Need

Implementation of a strong credential policy, including password complexity, expiration, and secure temporary password generation

Context

Description

// --- Weak credential policy ---
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;

public class WeakCredentialPolicyServlet extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {...

**Weak credential policy:** The above code is an example of a servlet that implements a weak credential policy. The servlet handles POST requests, where it expects to receive a username and password parameter. It then checks if the username is "admin" and the password is "password". If the check passes, it creates a session for the user and redirects the user to a success page. Otherwise, it redirects the user to a failure page. The vulnerability lies in the weak credential policy. The username and password are hardcoded into the application, and the password is a common and easily guessable one, "password". This makes the application susceptible to brute force attacks, where an attacker can try different combinations of usernames and passwords until they find one that works. Furthermore, the application does not implement any form of password complexity requirements or account lockout mechanisms. This means that a user could choose a simple, easily guessable password, and an attacker could make unlimited attempts to guess a user's password. Both of these factors contribute to the weak credential policy. To fix this vulnerability, the application should implement a strong credential policy. This could include requiring complex passwords, implementing account lockout mechanisms after a certain number of failed login attempts, and not hardcoding usernames and passwords into the application. **Password expiration:** This Java code snippet demonstrates the vulnerability of a weak credential policy, specifically the issue of not having a password expiration policy in place for an AWS IAM account. The `AwsIamPolicy` class contains a `main` method which initializes the AWS credentials with `ACCESS_KEY` and `SECRET_KEY`. These credentials are then used to build an `AmazonIdentityManagementClient`. The client then retrieves the account's password policy using the `getAccountPasswordPolicy` method. The result of this method call is an object of `GetAccountPasswordPolicyResult` class which contains the password policy details for the IAM account. Finally, the code prints whether password expiration is enabled or not by calling `getExpirePasswords` on the password policy. If the output of this is `false`, it means that the password expiration is not enabled, which is a security vulnerability. Good security practices suggest that credentials (passwords) should be renewed in 90-day periods. If the password expiration is set to disable, it means that the same password can be used indefinitely, making it susceptible to brute-force and other password-related attacks. **Password strength:** In the above code, we have a servlet `WeakPasswordServlet` that handles the POST request for user registration. It fetches the username and password from the request parameters and checks if the password is valid by calling the `isValidPassword` method. The vulnerability lies in the `isValidPassword` method. This method only checks if the password length is at least 4 characters long. This is a weak credential policy as it does not enforce any complexity requirements for the password such as: - The use of both lowercase and uppercase characters - The use of numeric digits - The use of special characters - A minimum length greater than 4 Such a weak credential policy makes the system susceptible to brute force attacks, where an attacker can systematically check all possible passwords until the correct one is found. The lack of complexity requirements means the total number of possible passwords is significantly reduced, making the brute force attack faster and more likely to succeed. To fix this vulnerability, the `isValidPassword` method should be updated to enforce a strong credential policy. **Temporary passwords:** In the above code, we are setting a temporary password for a user. The `doPost` method is handling a POST request where we get the username from the request parameters. Then, we are setting the temporary password as "password123". This code is vulnerable due to its weak credential policy. The temporary password is not strong enough, it's a common password and can be easily guessed or brute forced by attackers. This can lead to unauthorized access to user accounts. The password is also hardcoded which is a bad practice. If the source code is leaked or accessible, the password is exposed. Moreover, there's no mechanism to force the user to change the temporary password after the first login. This means that if the user does not change this password, the account remains with the weak password indefinitely. This is a serious security vulnerability and can lead to potential data breaches. In a secure system, temporary passwords should be strong, unique, and must be changed after the first login. They should not be hardcoded into the application.

// --- Weak credential policy ---
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
...

**Weak credential policy:** The updated code now includes a strong credential policy. - The `isValidCredentials` method should be implemented to validate the credentials. This should include checking the password against a securely stored and hashed version of the password, checking that the password meets complexity requirements, and including multi-factor authentication. - The `hashPassword` method is used to securely hash the password using SHA-256. This is a one-way function, so the original password cannot be retrieved from the hashed version. - An account lockout mechanism has been implemented. If a user fails to log in `MAX_ATTEMPTS` times, they are redirected to a lockout page. This helps to prevent brute force attacks. - The system should be regularly updated and patched to ensure that it remains secure. This is not shown in the code, but is an important part of maintaining a secure system. **Password expiration:** The updated code now includes a call to `updateAccountPasswordPolicy` with a new `UpdateAccountPasswordPolicyRequest` object. This object is configured to set the password expiration period to 90 days, prevent the reuse of the last 5 passwords, and require at least one symbol, number, uppercase letter, and lowercase letter in the password. This ensures that the AWS IAM policy now has a strong password policy, which includes password expiration. After updating the password policy, the code retrieves the current account password policy and prints whether password expiration is enabled. **Password strength:** The updated code now enforces a stronger password policy. The `isValidPassword` method checks if the password meets the following criteria: - At least 8 characters long - Contains at least one uppercase letter - Contains at least one lowercase letter - Contains at least one digit - Contains at least one special character (e.g., @, #, $, %, ^, &, +, =) - Does not contain whitespace The password pattern is defined using a regular expression (regex). The `Pattern.compile` method compiles the regex into a pattern, and the `Matcher.matches` method checks if the password matches the pattern. This stronger password policy helps protect against brute force attacks by increasing the number of possible combinations, making it harder for an attacker to guess the password. It also helps protect against dictionary attacks by preventing the use of common words and phrases. In addition to implementing a stronger password policy, consider educating users about the importance of strong passwords and providing guidelines for creating them. Also consider implementing multi-factor authentication for added security. **Temporary passwords:** The updated code includes a method to generate a random password with a specified length. The `generateRandomPassword` method uses a `SecureRandom` object to generate a random password. The password includes a combination of lowercase letters, uppercase letters, numbers, and special characters. The `doPost` method now calls `generateRandomPassword` to create a temporary password for the user. This password is more secure than the previous hard-coded password. This code does not include password expiration or measures to prevent brute-force attacks. These features would typically be implemented server-side, not within the servlet itself. The temporary password should be stored securely, such as using strong encryption. This is not shown in the code, as it would typically be handled by the code that sets the user's password. This code also does not include a check for minimum password length. The `generateRandomPassword` method throws an `IllegalArgumentException` if the specified length is less than 1, but you may want to enforce a longer minimum length.

References