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 1. Blog Home
 2. Avanan Customers Protected Against Novel Attack On Microsoft 365
    (CVE-2023-23397)


AVANAN CUSTOMERS PROTECTED AGAINST NOVEL ATTACK ON MICROSOFT 365
(CVE-2023-23397)

 * Posted by Jeremy Fuchs on March 22, 2023
   
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Avanan customers are protected against a new vulnerability, CVE-2023-23397.

This vulnerability, which made headlines last week, is blocked by our SmartPhish
product and all customers are protected. 

The attack works like this:

Hackers can send malicious messages to end-users designed to steal NTLM
authentication hashes. This can be an email, a task or a calendar invite.  This
comes with a reminder attribute, which instructs Outlook on how to alert the
user about the upcoming event. This attribute has the option to use a custom
audio file, and the downloading of this file can expose the user's NTLM hashes.
As soon as this message is received by the victim, the vulnerability is
triggered and the NTLM hashes are returned to the sender.

This process happens as soon as Outlook processes the email. No action by the
end user is required.

As soon as the email shows as delivered in Outlook, it’s game over. Your user’s
credentials have been harvested.

This attack is specifically designed to bypass Microsoft and Microsoft alone. It
underscores the critical importance of a two-layer approach. Since it bypasses
Microsoft, having another service behind it is critical. This is not meant to
criticize Microsoft--it is the most popular, therefore most attacked platform in
the world, and hackers will spend their days (and nights) figuring out how to
bypass it. That is why we recommend to customers that having an additional
security layer from another vendor keeps the organization safer.

 

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