![]() Before you can use SMS-based authentication, all users enabled in an SMS-message authentication policy must be assigned one of the following licenses: Users receive a text message that they use to confirm their identity. Now in preview, Azure AD SMS-based authentication lets users sign in using their registered mobile phone number. Organizations can also use Azure AD as the identity provider for their own cloud-based applications. Azure Active Directory (Azure AD) is the identity management platform used by Office 365, Microsoft 365, and of course Azure. For example, users can sign-in using the Microsoft Authenticator app or a FIDO2 security key. RecommendationĪzure AD-joined devices that have the Web sign-in feature enabled through the Authentication CSP, should be updated with the April 2021 Cumulative Update to prevent unauthorized access.Microsoft provides several different ways for users to log in to Azure AD without a username and password. The Web Sign-in feature was introduced with Windows 10, version 1809 and does not affect other supported Operating Systems, like Windows Server 2012 and Windows Server 2016. The following Operating Systems (OSs) are affected: The vulnerability was responsibly disclosed to Microsoft. ![]() It allows an attacker with physical access to the device to gain unauthorized access. ![]() Web Sign-in is only supported on Azure AD Joined PCs.Īn elevation of privilege vulnerability exists in the way Azure Active Directory web sign-in allows arbitrary browsing from the third-party endpoints used for federated authentication. ![]() Web sign-in enables you to set multifactor authentication before signing in to Windows. It enables Windows logon support for non-AD FS federated providers (e.g. Web Sign-in is a new way of signing into a Windows system. This vulnerability is known as CVE-2021-27092 and rated with CVSSv3.0 scores of 6.8/5.9. ![]() Today, for its April 2021 Patch Tuesday, Microsoft released an important security update for the Azure AD web sign-in feature in Windows and Windows Server. ![]()
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