system, systems integrate a Forgot Password service that allows the user to request a password reset.Įven though this functionality looks straightforward and easy to implement, it is a common source of vulnerabilities, such as the renowned user enumeration attack.
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