US Government Recommends Office 365 Security Advice including the use of MFA (Multi-Factor Authentication)!

24 May 2019 Internet, IT & e-Discovery Blog Blog
Authors: Peter Vogel

Bleepingcomputer.com reported that the “Cybersecurity and Infrastructure Security Agency (CISA) issued a set of best practices designed to help organizations to mitigate risks and vulnerabilities associated with migrating their email services to Microsoft Office 365.”  The May 13, 2019 report entitled “U.S. Govt Issues Microsoft Office 365 Security Best Practices” included these following examples of Microsoft Office 365 configuration vulnerabilities in its AR19-133A analysis report from CISA:

Multi-factor authentication for administrator accounts not enabled by default: Azure Active Directory (AD) Global Administrators in an O365 environment have the highest level of administrator privileges at the tenant level. Multi-factor authentication (MFA) is not enabled by default for these accounts.

Mailbox auditing disabled: O365 mailbox auditing logs actions that mailbox owners, delegates, and administrators perform. Microsoft did not enable auditing by default in O365 prior to January 2019. Customers who procured their O365 environment before 2019 had to explicitly enable mailbox auditing.

Password sync enabled: Azure AD Connect integrates on-premises environments with Azure AD when customers migrate to O365. If this option is enabled, the password from on-premises overwrites the password in Azure AD. In this particular situation, if the on-premises AD identity is compromised, then an attacker could move laterally to the cloud when the sync occurs. 

Authentication unsupported by legacy protocols: Azure AD is the authentication method that O365 uses to authenticate with Exchange Online, which provides email services. There are a number of protocols associated with Exchange Online authentication that do not support modern authentication methods with MFA features. Taking this step will greatly reduce the attack surface for organizations.

Given the widespread use of Office365 this is critical advice!

 
This blog is made available by Foley & Lardner LLP (“Foley” or “the Firm”) for informational purposes only. It is not meant to convey the Firm’s legal position on behalf of any client, nor is it intended to convey specific legal advice. Any opinions expressed in this article do not necessarily reflect the views of Foley & Lardner LLP, its partners, or its clients. Accordingly, do not act upon this information without seeking counsel from a licensed attorney. This blog is not intended to create, and receipt of it does not constitute, an attorney-client relationship. Communicating with Foley through this website by email, blog post, or otherwise, does not create an attorney-client relationship for any legal matter. Therefore, any communication or material you transmit to Foley through this blog, whether by email, blog post or any other manner, will not be treated as confidential or proprietary. The information on this blog is published “AS IS” and is not guaranteed to be complete, accurate, and or up-to-date. Foley makes no representations or warranties of any kind, express or implied, as to the operation or content of the site. Foley expressly disclaims all other guarantees, warranties, conditions and representations of any kind, either express or implied, whether arising under any statute, law, commercial use or otherwise, including implied warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event shall Foley or any of its partners, officers, employees, agents or affiliates be liable, directly or indirectly, under any theory of law (contract, tort, negligence or otherwise), to you or anyone else, for any claims, losses or damages, direct, indirect special, incidental, punitive or consequential, resulting from or occasioned by the creation, use of or reliance on this site (including information and other content) or any third party websites or the information, resources or material accessed through any such websites. In some jurisdictions, the contents of this blog may be considered Attorney Advertising. If applicable, please note that prior results do not guarantee a similar outcome. Photographs are for dramatization purposes only and may include models. Likenesses do not necessarily imply current client, partnership or employee status.

Authors