Microsoft 365 Apps for Enterprise for 32-bit Systems.Microsoft Office 2019 for 32-bit editions.Microsoft Outlook 2013 Service Pack 1 (64-bit editions).Microsoft Outlook 2013 RT Service Pack 1. ![]() Microsoft Outlook 2013 Service Pack 1 (32-bit editions).Microsoft Outlook 2016 (64-bit edition). ![]() As per the Microsoft blog other versions of Microsoft Outlook such as Android, iOS, Mac, as well as Outlook on the web and other M365 services are not affected This impacts all versions of Microsoft Outlook for Windows. The attacker can then use this connection's NTLM negotiation message and relay this authentication against other systems that support NTLM authentication.Īccording to Microsoft “An attacker who successfully exploited this vulnerability could access a user's Net-NTLMv2 hash which could be used as a basis of an NTLM Relay attack against another service to authenticate as the user” There is no user interaction required to trigger this vulnerability. Once Outlook receives this message it initiates a NTLM authentication with this SMB share server. ![]() ![]() This vulnerability targets Microsoft Outlook and allows NTLM credentials theft which could be used for privilege escalation attacks.Īn attacker can send an email to the victim with an extended MAPI (Microsoft Outlook Messaging API) property with a UNC (Universal Naming Convention - A string format that specifies the location of a resource) path to an attacker-controlled SMB (TCP 445) share. On 14th March 2023, Microsoft released a security update guide for a critical severity vulnerability CVE-2023-23397.
0 Comments
Leave a Reply. |