If you're on 2019 or later, the patches are provided through the click-and-run update CDN.įor 2016 and older, patches are provided through windows update and are available from the CVE page. This will prevent the sending of NTLM authentication messages to remote file shares. NOTE: this may cause impact to applications that require NTLM.īlock TCP 445/SMB outbound form your network by using a Firewall and via your VPN settings. For more information, see the following frequently asked questions. To download and install Office 2019, see Download and install or reinstall Microsoft 365 or Office 2019 on a PC or Mac. It includes significant improvements over Microsoft Office 2016 and earlier versions of on-premises Office. It includes the 2019 versions of Word, Excel, PowerPoint and Outlook, plus youll also receive 60 days of Microsoft support. This prevents the use of NTLM as an authentication mechanism. Office 2019 is the next perpetual release of Office. This should be patched in the latest release but if needed, the following workarounds are available:Īdd users to the Protected Users Security Group.
The connection to the remote SMB-server sends the user's NTLM negotiation message, which will leak the NTLM hash of the victim to the attacker who can then relay this for authentication against other systems as the victim.
The exploitation can be triggered as soon as the client receives the email. If you use a Microsoft service like, OneDrive, Xbox Live, or Skype, you already have an account. With CVE-2023-23397, the attacker sends a message with an extended MAPI-property with a UNC-path to a SMB-share on the attacker-controlled server. 1 Sign in with your Microsoft account Youll use your Microsoft account for everything you do with Microsoft 365 or Office.
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