![]() ![]() If a User wants to authenticate to M365 to access a service, application or data, the Conditional Access will challenge the End User with an action that needs to be completed. Conditional Access Policies are simple – you set a series of “IF” statements, and then apply “Grant Controls” to dictate how authentication requests are handled. Conditional Access is often used in conjunction with other policies such as User Risk Policies and Device Policies to help determine whether to block or grant an authentication request. Security Defaults is an easy and free way to ensure that Basic Authentication attempts are blocked and End Users are signing into both M365 services and data in a more secure fashion.Īzure AD Conditional Access Policies introduces the highest level of secure identity, while providing the most amount of flexibility and configurability for authentication to you M365 tenant. In addition, with the basic Azure AD plans, using Security Defaults removes the ability to support SMS sign-in, which is only available via Conditional Access Policies or with Legacy MFA. But with this ease of management comes with some limitations, such as not being able to configure MFA locations, session controls, application restrictions and many other configurations that make Modern Authentication based MFA more convenient for End Users. With Security Defaults enabled, all authentication attempts must be made with MFA. It requires Modern Authentication for all Users in a tenant and disallows the use of Basic Authentication. Security Defaults remove the pain of managing MFA on a per individual User basis as seen with Legacy MFA. ![]() Security Defaults are Microsoft’s current standard for bare minimum-security configuration of an M365 tenant, with Security Defaults being enabled with all net-new tenants after October 2019. ![]() Require MFA for all administrators, controlling actions to administrator portals such as Microsoft 365 and Azure, and accessing PowerShell as well as Azure CLI.This will impact older clients and applications that traditionally rely on Basic Authentication.Block all Basic Authentication such as IMAP, POP3, SMTP, and other clients that do not use Modern Authentication.Implements MFA for all Users, including privileged accounts such as Global Administrators as well as End Users.Security Defaults applies the following configuration changes to your tenant: The focus of Security Defaults is to change the behavior of End User sign-in and completely do away with Basic Authentication in favor of Microsoft’s Modern Authentication. Security Defaults are the most practical and easiest approach to implement MFA for End User sign in for many small and midsize organizations. However, outside of testing scenarios, don’t rely on Legacy MFA to be your silver bullet for securing your M365 tenant. Using Legacy MFA is great for testing Azure AD MFA, the registration process and sign in experience. Plain and simple, having Basic Authentication enabled puts your tenant at risk. With Legacy MFA, your tenant is still open to attacks and exploits, since Basic Authentication is still available. But don’t let that fool you – Legacy MFA is the least secure approach to implementing MFA for M365. This simple “ on/off switch” can enforce strong authentication for your End Users quickly and easily. Legacy MFA is probably one of the most common ways to deploy MFA to your User base. When considering deployment of MFA for your End Users, there are three main approaches to consider: Legacy MFA, Security Defaults and Conditional Access Policies. To achieve a more robust identity strategy, most organizations today leverage Multi-Factor Authentication (“ MFA”) for securing User sign-in. ![]() It requires just one authentication factor – password – which can be easily compromised. This approach is also known as Basic Authentication. Until recently, submitting a username and password was considered the standard and secure approach for User sign-ins. In the world of Microsoft 365, there are many ways to accomplish Security & Compliance goals for an organization. ![]()
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