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Azure Security Defaults

Managing security can be difficult with common identity-related attacks like password spray, replay, and phishing becoming more and more popular. Security defaults make it easier to help protect your organization from these attacks with preconfigured security settings:

  • Requiring all users to register for Azure Multi-Factor Authentication.

  • Requiring administrators to perform multi-factor authentication.

  • Blocking legacy authentication protocols.

  • Requiring users to perform multi-factor authentication when necessary.

  • Protecting privileged activities like access to the Azure portal.



Availability


Microsoft is making security defaults available to everyone. The goal is to ensure that all organizations have a basic level of security enabled at no extra cost. You turn on security defaults in the Azure portal. If your tenant was created on or after October 22, 2019, it is possible security defaults are already enabled in your tenant. In an effort to protect all of our users, security defaults is being rolled out to all new tenants created.


Who's it for?

  • If you are an organization that wants to increase your security posture but you don't know how or where to start, security defaults are for you.

  • If you are an organization utilizing the free tier of Azure Active Directory licensing, security defaults are for you.

Who should use Conditional Access?

  • If you are an organization currently using Conditional Access policies to bring signals together, to make decisions, and enforce organizational policies, security defaults are probably not right for you.

  • If you are an organization with Azure Active Directory Premium licenses, security defaults are probably not right for you.

  • If your organization has complex security requirements you should consider Conditional Access.

Policies enforced


Unified Multi-Factor Authentication registration


All users in your tenant must register for multi-factor authentication (MFA) in the form of the Azure Multi-Factor Authentication. Users have 14 days to register for Azure Multi-Factor Authentication by using the Microsoft Authenticator app. After the 14 days have passed, the user won't be able to sign in until registration is completed. A user's 14-day period begins after their first successful interactive sign-in after enabling security defaults.


Protecting administrators


Users with privileged access have increased access to your environment. Due to the power these accounts have, you should treat them with special care. One common method to improve the protection of privileged accounts is to require a stronger form of account verification for sign-in. In Azure AD, you can get a stronger account verification by requiring multi-factor authentication.

After registration with Azure Multi-Factor Authentication is finished, the following nine Azure AD administrator roles will be required to perform additional authentication every time they sign in:

  • Global administrator

  • SharePoint administrator

  • Exchange administrator

  • Conditional Access administrator

  • Security administrator

  • Helpdesk administrator

  • Billing administrator

  • User administrator

  • Authentication administrator

Protecting all users


We tend to think that administrator accounts are the only accounts that need extra layers of authentication. Administrators have broad access to sensitive information and can make changes to subscription-wide settings. But attackers frequently target end users.

After these attackers gain access, they can request access to privileged information on behalf of the original account holder. They can even download the entire directory to perform a phishing attack on your whole organization.

One common method to improve protection for all users is to require a stronger form of account verification, such as Multi-Factor Authentication, for everyone. After users complete Multi-Factor Authentication registration, they'll be prompted for additional authentication whenever necessary. This functionality protects all applications registered with Azure AD including SaaS applications.


Blocking legacy authentication


To give your users easy access to your cloud apps, Azure AD supports a variety of authentication protocols, including legacy authentication. Legacy authentication is a term that refers to an authentication request made by:

  • Clients that don't use modern authentication (for example, an Office 2010 client).

  • Any client that uses older mail protocols such as IMAP, SMTP, or POP3.

Today, the majority of compromising sign-in attempts come from legacy authentication. Legacy authentication does not support Multi-Factor Authentication. Even if you have a Multi-Factor Authentication policy enabled on your directory, an attacker can authenticate by using an older protocol and bypass Multi-Factor Authentication.

After security defaults are enabled in your tenant, all authentication requests made by an older protocol will be blocked. Security defaults blocks Exchange Active Sync basic authentication.

Warning Before you enable security defaults, make sure your administrators aren't using older authentication protocols. For more information, see How to move away from legacy authentication.

  • How to set up a multifunction device or application to send email using Microsoft 365

Protecting privileged actions

Organizations use a variety of Azure services managed through the Azure Resource Manager API, including:

  • Azure portal

  • Azure PowerShell

  • Azure CLI

Using Azure Resource Manager to manage your services is a highly privileged action. Azure Resource Manager can alter tenant-wide configurations, such as service settings and subscription billing. Single-factor authentication is vulnerable to a variety of attacks like phishing and password spray.

It's important to verify the identity of users who want to access Azure Resource Manager and update configurations. You verify their identity by requiring additional authentication before you allow access.

After you enable security defaults in your tenant, any user who's accessing the Azure portal, Azure PowerShell, or the Azure CLI will need to complete additional authentication. This policy applies to all users who are accessing Azure Resource Manager, whether they're an administrator or a user.


Note Pre-2017 Exchange Online tenants have modern authentication disabled by default. In order to avoid the possibility of a login loop while authenticating through these tenants, you must enable modern authentication.


Note The Azure AD Connect synchronization account is excluded from security defaults and will not be prompted to register for or perform multi-factor authentication. Organizations should not be using this account for other purposes.


Deployment considerations


The following additional considerations are related to deployment of security defaults.


Authentication methods





Disabled MFA status


If your organization is a previous user of per-user based Azure Multi-Factor Authentication, do not be alarmed to not see users in an Enabled or Enforced status if you look at the Multi-Factor Auth status page. Disabled is the appropriate status for users who are using security defaults or Conditional Access based Azure Multi-Factor Authentication.


Conditional Access


You can use Conditional Access to configure policies similar to security defaults, but with more granularity including user exclusions, which are not available in security defaults. If you're using Conditional Access and have Conditional Access policies enabled in your environment, security defaults won't be available to you. If you have a license that provides Conditional Access but don't have any Conditional Access policies enabled in your environment, you are welcome to use security defaults until you enable Conditional Access policies. More information about Azure AD licensing can be found on the Azure AD pricing page.


Here are step-by-step guides on how you can use Conditional Access to configure equivalent policies to those policies enabled by security defaults:

  • Require MFA for administrators

  • Require MFA for Azure management

  • Block legacy authentication

  • Require MFA for all users

  • Require Azure MFA registration - Requires Azure AD Identity Protection part of Azure AD Premium P2.

Enabling security defaults

To enable security defaults in your directory:

  1. Sign in to the Azure portal as a security administrator, Conditional Access administrator, or global administrator.

  2. Browse to Azure Active Directory > Properties.

  3. Select Manage security defaults.

  4. Set the Enable security defaults toggle to Yes.

  5. Select Save.

Disabling security defaults

Organizations that choose to implement Conditional Access policies that replace security defaults must disable security defaults.


To disable security defaults in your directory:

  1. Sign in to the Azure portal as a security administrator, Conditional Access administrator, or global administrator.

  2. Browse to Azure Active Directory > Properties.

  3. Select Manage security defaults.

  4. Set the Enable security defaults toggle to No.

  5. Select Save.

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