Instead, the majority of password spray attacks submit only a small number of the known weakest passwords against each of the accounts in an enterprise. This behavior would increase the likelihood of detection, either via account lockout or other means. Most password spray attacks don't attempt to attack any given individual account more than a few times. Tutorial: Configure custom banned passwords Password spray attacks and third-party compromised password listsĪzure AD Password Protection helps you defend against password spray attacks. To get started with using a custom banned password list, complete the following tutorial: The password validation algorithm then automatically blocks weak variants and combinations. Instead, it's much more efficient and secure to block only the key base terms, such as the following examples: For this example customer, it would be wasteful and less secure to try to block specific variations of these terms such as the following: The company is based in London and makes a product named Widget. This approach lets you efficiently detect and block large numbers of weak passwords and their variants. To fully leverage the benefits of the custom banned password list, first understand how are passwords evaluated before you add terms to the custom banned list. It's not designed for blocking extremely large lists of passwords. The custom banned password list is limited to a maximum of 1000 terms. This global banned password list is applied to users when they change or reset their own password through Azure AD. There's nothing to enable or configure, and can't be disabled. The global banned password list is automatically applied to all users in an Azure AD tenant. This validation check results in stronger passwords for all Azure AD customers. When a password is changed or reset for any user in an Azure AD tenant, the current version of the global banned password list is used to validate the strength of the password. The contents of the global banned password list aren't based on any external data source, but on the results of Azure AD security telemetry and analysis. When weak terms are found, they're added to the global banned password list. Specifically, the analysis looks for base terms that often are used as the basis for weak passwords. The Azure AD Identity Protection team constantly analyzes Azure AD security telemetry data looking for commonly used weak or compromised passwords. If your IT team hasn't enabled the ability to reset your own password, reach out to your helpdesk for additional assistance. If you're an end user already registered for self-service password reset and need to get back into your account, go to. This conceptual article explains to an administrator how Azure AD Password Protection works. For more information on using multiple layers of security for your sign-in events, see Your Pa$$word doesn't matter. You should use additional features like Azure AD Multi-Factor Authentication, not just rely on strong passwords enforced by Azure AD Password Protection. When users change or reset their passwords, these banned password lists are checked to enforce the use of strong passwords. To support your own business and security needs, you can define entries in a custom banned password list. With Azure AD Password Protection, default global banned password lists are automatically applied to all users in an Azure AD tenant. Azure AD Password Protection detects and blocks known weak passwords and their variants, and can also block additional weak terms that are specific to your organization. You can provide your users with guidance on how to choose passwords, but weak or insecure passwords are often still used. A lot of security guidance recommends that you don't use the same password in multiple places, to make it complex, and to avoid simple passwords like Password123.
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